Merge branch 'master' into online-accounts-mempow-v2

# Conflicts:
#	src/main/resources/blockchain.json

WindowsInstaller/Qortal.aip

@@ -17,10 +17,10 @@
     <ROW Property="Manufacturer" Value="Qortal"/>
     <ROW Property="MsiLogging" MultiBuildValue="DefaultBuild:vp"/>
     <ROW Property="NTP_GOOD" Value="false"/>
-    <ROW Property="ProductCode" Value="1033:{B786B6C1-86FA-4917-BAF9-7C9D10959D66} 1049:{60881A63-53FC-4DBE-AF3B-0568F55D2150} 2052:{108D1268-8111-49B9-B768-CC0A0A0CEDE1} 2057:{46DB692E-D942-40D5-B32E-FB94458478BF} " Type="16"/>
+    <ROW Property="ProductCode" Value="1033:{E5597539-098E-4BA6-99DF-4D22018BC0D3} 1049:{2B5E55A2-142A-4BED-B3B9-5657162282B7} 2052:{6F19171F-4743-4127-B191-AAFA3FA885D2} 2057:{A1B3108D-EC5D-47A1-AEE4-DBD956E682FB} " Type="16"/>
     <ROW Property="ProductLanguage" Value="2057"/>
     <ROW Property="ProductName" Value="Qortal"/>
-    <ROW Property="ProductVersion" Value="3.4.0" Type="32"/>
+    <ROW Property="ProductVersion" Value="3.4.3" Type="32"/>
     <ROW Property="RECONFIG_NTP" Value="true"/>
     <ROW Property="REMOVE_BLOCKCHAIN" Value="YES" Type="4"/>
     <ROW Property="REPAIR_BLOCKCHAIN" Value="YES" Type="4"/>
@@ -212,7 +212,7 @@
     <ROW Component="ADDITIONAL_LICENSE_INFO_71" ComponentId="{12A3ADBE-BB7A-496C-8869-410681E6232F}" Directory_="jdk.zipfs_Dir" Attributes="0" KeyPath="ADDITIONAL_LICENSE_INFO_71" Type="0"/>
     <ROW Component="ADDITIONAL_LICENSE_INFO_8" ComponentId="{D53AD95E-CF96-4999-80FC-5812277A7456}" Directory_="java.naming_Dir" Attributes="0" KeyPath="ADDITIONAL_LICENSE_INFO_8" Type="0"/>
     <ROW Component="ADDITIONAL_LICENSE_INFO_9" ComponentId="{6B7EA9B0-5D17-47A8-B78C-FACE86D15E01}" Directory_="java.net.http_Dir" Attributes="0" KeyPath="ADDITIONAL_LICENSE_INFO_9" Type="0"/>
-    <ROW Component="AI_CustomARPName" ComponentId="{D57E945C-0FFB-447C-ADF7-2253CEBF4C0C}" Directory_="APPDIR" Attributes="260" KeyPath="DisplayName" Options="1"/>
+    <ROW Component="AI_CustomARPName" ComponentId="{F17029E8-CCC4-456D-B4AC-1854C81C46B6}" Directory_="APPDIR" Attributes="260" KeyPath="DisplayName" Options="1"/>
     <ROW Component="AI_ExePath" ComponentId="{3644948D-AE0B-41BB-9FAF-A79E70490A08}" Directory_="APPDIR" Attributes="260" KeyPath="AI_ExePath"/>
     <ROW Component="APPDIR" ComponentId="{680DFDDE-3FB4-47A5-8FF5-934F576C6F91}" Directory_="APPDIR" Attributes="0"/>
     <ROW Component="AccessBridgeCallbacks.h" ComponentId="{288055D1-1062-47A3-AA44-5601B4E38AED}" Directory_="bridge_Dir" Attributes="0" KeyPath="AccessBridgeCallbacks.h" Type="0"/>

pom.xml

@@ -3,7 +3,7 @@
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>org.qortal</groupId>
 	<artifactId>qortal</artifactId>
-	<version>3.4.1</version>
+	<version>3.4.3</version>
 	<packaging>jar</packaging>
 	<properties>
 		<skipTests>true</skipTests>

src/main/java/org/qortal/block/Block.java

@@ -199,6 +199,11 @@ public class Block {
 
 		}
 
+		public boolean hasShareBin(AccountLevelShareBin shareBin, int blockHeight) {
+			AccountLevelShareBin ourShareBin = this.getShareBin(blockHeight);
+			return ourShareBin != null && shareBin.id == ourShareBin.id;
+		}
+
 		public long distribute(long accountAmount, Map<String, Long> balanceChanges) {
 			if (this.isRecipientAlsoMinter) {
 				// minter & recipient the same - simpler case
@@ -1215,6 +1220,7 @@ public class Block {
 				}
 			}
 		} catch (DataException e) {
+			LOGGER.info("DataException during transaction validation", e);
 			return ValidationResult.TRANSACTION_INVALID;
 		} finally {
 			// Rollback repository changes made by test-processing transactions above
@@ -1891,12 +1897,67 @@ public class Block {
 		final boolean haveFounders = !onlineFounderAccounts.isEmpty();
 
 		// Determine reward candidates based on account level
-		List<AccountLevelShareBin> accountLevelShareBins = BlockChain.getInstance().getAccountLevelShareBins();
-		for (int binIndex = 0; binIndex < accountLevelShareBins.size(); ++binIndex) {
-			// Find all accounts in share bin. getShareBin() returns null for minter accounts that are also founders, so they are effectively filtered out.
+		// This needs a deep copy, so the shares can be modified when tiers aren't activated yet
+		List<AccountLevelShareBin> accountLevelShareBins = new ArrayList<>();
+		for (AccountLevelShareBin accountLevelShareBin : BlockChain.getInstance().getAccountLevelShareBins()) {
+			accountLevelShareBins.add((AccountLevelShareBin) accountLevelShareBin.clone());
+		}
+
+		Map<Integer, List<ExpandedAccount>> accountsForShareBin = new HashMap<>();
+
+		// We might need to combine some share bins if they haven't reached the minimum number of minters yet
+		for (int binIndex = accountLevelShareBins.size()-1; binIndex >= 0; --binIndex) {
 			AccountLevelShareBin accountLevelShareBin = accountLevelShareBins.get(binIndex);
-			// Object reference compare is OK as all references are read-only from blockchain config.
-			List<ExpandedAccount> binnedAccounts = expandedAccounts.stream().filter(accountInfo -> accountInfo.getShareBin(this.blockData.getHeight()) == accountLevelShareBin).collect(Collectors.toList());
+
+			// Find all accounts in share bin. getShareBin() returns null for minter accounts that are also founders, so they are effectively filtered out.
+			List<ExpandedAccount> binnedAccounts = expandedAccounts.stream().filter(accountInfo -> accountInfo.hasShareBin(accountLevelShareBin, this.blockData.getHeight())).collect(Collectors.toList());
+			// Add any accounts that have been moved down from a higher tier
+			List<ExpandedAccount> existingBinnedAccounts = accountsForShareBin.get(binIndex);
+			if (existingBinnedAccounts != null)
+				binnedAccounts.addAll(existingBinnedAccounts);
+
+			// Logic below may only apply to higher levels, and only for share bins with a specific range of online accounts
+			if (accountLevelShareBin.levels.get(0) < BlockChain.getInstance().getShareBinActivationMinLevel() ||
+					binnedAccounts.isEmpty() || binnedAccounts.size() >= BlockChain.getInstance().getMinAccountsToActivateShareBin()) {
+				// Add all accounts for this share bin to the accountsForShareBin list
+				accountsForShareBin.put(binIndex, binnedAccounts);
+				continue;
+			}
+
+			// Share bin contains more than one, but less than the minimum number of minters. We treat this share bin
+			// as not activated yet. In these cases, the rewards and minters are combined and paid out to the previous
+			// share bin, to prevent a single or handful of accounts receiving the entire rewards for a share bin.
+			//
+			// Example:
+			//
+			// - Share bin for levels 5 and 6 has 100 minters
+			// - Share bin for levels 7 and 8 has 10 minters
+			//
+			// This is below the minimum of 30, so share bins are reconstructed as follows:
+			//
+			// - Share bin for levels 5 and 6 now contains 110 minters
+			// - Share bin for levels 7 and 8 now contains 0 minters
+			// - Share bin for levels 5 and 6 now pays out rewards for levels 5, 6, 7, and 8
+			// - Share bin for levels 7 and 8 pays zero rewards
+			//
+			// This process is iterative, so will combine several tiers if needed.
+
+			// Designate this share bin as empty
+			accountsForShareBin.put(binIndex, new ArrayList<>());
+
+			// Move the accounts originally intended for this share bin to the previous one
+			accountsForShareBin.put(binIndex - 1, binnedAccounts);
+
+			// Move the block reward from this share bin to the previous one
+			AccountLevelShareBin previousShareBin = accountLevelShareBins.get(binIndex - 1);
+			previousShareBin.share += accountLevelShareBin.share;
+			accountLevelShareBin.share = 0L;
+		}
+
+		// Now loop through (potentially modified) share bins and determine the reward candidates
+		for (int binIndex = 0; binIndex < accountLevelShareBins.size(); ++binIndex) {
+			AccountLevelShareBin accountLevelShareBin = accountLevelShareBins.get(binIndex);
+			List<ExpandedAccount> binnedAccounts = accountsForShareBin.get(binIndex);
 
 			// No online accounts in this bin? Skip to next one
 			if (binnedAccounts.isEmpty())
@@ -1914,7 +1975,7 @@ public class Block {
 		// Fetch list of legacy QORA holders who haven't reached their cap of QORT reward.
 		List<EligibleQoraHolderData> qoraHolders = this.repository.getAccountRepository().getEligibleLegacyQoraHolders(isProcessingNotOrphaning ? null : this.blockData.getHeight());
 		final boolean haveQoraHolders = !qoraHolders.isEmpty();
-		final long qoraHoldersShare = BlockChain.getInstance().getQoraHoldersShareAtHeight(this.blockData.getHeight());
+		final long qoraHoldersShare = BlockChain.getInstance().getQoraHoldersShare();
 
 		// Perform account-level-based reward scaling if appropriate
 		if (!haveFounders) {

src/main/java/org/qortal/block/BlockChain.java

@@ -104,27 +104,42 @@ public class BlockChain {
 	private List<RewardByHeight> rewardsByHeight;
 
 	/** Share of block reward/fees by account level */
-	public static class AccountLevelShareBin {
+	public static class AccountLevelShareBin implements Cloneable {
+		public int id;
 		public List<Integer> levels;
 		@XmlJavaTypeAdapter(value = org.qortal.api.AmountTypeAdapter.class)
 		public long share;
+
+		public Object clone() {
+			AccountLevelShareBin shareBinCopy = new AccountLevelShareBin();
+			List<Integer> levelsCopy = new ArrayList<>();
+			for (Integer level : this.levels) {
+				levelsCopy.add(level);
+			}
+			shareBinCopy.id = this.id;
+			shareBinCopy.levels = levelsCopy;
+			shareBinCopy.share = this.share;
+			return shareBinCopy;
+		}
 	}
 	private List<AccountLevelShareBin> sharesByLevel;
 	/** Generated lookup of share-bin by account level */
 	private AccountLevelShareBin[] shareBinsByLevel;
 
-	/** Share of block reward/fees to legacy QORA coin holders, by block height */
-	public static class ShareByHeight {
-		public int height;
-		@XmlJavaTypeAdapter(value = org.qortal.api.AmountTypeAdapter.class)
-		public long share;
-	}
-	private List<ShareByHeight> qoraHoldersShareByHeight;
+	/** Share of block reward/fees to legacy QORA coin holders */
+	@XmlJavaTypeAdapter(value = org.qortal.api.AmountTypeAdapter.class)
+	private Long qoraHoldersShare;
 
 	/** How many legacy QORA per 1 QORT of block reward. */
 	@XmlJavaTypeAdapter(value = org.qortal.api.AmountTypeAdapter.class)
 	private Long qoraPerQortReward;
 
+	/** Minimum number of accounts before a share bin is considered activated */
+	private int minAccountsToActivateShareBin;
+
+	/** Min level at which share bin activation takes place; lower levels allow less than minAccountsPerShareBin */
+	private int shareBinActivationMinLevel;
+
 	/**
 	 * Number of minted blocks required to reach next level from previous.
 	 * <p>
@@ -170,6 +185,14 @@ public class BlockChain {
 	/** Maximum time to retain online account signatures (ms) for block validity checks, to allow for clock variance. */
 	private long onlineAccountSignaturesMaxLifetime;
 
+	/** Feature trigger timestamp for ONLINE_ACCOUNTS_MODULUS time interval increase. Can't use
+	 * featureTriggers because unit tests need to set this value via Reflection. */
+	private long onlineAccountsModulusV2Timestamp;
+
+	/** Feature trigger timestamp for online accounts mempow verification. Can't use featureTriggers
+	 * because unit tests need to set this value via Reflection. */
+	private long onlineAccountsMemoryPoWTimestamp;
+
 	/** Max reward shares by block height */
 	public static class MaxRewardSharesByTimestamp {
 		public long timestamp;
@@ -325,6 +348,15 @@ public class BlockChain {
 		return this.maxBlockSize;
 	}
 
+	// Online accounts
+	public long getOnlineAccountsModulusV2Timestamp() {
+		return this.onlineAccountsModulusV2Timestamp;
+	}
+
+	public long getOnlineAccountsMemoryPoWTimestamp() {
+		return this.onlineAccountsMemoryPoWTimestamp;
+	}
+
 	/** Returns true if approval-needing transaction types require a txGroupId other than NO_GROUP. */
 	public boolean getRequireGroupForApproval() {
 		return this.requireGroupForApproval;
@@ -358,10 +390,22 @@ public class BlockChain {
 		return this.cumulativeBlocksByLevel;
 	}
 
+	public long getQoraHoldersShare() {
+		return this.qoraHoldersShare;
+	}
+
 	public long getQoraPerQortReward() {
 		return this.qoraPerQortReward;
 	}
 
+	public int getMinAccountsToActivateShareBin() {
+		return this.minAccountsToActivateShareBin;
+	}
+
+	public int getShareBinActivationMinLevel() {
+		return this.shareBinActivationMinLevel;
+	}
+
 	public int getMinAccountLevelToMint() {
 		return this.minAccountLevelToMint;
 	}
@@ -468,15 +512,6 @@ public class BlockChain {
 		return 0;
 	}
 
-	public long getQoraHoldersShareAtHeight(int ourHeight) {
-		// Scan through for QORA share at our height
-		for (int i = qoraHoldersShareByHeight.size() - 1; i >= 0; --i)
-			if (qoraHoldersShareByHeight.get(i).height <= ourHeight)
-				return qoraHoldersShareByHeight.get(i).share;
-
-		return 0;
-	}
-
 	/** Validate blockchain config read from JSON */
 	private void validateConfig() {
 		if (this.genesisInfo == null)
@@ -488,8 +523,8 @@ public class BlockChain {
 		if (this.sharesByLevel == null)
 			Settings.throwValidationError("No \"sharesByLevel\" entry found in blockchain config");
 
-		if (this.qoraHoldersShareByHeight == null)
-			Settings.throwValidationError("No \"qoraHoldersShareByHeight\" entry found in blockchain config");
+		if (this.qoraHoldersShare == null)
+			Settings.throwValidationError("No \"qoraHoldersShare\" entry found in blockchain config");
 
 		if (this.qoraPerQortReward == null)
 			Settings.throwValidationError("No \"qoraPerQortReward\" entry found in blockchain config");
@@ -527,7 +562,7 @@ public class BlockChain {
 				Settings.throwValidationError(String.format("Missing feature trigger \"%s\" in blockchain config", featureTrigger.name()));
 
 		// Check block reward share bounds
-		long totalShare = this.getQoraHoldersShareAtHeight(1);
+		long totalShare = this.qoraHoldersShare;
 		// Add share percents for account-level-based rewards
 		for (AccountLevelShareBin accountLevelShareBin : this.sharesByLevel)
 			totalShare += accountLevelShareBin.share;
@@ -565,7 +600,6 @@ public class BlockChain {
 		this.blocksNeededByLevel = Collections.unmodifiableList(this.blocksNeededByLevel);
 		this.cumulativeBlocksByLevel = Collections.unmodifiableList(this.cumulativeBlocksByLevel);
 		this.blockTimingsByHeight = Collections.unmodifiableList(this.blockTimingsByHeight);
-		this.qoraHoldersShareByHeight = Collections.unmodifiableList(this.qoraHoldersShareByHeight);
 	}
 
 	/**

src/main/java/org/qortal/controller/BlockMinter.java

@@ -90,37 +90,40 @@ public class BlockMinter extends Thread {
 
 		List<Block> newBlocks = new ArrayList<>();
 
-		// Flags for tracking change in whether minting is possible,
-		// so we can notify Controller, and further update SysTray, etc.
-		boolean isMintingPossible = false;
-		boolean wasMintingPossible = isMintingPossible;
-		while (running) {
-			if (isMintingPossible != wasMintingPossible)
-				Controller.getInstance().onMintingPossibleChange(isMintingPossible);
+		try (final Repository repository = RepositoryManager.getRepository()) {
+			// Going to need this a lot...
+			BlockRepository blockRepository = repository.getBlockRepository();
 
-			wasMintingPossible = isMintingPossible;
+			// Flags for tracking change in whether minting is possible,
+			// so we can notify Controller, and further update SysTray, etc.
+			boolean isMintingPossible = false;
+			boolean wasMintingPossible = isMintingPossible;
+			while (running) {
+				if (isMintingPossible != wasMintingPossible)
+					Controller.getInstance().onMintingPossibleChange(isMintingPossible);
 
-			try {
-				// Sleep for a while
-				Thread.sleep(1000);
+				wasMintingPossible = isMintingPossible;
 
-				isMintingPossible = false;
+				try {
+					// Free up any repository locks
+					repository.discardChanges();
 
-				final Long now = NTP.getTime();
-				if (now == null)
-					continue;
+					// Sleep for a while
+					Thread.sleep(1000);
 
-				final Long minLatestBlockTimestamp = Controller.getMinimumLatestBlockTimestamp();
-				if (minLatestBlockTimestamp == null)
-					continue;
+					isMintingPossible = false;
 
-				// No online accounts for current timestamp? (e.g. during startup)
-				if (!OnlineAccountsManager.getInstance().hasOnlineAccounts())
-					continue;
+					final Long now = NTP.getTime();
+					if (now == null)
+						continue;
 
-				try (final Repository repository = RepositoryManager.getRepository()) {
-					// Going to need this a lot...
-					BlockRepository blockRepository = repository.getBlockRepository();
+					final Long minLatestBlockTimestamp = Controller.getMinimumLatestBlockTimestamp();
+					if (minLatestBlockTimestamp == null)
+						continue;
+
+					// No online accounts for current timestamp? (e.g. during startup)
+					if (!OnlineAccountsManager.getInstance().hasOnlineAccounts())
+						continue;
 
 					List<MintingAccountData> mintingAccountsData = repository.getAccountRepository().getMintingAccounts();
 					// No minting accounts?
@@ -198,10 +201,6 @@ public class BlockMinter extends Thread {
 					// so go ahead and mint a block if possible.
 					isMintingPossible = true;
 
-					// Reattach newBlocks to new repository handle
-					for (Block newBlock : newBlocks)
-						newBlock.setRepository(repository);
-
 					// Check blockchain hasn't changed
 					if (previousBlockData == null || !Arrays.equals(previousBlockData.getSignature(), lastBlockData.getSignature())) {
 						previousBlockData = lastBlockData;
@@ -439,13 +438,13 @@ public class BlockMinter extends Thread {
 						Network network = Network.getInstance();
 						network.broadcast(broadcastPeer -> network.buildHeightMessage(broadcastPeer, newBlockData));
 					}
-				} catch (DataException e) {
-					LOGGER.warn("Repository issue while running block minter", e);
+				} catch (InterruptedException e) {
+					// We've been interrupted - time to exit
+					return;
 				}
-			} catch (InterruptedException e) {
-				// We've been interrupted - time to exit
-				return;
 			}
+		} catch (DataException e) {
+			LOGGER.warn("Repository issue while running block minter - NO LONGER MINTING", e);
 		}
 	}
 

src/main/java/org/qortal/controller/Controller.java

@@ -1245,6 +1245,10 @@ public class Controller extends Thread {
 				OnlineAccountsManager.getInstance().onNetworkGetOnlineAccountsV3Message(peer, message);
 				break;
 
+			case ONLINE_ACCOUNTS_V3:
+				OnlineAccountsManager.getInstance().onNetworkOnlineAccountsV3Message(peer, message);
+				break;
+
 			case GET_ARBITRARY_DATA:
 				// Not currently supported
 				break;

src/main/java/org/qortal/controller/OnlineAccountsManager.java

@@ -9,6 +9,7 @@ import org.qortal.account.PrivateKeyAccount;
 import org.qortal.block.Block;
 import org.qortal.block.BlockChain;
 import org.qortal.crypto.Crypto;
+import org.qortal.crypto.MemoryPoW;
 import org.qortal.crypto.Qortal25519Extras;
 import org.qortal.data.account.MintingAccountData;
 import org.qortal.data.account.RewardShareData;
@@ -19,10 +20,13 @@ import org.qortal.network.message.*;
 import org.qortal.repository.DataException;
 import org.qortal.repository.Repository;
 import org.qortal.repository.RepositoryManager;
+import org.qortal.settings.Settings;
 import org.qortal.utils.Base58;
 import org.qortal.utils.NTP;
 import org.qortal.utils.NamedThreadFactory;
 
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
 import java.util.*;
 import java.util.concurrent.*;
 import java.util.stream.Collectors;
@@ -36,7 +40,8 @@ public class OnlineAccountsManager {
     /**
      * How long online accounts signatures last before they expire.
      */
-    public static final long ONLINE_TIMESTAMP_MODULUS = 5 * 60 * 1000L;
+    private static final long ONLINE_TIMESTAMP_MODULUS_V1 = 5 * 60 * 1000L;
+    private static final long ONLINE_TIMESTAMP_MODULUS_V2 = 30 * 60 * 1000L;
 
     /**
      * How many 'current' timestamp-sets of online accounts we cache.
@@ -51,11 +56,15 @@ public class OnlineAccountsManager {
     private static final long ONLINE_ACCOUNTS_QUEUE_INTERVAL = 100L; //ms
     private static final long ONLINE_ACCOUNTS_TASKS_INTERVAL = 10 * 1000L; // ms
     private static final long ONLINE_ACCOUNTS_LEGACY_BROADCAST_INTERVAL = 60 * 1000L; // ms
-    private static final long ONLINE_ACCOUNTS_BROADCAST_INTERVAL = 15 * 1000L; // ms
+    private static final long ONLINE_ACCOUNTS_BROADCAST_INTERVAL = 5 * 1000L; // ms
 
     private static final long ONLINE_ACCOUNTS_V2_PEER_VERSION = 0x0300020000L; // v3.2.0
     private static final long ONLINE_ACCOUNTS_V3_PEER_VERSION = 0x0300040000L; // v3.4.0
 
+    // MemoryPoW
+    public final int POW_BUFFER_SIZE = 1 * 1024 * 1024; // bytes
+    public int POW_DIFFICULTY = 18; // leading zero bits
+
     private final ScheduledExecutorService executor = Executors.newScheduledThreadPool(4, new NamedThreadFactory("OnlineAccounts"));
     private volatile boolean isStopping = false;
 
@@ -78,12 +87,24 @@ public class OnlineAccountsManager {
 
     private boolean hasOurOnlineAccounts = false;
 
+    public static long getOnlineTimestampModulus() {
+        Long now = NTP.getTime();
+        if (now != null && now >= BlockChain.getInstance().getOnlineAccountsModulusV2Timestamp()) {
+            return ONLINE_TIMESTAMP_MODULUS_V2;
+        }
+        return ONLINE_TIMESTAMP_MODULUS_V1;
+    }
     public static Long getCurrentOnlineAccountTimestamp() {
         Long now = NTP.getTime();
         if (now == null)
             return null;
 
-        return (now / ONLINE_TIMESTAMP_MODULUS) * ONLINE_TIMESTAMP_MODULUS;
+        long onlineTimestampModulus = getOnlineTimestampModulus();
+        return (now / onlineTimestampModulus) * onlineTimestampModulus;
+    }
+
+    public static long toOnlineAccountTimestamp(long timestamp) {
+        return (timestamp / getOnlineTimestampModulus()) * getOnlineTimestampModulus();
     }
 
     private OnlineAccountsManager() {
@@ -131,6 +152,7 @@ public class OnlineAccountsManager {
 
         byte[] timestampBytes = Longs.toByteArray(onlineAccountsTimestamp);
         final boolean useAggregateCompatibleSignature = onlineAccountsTimestamp >= BlockChain.getInstance().getAggregateSignatureTimestamp();
+        final boolean mempowActive = onlineAccountsTimestamp >= BlockChain.getInstance().getOnlineAccountsMemoryPoWTimestamp();
 
         Set<OnlineAccountData> replacementAccounts = new HashSet<>();
         for (PrivateKeyAccount onlineAccount : onlineAccounts) {
@@ -141,7 +163,9 @@ public class OnlineAccountsManager {
                     : onlineAccount.sign(timestampBytes);
             byte[] publicKey = onlineAccount.getPublicKey();
 
-            OnlineAccountData ourOnlineAccountData = new OnlineAccountData(onlineAccountsTimestamp, signature, publicKey);
+            Integer nonce = mempowActive ? new Random().nextInt(500000) : null;
+
+            OnlineAccountData ourOnlineAccountData = new OnlineAccountData(onlineAccountsTimestamp, signature, publicKey, nonce);
             replacementAccounts.add(ourOnlineAccountData);
         }
 
@@ -181,6 +205,52 @@ public class OnlineAccountsManager {
         }
     }
 
+    /**
+     * Check if supplied onlineAccountData is superior (i.e. has a nonce value) than existing record.
+     * Two entries are considered equal even if the nonce differs, to prevent multiple variations
+     * co-existing. For this reason, we need to be able to check if a new OnlineAccountData entry should
+     * replace the existing one, which may be missing the nonce.
+     * @param onlineAccountData
+     * @return true if supplied data is superior to existing entry
+     */
+    private boolean isOnlineAccountsDataSuperior(OnlineAccountData onlineAccountData) {
+        if (onlineAccountData.getNonce() == null || onlineAccountData.getNonce() < 0) {
+            // New online account data has no usable nonce value, so it won't be better than anything we already have
+            return false;
+        }
+
+        // New online account data has a nonce value, so check if there is any existing data to compare against
+        Set<OnlineAccountData> existingOnlineAccountsForTimestamp = this.currentOnlineAccounts.get(onlineAccountData.getTimestamp());
+        if (existingOnlineAccountsForTimestamp == null) {
+            // No existing online accounts data with this timestamp yet
+            return false;
+        }
+
+        // Check if a duplicate entry exists
+        OnlineAccountData existingOnlineAccountData = null;
+        for (OnlineAccountData existingAccount : existingOnlineAccountsForTimestamp) {
+            if (existingAccount.equals(onlineAccountData)) {
+                // Found existing online account data
+                existingOnlineAccountData = existingAccount;
+                break;
+            }
+        }
+
+        if (existingOnlineAccountData == null) {
+            // No existing online accounts data, so nothing to compare
+            return false;
+        }
+
+        if (existingOnlineAccountData.getNonce() == null || existingOnlineAccountData.getNonce() < 0) {
+            // Existing data has no usable nonce value(s) so we want to replace it with the new one
+            return true;
+        }
+
+        // Both new and old data have nonce values so the new data isn't considered superior
+        return false;
+    }
+
+
     // Utilities
 
     public static byte[] xorByteArrayInPlace(byte[] inplaceArray, byte[] otherArray) {
@@ -203,11 +273,17 @@ public class OnlineAccountsManager {
         long onlineAccountTimestamp = onlineAccountData.getTimestamp();
 
         // Check timestamp is 'recent' here
-        if (Math.abs(onlineAccountTimestamp - now) > ONLINE_TIMESTAMP_MODULUS * 2) {
+        if (Math.abs(onlineAccountTimestamp - now) > getOnlineTimestampModulus() * 2) {
             LOGGER.trace(() -> String.format("Rejecting online account %s with out of range timestamp %d", Base58.encode(rewardSharePublicKey), onlineAccountTimestamp));
             return false;
         }
 
+        // Check timestamp is a multiple of online timestamp modulus
+        if (onlineAccountTimestamp % getOnlineTimestampModulus() != 0) {
+            LOGGER.trace(() -> String.format("Rejecting online account %s with invalid timestamp %d", Base58.encode(rewardSharePublicKey), onlineAccountTimestamp));
+            return false;
+        }
+
         // Verify signature
         byte[] data = Longs.toByteArray(onlineAccountData.getTimestamp());
         boolean isSignatureValid = onlineAccountTimestamp >= BlockChain.getInstance().getAggregateSignatureTimestamp()
@@ -233,6 +309,14 @@ public class OnlineAccountsManager {
             return false;
         }
 
+        // Validate mempow if feature trigger is active
+        if (now >= BlockChain.getInstance().getOnlineAccountsMemoryPoWTimestamp()) {
+            if (!getInstance().verifyMemoryPoW(onlineAccountData, now)) {
+                LOGGER.trace(() -> String.format("Rejecting online reward-share for account %s due to invalid PoW nonce", mintingAccount.getAddress()));
+                return false;
+            }
+        }
+
         return true;
     }
 
@@ -290,6 +374,12 @@ public class OnlineAccountsManager {
         long onlineAccountTimestamp = onlineAccountData.getTimestamp();
 
         Set<OnlineAccountData> onlineAccounts = this.currentOnlineAccounts.computeIfAbsent(onlineAccountTimestamp, k -> ConcurrentHashMap.newKeySet());
+
+        boolean isSuperiorEntry = isOnlineAccountsDataSuperior(onlineAccountData);
+        if (isSuperiorEntry)
+            // Remove existing inferior entry so it can be re-added below (it's likely the existing copy is missing a nonce value)
+            onlineAccounts.remove(onlineAccountData);
+
         boolean isNewEntry = onlineAccounts.add(onlineAccountData);
 
         if (isNewEntry)
@@ -308,7 +398,7 @@ public class OnlineAccountsManager {
         if (now == null)
             return;
 
-        final long cutoffThreshold = now - MAX_CACHED_TIMESTAMP_SETS * ONLINE_TIMESTAMP_MODULUS;
+        final long cutoffThreshold = now - MAX_CACHED_TIMESTAMP_SETS * getOnlineTimestampModulus();
         this.currentOnlineAccounts.keySet().removeIf(timestamp -> timestamp < cutoffThreshold);
         this.currentOnlineAccountsHashes.keySet().removeIf(timestamp -> timestamp < cutoffThreshold);
     }
@@ -377,13 +467,26 @@ public class OnlineAccountsManager {
             return;
         }
 
+        // 'next' timestamp (prioritize this as it's the most important)
+        final long nextOnlineAccountsTimestamp = toOnlineAccountTimestamp(now) + getOnlineTimestampModulus();
+        boolean success = computeOurAccountsForTimestamp(nextOnlineAccountsTimestamp);
+        if (!success) {
+            // We didn't compute the required nonce value(s), and so can't proceed until they have been retried
+            return;
+        }
+
+        // 'current' timestamp
+        computeOurAccountsForTimestamp(onlineAccountsTimestamp);
+    }
+
+    private boolean computeOurAccountsForTimestamp(long onlineAccountsTimestamp) {
         List<MintingAccountData> mintingAccounts;
         try (final Repository repository = RepositoryManager.getRepository()) {
             mintingAccounts = repository.getAccountRepository().getMintingAccounts();
 
             // We have no accounts to send
             if (mintingAccounts.isEmpty())
-                return;
+                return false;
 
             // Only active reward-shares allowed
             Iterator<MintingAccountData> iterator = mintingAccounts.iterator();
@@ -406,7 +509,7 @@ public class OnlineAccountsManager {
             }
         } catch (DataException e) {
             LOGGER.warn(String.format("Repository issue trying to fetch minting accounts: %s", e.getMessage()));
-            return;
+            return false;
         }
 
         final boolean useAggregateCompatibleSignature = onlineAccountsTimestamp >= BlockChain.getInstance().getAggregateSignatureTimestamp();
@@ -418,13 +521,46 @@ public class OnlineAccountsManager {
             byte[] privateKey = mintingAccountData.getPrivateKey();
             byte[] publicKey = Crypto.toPublicKey(privateKey);
 
+            // Generate bytes for mempow
+            byte[] mempowBytes;
+            try {
+                mempowBytes = this.getMemoryPoWBytes(publicKey, onlineAccountsTimestamp);
+            }
+            catch (IOException e) {
+                LOGGER.info("Unable to create bytes for MemoryPoW. Moving on to next account...");
+                continue;
+            }
+
+            // Compute nonce
+            Integer nonce;
+            if (isMemoryPoWActive(NTP.getTime())) {
+                try {
+                    nonce = this.computeMemoryPoW(mempowBytes, publicKey, onlineAccountsTimestamp);
+                    if (nonce == null) {
+                        // A nonce is required
+                        return false;
+                    }
+                } catch (TimeoutException e) {
+                    LOGGER.info(String.format("Timed out computing nonce for account %.8s", Base58.encode(publicKey)));
+                    return false;
+                }
+            }
+            else {
+                // Send -1 if we haven't computed a nonce due to feature trigger timestamp
+                nonce = -1;
+            }
+
             byte[] signature = useAggregateCompatibleSignature
                     ? Qortal25519Extras.signForAggregation(privateKey, timestampBytes)
                     : Crypto.sign(privateKey, timestampBytes);
 
             // Our account is online
-            OnlineAccountData ourOnlineAccountData = new OnlineAccountData(onlineAccountsTimestamp, signature, publicKey);
-            ourOnlineAccounts.add(ourOnlineAccountData);
+            OnlineAccountData ourOnlineAccountData = new OnlineAccountData(onlineAccountsTimestamp, signature, publicKey, nonce);
+
+            // Make sure to verify before adding
+            if (verifyMemoryPoW(ourOnlineAccountData, NTP.getTime())) {
+                ourOnlineAccounts.add(ourOnlineAccountData);
+            }
         }
 
         this.hasOurOnlineAccounts = !ourOnlineAccounts.isEmpty();
@@ -432,14 +568,14 @@ public class OnlineAccountsManager {
         boolean hasInfoChanged = addAccounts(ourOnlineAccounts);
 
         if (!hasInfoChanged)
-            return;
+            return false;
 
         Message messageV1 = new OnlineAccountsMessage(ourOnlineAccounts);
         Message messageV2 = new OnlineAccountsV2Message(ourOnlineAccounts);
-        Message messageV3 = new OnlineAccountsV2Message(ourOnlineAccounts); // TODO: V3 message
+        Message messageV3 = new OnlineAccountsV3Message(ourOnlineAccounts);
 
         Network.getInstance().broadcast(peer ->
-                peer.getPeersVersion() >= ONLINE_ACCOUNTS_V3_PEER_VERSION
+                peer.getPeersVersion() >= OnlineAccountsV3Message.MIN_PEER_VERSION
                         ? messageV3
                         : peer.getPeersVersion() >= ONLINE_ACCOUNTS_V2_PEER_VERSION
                         ? messageV2
@@ -447,8 +583,77 @@ public class OnlineAccountsManager {
         );
 
         LOGGER.debug("Broadcasted {} online account{} with timestamp {}", ourOnlineAccounts.size(), (ourOnlineAccounts.size() != 1 ? "s" : ""), onlineAccountsTimestamp);
+
+        return true;
     }
 
+
+
+    // MemoryPoW
+
+    private boolean isMemoryPoWActive(Long timestamp) {
+        if (timestamp >= BlockChain.getInstance().getOnlineAccountsMemoryPoWTimestamp() || Settings.getInstance().isOnlineAccountsMemPoWEnabled()) {
+            return true;
+        }
+        return false;
+    }
+    private byte[] getMemoryPoWBytes(byte[] publicKey, long onlineAccountsTimestamp) throws IOException {
+        byte[] timestampBytes = Longs.toByteArray(onlineAccountsTimestamp);
+
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        outputStream.write(publicKey);
+        outputStream.write(timestampBytes);
+
+        return outputStream.toByteArray();
+    }
+
+    private Integer computeMemoryPoW(byte[] bytes, byte[] publicKey, long onlineAccountsTimestamp) throws TimeoutException {
+        if (!isMemoryPoWActive(NTP.getTime())) {
+            LOGGER.info("Mempow start timestamp not yet reached, and onlineAccountsMemPoWEnabled not enabled in settings");
+            return null;
+        }
+
+        LOGGER.info(String.format("Computing nonce for account %.8s and timestamp %d...", Base58.encode(publicKey), onlineAccountsTimestamp));
+
+        // Calculate the time until the next online timestamp and use it as a timeout when computing the nonce
+        Long startTime = NTP.getTime();
+        final long nextOnlineAccountsTimestamp = toOnlineAccountTimestamp(startTime) + getOnlineTimestampModulus();
+        long timeUntilNextTimestamp = nextOnlineAccountsTimestamp - startTime;
+
+        Integer nonce = MemoryPoW.compute2(bytes, POW_BUFFER_SIZE, POW_DIFFICULTY, timeUntilNextTimestamp);
+
+        double totalSeconds = (NTP.getTime() - startTime) / 1000.0f;
+        int minutes = (int) ((totalSeconds % 3600) / 60);
+        int seconds = (int) (totalSeconds % 60);
+        double hashRate = nonce / totalSeconds;
+
+        LOGGER.info(String.format("Computed nonce for timestamp %d and account %.8s: %d. Buffer size: %d. Difficulty: %d. " +
+                        "Time taken: %02d:%02d. Hashrate: %f", onlineAccountsTimestamp, Base58.encode(publicKey),
+                nonce, POW_BUFFER_SIZE, POW_DIFFICULTY, minutes, seconds, hashRate));
+
+        return nonce;
+    }
+
+    public boolean verifyMemoryPoW(OnlineAccountData onlineAccountData, Long timestamp) {
+        if (!isMemoryPoWActive(timestamp)) {
+            // Not active yet, so treat it as valid
+            return true;
+        }
+
+        int nonce = onlineAccountData.getNonce();
+
+        byte[] mempowBytes;
+        try {
+            mempowBytes = this.getMemoryPoWBytes(onlineAccountData.getPublicKey(), onlineAccountData.getTimestamp());
+        } catch (IOException e) {
+            return false;
+        }
+
+        // Verify the nonce
+        return MemoryPoW.verify2(mempowBytes, POW_BUFFER_SIZE, POW_DIFFICULTY, nonce);
+    }
+
+
     /**
      * Returns whether online accounts manager has any online accounts with timestamp recent enough to be considered currently online.
      */
@@ -706,9 +911,32 @@ public class OnlineAccountsManager {
             }
         }
 
-        Message onlineAccountsMessage = new OnlineAccountsV2Message(outgoingOnlineAccounts); // TODO: V3 message
-        peer.sendMessage(onlineAccountsMessage);
+        peer.sendMessage(
+                peer.getPeersVersion() >= OnlineAccountsV3Message.MIN_PEER_VERSION ?
+                        new OnlineAccountsV3Message(outgoingOnlineAccounts) :
+                        new OnlineAccountsV2Message(outgoingOnlineAccounts)
+        );
 
         LOGGER.debug("Sent {} online accounts to {}", outgoingOnlineAccounts.size(), peer);
     }
+
+    public void onNetworkOnlineAccountsV3Message(Peer peer, Message message) {
+        OnlineAccountsV3Message onlineAccountsMessage = (OnlineAccountsV3Message) message;
+
+        List<OnlineAccountData> peersOnlineAccounts = onlineAccountsMessage.getOnlineAccounts();
+        LOGGER.debug("Received {} online accounts from {}", peersOnlineAccounts.size(), peer);
+
+        int importCount = 0;
+
+        // Add any online accounts to the queue that aren't already present
+        for (OnlineAccountData onlineAccountData : peersOnlineAccounts) {
+            boolean isNewEntry = onlineAccountsImportQueue.add(onlineAccountData);
+
+            if (isNewEntry)
+                importCount++;
+        }
+
+        if (importCount > 0)
+            LOGGER.debug("Added {} online accounts to queue", importCount);
+    }
 }

src/main/java/org/qortal/crosschain/Bitcoiny.java

@@ -29,6 +29,7 @@ import org.bitcoinj.wallet.SendRequest;
 import org.bitcoinj.wallet.Wallet;
 import org.qortal.api.model.SimpleForeignTransaction;
 import org.qortal.crypto.Crypto;
+import org.qortal.settings.Settings;
 import org.qortal.utils.Amounts;
 import org.qortal.utils.BitTwiddling;
 
@@ -61,11 +62,6 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 	/** How many wallet keys to generate in each batch. */
 	private static final int WALLET_KEY_LOOKAHEAD_INCREMENT = 3;
 
-	/** How many wallet keys to generate when using bitcoinj as the data provider.
-	 * We must use a higher value here since we are unable to request multiple batches of keys.
-	 * Without this, the bitcoinj state can be missing transactions, causing errors such as "insufficient balance". */
-	private static final int WALLET_KEY_LOOKAHEAD_INCREMENT_BITCOINJ = 50;
-
 	/** Byte offset into raw block headers to block timestamp. */
 	private static final int TIMESTAMP_OFFSET = 4 + 32 + 32;
 
@@ -409,9 +405,6 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 			Set<BitcoinyTransaction> walletTransactions = new HashSet<>();
 			Set<String> keySet = new HashSet<>();
 
-			// Set the number of consecutive empty batches required before giving up
-			final int numberOfAdditionalBatchesToSearch = 7;
-
 			int unusedCounter = 0;
 			int ki = 0;
 			do {
@@ -438,12 +431,12 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 
 				if (areAllKeysUnused) {
 					// No transactions
-					if (unusedCounter >= numberOfAdditionalBatchesToSearch) {
+					if (unusedCounter >= Settings.getInstance().getGapLimit()) {
 						// ... and we've hit our search limit
 						break;
 					}
 					// We haven't hit our search limit yet so increment the counter and keep looking
-					unusedCounter++;
+					unusedCounter += WALLET_KEY_LOOKAHEAD_INCREMENT;
 				} else {
 					// Some keys in this batch were used, so reset the counter
 					unusedCounter = 0;
@@ -630,7 +623,7 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 			this.keyChain = this.wallet.getActiveKeyChain();
 
 			// Set up wallet's key chain
-			this.keyChain.setLookaheadSize(Bitcoiny.WALLET_KEY_LOOKAHEAD_INCREMENT_BITCOINJ);
+			this.keyChain.setLookaheadSize(Settings.getInstance().getBitcoinjLookaheadSize());
 			this.keyChain.maybeLookAhead();
 		}
 

src/main/java/org/qortal/crypto/MemoryPoW.java

@@ -1,10 +1,44 @@
 package org.qortal.crypto;
 
+import org.qortal.utils.NTP;
+
 import java.nio.ByteBuffer;
+import java.util.concurrent.TimeoutException;
 
 public class MemoryPoW {
 
+	/**
+	 * Compute a MemoryPoW nonce
+	 *
+	 * @param data
+	 * @param workBufferLength
+	 * @param difficulty
+	 * @return
+	 * @throws TimeoutException
+	 */
 	public static Integer compute2(byte[] data, int workBufferLength, long difficulty) {
+		try {
+			return MemoryPoW.compute2(data, workBufferLength, difficulty, null);
+
+		} catch (TimeoutException e) {
+			// This won't happen, because above timeout is null
+			return null;
+		}
+	}
+
+	/**
+	 * Compute a MemoryPoW nonce, with optional timeout
+	 *
+	 * @param data
+	 * @param workBufferLength
+	 * @param difficulty
+	 * @param timeout maximum number of milliseconds to compute for before giving up,<br>or null if no timeout
+	 * @return
+	 * @throws TimeoutException
+	 */
+	public static Integer compute2(byte[] data, int workBufferLength, long difficulty, Long timeout) throws TimeoutException {
+		long startTime = NTP.getTime();
+
 		// Hash data with SHA256
 		byte[] hash = Crypto.digest(data);
 
@@ -33,6 +67,13 @@ public class MemoryPoW {
 			if (Thread.currentThread().isInterrupted())
 				return -1;
 
+			if (timeout != null) {
+				long now = NTP.getTime();
+				if (now > startTime + timeout) {
+					throw new TimeoutException("Timeout reached");
+				}
+			}
+
 			seed *= seedMultiplier; // per nonce
 
 			state[0] = longHash[0] ^ seed;

src/main/java/org/qortal/data/network/OnlineAccountData.java

@@ -16,6 +16,7 @@ public class OnlineAccountData {
 	protected long timestamp;
 	protected byte[] signature;
 	protected byte[] publicKey;
+	protected Integer nonce;
 
 	@XmlTransient
 	private int hash;
@@ -26,10 +27,15 @@ public class OnlineAccountData {
 	protected OnlineAccountData() {
 	}
 
-	public OnlineAccountData(long timestamp, byte[] signature, byte[] publicKey) {
+	public OnlineAccountData(long timestamp, byte[] signature, byte[] publicKey, Integer nonce) {
 		this.timestamp = timestamp;
 		this.signature = signature;
 		this.publicKey = publicKey;
+		this.nonce = nonce;
+	}
+
+	public OnlineAccountData(long timestamp, byte[] signature, byte[] publicKey) {
+		this(timestamp, signature, publicKey, null);
 	}
 
 	public long getTimestamp() {
@@ -44,6 +50,10 @@ public class OnlineAccountData {
 		return this.publicKey;
 	}
 
+	public Integer getNonce() {
+		return this.nonce;
+	}
+
 	// For JAXB
 	@XmlElement(name = "address")
 	protected String getAddress() {

src/main/java/org/qortal/network/Network.java

@@ -1375,26 +1375,17 @@ public class Network {
                 // We attempted to connect within the last day
                 // but we last managed to connect over a week ago.
                 Predicate<PeerData> isNotOldPeer = peerData -> {
-
-                    // First check if there was a connection attempt within the last day
-                    if (peerData.getLastAttempted() != null
-                            && peerData.getLastAttempted() > now - OLD_PEER_ATTEMPTED_PERIOD) {
-
-                        // There was, so now check if we had a successful connection in the last 7 days
-                        if (peerData.getLastConnected() != null
-                                && peerData.getLastConnected() > now - OLD_PEER_CONNECTION_PERIOD) {
-
-                            // We did, so this is NOT an 'old' peer
-                            return true;
-                        }
-
-                        // Last successful connection was more than 1 week ago - this is an 'old' peer
-                        return false;
-                    }
-                    else {
-                        // Best to wait until we have a connection attempt - assume not an 'old' peer until then
+                    if (peerData.getLastAttempted() == null
+                            || peerData.getLastAttempted() < now - OLD_PEER_ATTEMPTED_PERIOD) {
                         return true;
                     }
+
+                    if (peerData.getLastConnected() == null
+                            || peerData.getLastConnected() > now - OLD_PEER_CONNECTION_PERIOD) {
+                        return true;
+                    }
+
+                    return false;
                 };
 
                 // Disregard peers that are NOT 'old'

src/main/java/org/qortal/network/Peer.java

@@ -27,6 +27,8 @@ import java.nio.channels.SocketChannel;
 import java.security.SecureRandom;
 import java.util.*;
 import java.util.concurrent.*;
+import java.util.concurrent.atomic.LongAccumulator;
+import java.util.concurrent.atomic.LongAdder;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -153,6 +155,16 @@ public class Peer {
      */
     private CommonBlockData commonBlockData;
 
+    // Message stats
+
+    private static class MessageStats {
+        public final LongAdder count = new LongAdder();
+        public final LongAdder totalBytes = new LongAdder();
+    }
+
+    private final Map<MessageType, MessageStats> receivedMessageStats = new ConcurrentHashMap<>();
+    private final Map<MessageType, MessageStats> sentMessageStats = new ConcurrentHashMap<>();
+
     // Constructors
 
     /**
@@ -542,11 +554,18 @@ public class Peer {
                     // Tidy up buffers:
                     this.byteBuffer.flip();
                     // Read-only, flipped buffer's position will be after end of message, so copy that
+                    long messageByteSize = readOnlyBuffer.position();
                     this.byteBuffer.position(readOnlyBuffer.position());
                     // Copy bytes after read message to front of buffer,
                     // adjusting position accordingly, reset limit to capacity
                     this.byteBuffer.compact();
 
+                    // Record message stats
+                    MessageStats messageStats = this.receivedMessageStats.computeIfAbsent(message.getType(), k -> new MessageStats());
+                    // Ideally these two operations would be atomic, we could pack 'count' in top X bits of the 64-bit long, but meh
+                    messageStats.count.increment();
+                    messageStats.totalBytes.add(messageByteSize);
+
                     // Unsupported message type? Discard with no further processing
                     if (message.getType() == MessageType.UNSUPPORTED)
                         continue;
@@ -609,6 +628,12 @@ public class Peer {
 
                     LOGGER.trace("[{}] Sending {} message with ID {} to peer {}",
                             this.peerConnectionId, this.outputMessageType, this.outputMessageId, this);
+
+                    // Record message stats
+                    MessageStats messageStats = this.sentMessageStats.computeIfAbsent(message.getType(), k -> new MessageStats());
+                    // Ideally these two operations would be atomic, we could pack 'count' in top X bits of the 64-bit long, but meh
+                    messageStats.count.increment();
+                    messageStats.totalBytes.add(this.outputBuffer.limit());
                 } catch (MessageException e) {
                     // Something went wrong converting message to bytes, so discard but allow another round
                     LOGGER.warn("[{}] Failed to send {} message with ID {} to peer {}: {}", this.peerConnectionId,
@@ -799,8 +824,11 @@ public class Peer {
     }
 
     public void shutdown() {
+        boolean logStats = false;
+
         if (!isStopping) {
             LOGGER.debug("[{}] Shutting down peer {}", this.peerConnectionId, this);
+            logStats = true;
         }
         isStopping = true;
 
@@ -812,8 +840,34 @@ public class Peer {
                 LOGGER.debug("[{}] IOException while trying to close peer {}", this.peerConnectionId, this);
             }
         }
+
+        if (logStats && this.receivedMessageStats.size() > 0) {
+            StringBuilder statsBuilder = new StringBuilder(1024);
+            statsBuilder.append("peer ").append(this).append(" message stats:\n=received=");
+            appendMessageStats(statsBuilder, this.receivedMessageStats);
+            statsBuilder.append("\n=sent=");
+            appendMessageStats(statsBuilder, this.sentMessageStats);
+
+            LOGGER.debug(statsBuilder.toString());
+        }
     }
 
+    private static void appendMessageStats(StringBuilder statsBuilder, Map<MessageType, MessageStats> messageStats) {
+        if (messageStats.isEmpty()) {
+            statsBuilder.append("\n  none");
+            return;
+        }
+
+        messageStats.keySet().stream()
+                .sorted(Comparator.comparing(MessageType::name))
+                .forEach(messageType -> {
+                    MessageStats stats = messageStats.get(messageType);
+
+                    statsBuilder.append("\n  ").append(messageType.name())
+                            .append(": count=").append(stats.count.sum())
+                            .append(", total bytes=").append(stats.totalBytes.sum());
+                });
+    }
 
     // Minimum version
 

src/main/java/org/qortal/network/message/MessageType.java

@@ -46,7 +46,7 @@ public enum MessageType {
     GET_ONLINE_ACCOUNTS(81, GetOnlineAccountsMessage::fromByteBuffer),
     ONLINE_ACCOUNTS_V2(82, OnlineAccountsV2Message::fromByteBuffer),
     GET_ONLINE_ACCOUNTS_V2(83, GetOnlineAccountsV2Message::fromByteBuffer),
-    // ONLINE_ACCOUNTS_V3(84, OnlineAccountsV3Message::fromByteBuffer),
+    ONLINE_ACCOUNTS_V3(84, OnlineAccountsV3Message::fromByteBuffer),
     GET_ONLINE_ACCOUNTS_V3(85, GetOnlineAccountsV3Message::fromByteBuffer),
 
     ARBITRARY_DATA(90, ArbitraryDataMessage::fromByteBuffer),

src/main/java/org/qortal/network/message/OnlineAccountsV3Message.java

@@ -0,0 +1,121 @@
+package org.qortal.network.message;
+
+import com.google.common.primitives.Ints;
+import com.google.common.primitives.Longs;
+import org.qortal.data.network.OnlineAccountData;
+import org.qortal.transform.Transformer;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * For sending online accounts info to remote peer.
+ *
+ * Same format as V2, but with added support for a mempow nonce.
+ */
+public class OnlineAccountsV3Message extends Message {
+
+	public static final long MIN_PEER_VERSION = 0x300050000L; // 3.5.0
+
+	private List<OnlineAccountData> onlineAccounts;
+
+	public OnlineAccountsV3Message(List<OnlineAccountData> onlineAccounts) {
+		super(MessageType.ONLINE_ACCOUNTS_V3);
+
+		// Shortcut in case we have no online accounts
+		if (onlineAccounts.isEmpty()) {
+			this.dataBytes = Ints.toByteArray(0);
+			this.checksumBytes = Message.generateChecksum(this.dataBytes);
+			return;
+		}
+
+		// How many of each timestamp
+		Map<Long, Integer> countByTimestamp = new HashMap<>();
+
+		for (OnlineAccountData onlineAccountData : onlineAccounts) {
+			Long timestamp = onlineAccountData.getTimestamp();
+			countByTimestamp.compute(timestamp, (k, v) -> v == null ? 1 : ++v);
+		}
+
+		// We should know exactly how many bytes to allocate now
+		int byteSize = countByTimestamp.size() * (Transformer.INT_LENGTH + Transformer.TIMESTAMP_LENGTH)
+				+ onlineAccounts.size() * (Transformer.SIGNATURE_LENGTH + Transformer.PUBLIC_KEY_LENGTH);
+
+		ByteArrayOutputStream bytes = new ByteArrayOutputStream(byteSize);
+
+		try {
+			for (long timestamp : countByTimestamp.keySet()) {
+				bytes.write(Ints.toByteArray(countByTimestamp.get(timestamp)));
+
+				bytes.write(Longs.toByteArray(timestamp));
+
+				for (OnlineAccountData onlineAccountData : onlineAccounts) {
+					if (onlineAccountData.getTimestamp() == timestamp) {
+						bytes.write(onlineAccountData.getSignature());
+						bytes.write(onlineAccountData.getPublicKey());
+
+						// Nonce is optional; use -1 as placeholder if missing
+						int nonce = onlineAccountData.getNonce() != null ? onlineAccountData.getNonce() : -1;
+						bytes.write(Ints.toByteArray(nonce));
+					}
+				}
+			}
+		} catch (IOException e) {
+			throw new AssertionError("IOException shouldn't occur with ByteArrayOutputStream");
+		}
+
+		this.dataBytes = bytes.toByteArray();
+		this.checksumBytes = Message.generateChecksum(this.dataBytes);
+	}
+
+	private OnlineAccountsV3Message(int id, List<OnlineAccountData> onlineAccounts) {
+		super(id, MessageType.ONLINE_ACCOUNTS_V3);
+
+		this.onlineAccounts = onlineAccounts;
+	}
+
+	public List<OnlineAccountData> getOnlineAccounts() {
+		return this.onlineAccounts;
+	}
+
+	public static Message fromByteBuffer(int id, ByteBuffer bytes) throws MessageException {
+		int accountCount = bytes.getInt();
+
+		List<OnlineAccountData> onlineAccounts = new ArrayList<>(accountCount);
+
+		while (accountCount > 0) {
+			long timestamp = bytes.getLong();
+
+			for (int i = 0; i < accountCount; ++i) {
+				byte[] signature = new byte[Transformer.SIGNATURE_LENGTH];
+				bytes.get(signature);
+
+				byte[] publicKey = new byte[Transformer.PUBLIC_KEY_LENGTH];
+				bytes.get(publicKey);
+
+				// Nonce is optional - will be -1 if missing
+				Integer nonce = bytes.getInt();
+				if (nonce < 0) {
+					nonce = null;
+				}
+
+				onlineAccounts.add(new OnlineAccountData(timestamp, signature, publicKey, nonce));
+			}
+
+			if (bytes.hasRemaining()) {
+				accountCount = bytes.getInt();
+			} else {
+				// we've finished
+				accountCount = 0;
+			}
+		}
+
+		return new OnlineAccountsV3Message(id, onlineAccounts);
+	}
+
+}

src/main/java/org/qortal/settings/Settings.java

@@ -210,9 +210,9 @@ public class Settings {
 	private boolean allowConnectionsWithOlderPeerVersions = true;
 
 	/** Minimum time (in seconds) that we should attempt to remain connected to a peer for */
-	private int minPeerConnectionTime = 5 * 60; // seconds
+	private int minPeerConnectionTime = 60 * 60; // seconds
 	/** Maximum time (in seconds) that we should attempt to remain connected to a peer for */
-	private int maxPeerConnectionTime = 60 * 60; // seconds
+	private int maxPeerConnectionTime = 4 * 60 * 60; // seconds
 	/** Maximum time (in seconds) that a peer should remain connected when requesting QDN data */
 	private int maxDataPeerConnectionTime = 2 * 60; // seconds
 
@@ -283,6 +283,21 @@ public class Settings {
 	/** Additional offset added to values returned by NTP.getTime() */
 	private Long testNtpOffset = null;
 
+	// Online accounts
+
+	/** Whether to opt-in to mempow computations for online accounts, ahead of general release */
+	private boolean onlineAccountsMemPoWEnabled = false;
+
+
+	/* Foreign chains */
+
+	/** The number of consecutive empty addresses required before treating a wallet's transaction set as complete */
+	private int gapLimit = 24;
+
+	/** How many wallet keys to generate when using bitcoinj as the blockchain interface (e.g. when sending coins) */
+	private int bitcoinjLookaheadSize = 50;
+
+
 
 	// Data storage (QDN)
 
@@ -766,6 +781,10 @@ public class Settings {
 		return this.testNtpOffset;
 	}
 
+	public boolean isOnlineAccountsMemPoWEnabled() {
+		return this.onlineAccountsMemPoWEnabled;
+	}
+
 	public long getRepositoryBackupInterval() {
 		return this.repositoryBackupInterval;
 	}
@@ -872,6 +891,15 @@ public class Settings {
 	}
 
 
+	public int getGapLimit() {
+		return this.gapLimit;
+	}
+
+	public int getBitcoinjLookaheadSize() {
+		return bitcoinjLookaheadSize;
+	}
+
+
 	public boolean isQdnEnabled() {
 		return this.qdnEnabled;
 	}

src/main/java/org/qortal/transaction/PresenceTransaction.java

@@ -12,7 +12,6 @@ import java.util.function.Supplier;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.qortal.account.Account;
-import org.qortal.controller.Controller;
 import org.qortal.controller.OnlineAccountsManager;
 import org.qortal.controller.tradebot.TradeBot;
 import org.qortal.crosschain.ACCT;
@@ -49,7 +48,7 @@ public class PresenceTransaction extends Transaction {
 		REWARD_SHARE(0) {
 			@Override
 			public long getLifetime() {
-				return OnlineAccountsManager.ONLINE_TIMESTAMP_MODULUS;
+				return OnlineAccountsManager.getOnlineTimestampModulus();
 			}
 		},
 		TRADE_BOT(1) {

src/main/resources/blockchain.json

@@ -23,6 +23,8 @@
 	"founderEffectiveMintingLevel": 10,
 	"onlineAccountSignaturesMinLifetime": 43200000,
 	"onlineAccountSignaturesMaxLifetime": 86400000,
+	"onlineAccountsModulusV2Timestamp": 1659801600000,
+	"onlineAccountsMemoryPoWTimestamp": 9999999999999,
 	"rewardsByHeight": [
 		{ "height": 1, "reward": 5.00 },
 		{ "height": 259201, "reward": 4.75 },
@@ -39,17 +41,16 @@
 		{ "height": 3110401, "reward": 2.00 }
 	],
 	"sharesByLevel": [
-		{ "levels": [ 1, 2 ], "share": 0.05 },
-		{ "levels": [ 3, 4 ], "share": 0.10 },
-		{ "levels": [ 5, 6 ], "share": 0.15 },
-		{ "levels": [ 7, 8 ], "share": 0.20 },
-		{ "levels": [ 9, 10 ], "share": 0.25 }
-	],
-	"qoraHoldersShareByHeight": [
-		{ "height": 1, "share": 0.20 },
-		{ "height": 9999999, "share": 0.01 }
+		{ "id": 1, "levels": [ 1, 2 ], "share": 0.05 },
+		{ "id": 2, "levels": [ 3, 4 ], "share": 0.10 },
+		{ "id": 3, "levels": [ 5, 6 ], "share": 0.15 },
+		{ "id": 4, "levels": [ 7, 8 ], "share": 0.20 },
+		{ "id": 5, "levels": [ 9, 10 ], "share": 0.25 }
 	],
+	"qoraHoldersShare": 0.20,
 	"qoraPerQortReward": 250,
+	"minAccountsToActivateShareBin": 30,
+	"shareBinActivationMinLevel": 7,
 	"blocksNeededByLevel": [ 7200, 64800, 129600, 172800, 244000, 345600, 518400, 691200, 864000, 1036800 ],
 	"blockTimingsByHeight": [
 		{ "height": 1, "target": 60000, "deviation": 30000, "power": 0.2 }

src/test/java/org/qortal/test/SchnorrTests.java

@@ -8,6 +8,7 @@ import org.bouncycastle.jsse.provider.BouncyCastleJsseProvider;
 import org.junit.Test;
 import org.qortal.crypto.Qortal25519Extras;
 import org.qortal.data.network.OnlineAccountData;
+import org.qortal.test.common.AccountUtils;
 import org.qortal.transform.Transformer;
 
 import java.math.BigInteger;
@@ -28,8 +29,6 @@ public class SchnorrTests extends Qortal25519Extras {
         Security.insertProviderAt(new BouncyCastleJsseProvider(), 1);
     }
 
-    private static final SecureRandom SECURE_RANDOM = new SecureRandom();
-
     @Test
     public void testConversion() {
         // Scalar form
@@ -130,7 +129,7 @@ public class SchnorrTests extends Qortal25519Extras {
 
     @Test
     public void testSimpleAggregate() {
-        List<OnlineAccountData> onlineAccounts = generateOnlineAccounts(1);
+        List<OnlineAccountData> onlineAccounts = AccountUtils.generateOnlineAccounts(1);
 
         byte[] aggregatePublicKey = aggregatePublicKeys(onlineAccounts.stream().map(OnlineAccountData::getPublicKey).collect(Collectors.toUnmodifiableList()));
         System.out.printf("Aggregate public key: %s%n", HashCode.fromBytes(aggregatePublicKey));
@@ -151,7 +150,7 @@ public class SchnorrTests extends Qortal25519Extras {
 
     @Test
     public void testMultipleAggregate() {
-        List<OnlineAccountData> onlineAccounts = generateOnlineAccounts(5000);
+        List<OnlineAccountData> onlineAccounts = AccountUtils.generateOnlineAccounts(5000);
 
         byte[] aggregatePublicKey = aggregatePublicKeys(onlineAccounts.stream().map(OnlineAccountData::getPublicKey).collect(Collectors.toUnmodifiableList()));
         System.out.printf("Aggregate public key: %s%n", HashCode.fromBytes(aggregatePublicKey));
@@ -166,25 +165,4 @@ public class SchnorrTests extends Qortal25519Extras {
         byte[] timestampBytes = Longs.toByteArray(timestamp);
         assertTrue(verifyAggregated(aggregatePublicKey, aggregateSignature, timestampBytes));
     }
-
-    private List<OnlineAccountData> generateOnlineAccounts(int numAccounts) {
-        List<OnlineAccountData> onlineAccounts = new ArrayList<>();
-
-        long timestamp = System.currentTimeMillis();
-        byte[] timestampBytes = Longs.toByteArray(timestamp);
-
-        for (int a = 0; a < numAccounts; ++a) {
-            byte[] privateKey = new byte[Transformer.PUBLIC_KEY_LENGTH];
-            SECURE_RANDOM.nextBytes(privateKey);
-
-            byte[] publicKey = new byte[Transformer.PUBLIC_KEY_LENGTH];
-            Qortal25519Extras.generatePublicKey(privateKey, 0, publicKey, 0);
-
-            byte[] signature = signForAggregation(privateKey, timestampBytes);
-
-            onlineAccounts.add(new OnlineAccountData(timestamp, signature, publicKey));
-        }
-
-        return onlineAccounts;
-    }
 }

src/test/java/org/qortal/test/common/AccountUtils.java

@@ -1,12 +1,17 @@
 package org.qortal.test.common;
 
 import static org.junit.Assert.assertEquals;
+import static org.qortal.crypto.Qortal25519Extras.signForAggregation;
 
-import java.util.HashMap;
-import java.util.Map;
+import java.security.SecureRandom;
+import java.util.*;
 
+import com.google.common.primitives.Longs;
 import org.qortal.account.PrivateKeyAccount;
+import org.qortal.block.BlockChain;
 import org.qortal.crypto.Crypto;
+import org.qortal.crypto.Qortal25519Extras;
+import org.qortal.data.network.OnlineAccountData;
 import org.qortal.data.transaction.BaseTransactionData;
 import org.qortal.data.transaction.PaymentTransactionData;
 import org.qortal.data.transaction.RewardShareTransactionData;
@@ -14,6 +19,7 @@ import org.qortal.data.transaction.TransactionData;
 import org.qortal.group.Group;
 import org.qortal.repository.DataException;
 import org.qortal.repository.Repository;
+import org.qortal.transform.Transformer;
 import org.qortal.utils.Amounts;
 
 public class AccountUtils {
@@ -21,6 +27,8 @@ public class AccountUtils {
 	public static final int txGroupId = Group.NO_GROUP;
 	public static final long fee = 1L * Amounts.MULTIPLIER;
 
+	private static final SecureRandom SECURE_RANDOM = new SecureRandom();
+
 	public static void pay(Repository repository, String testSenderName, String testRecipientName, long amount) throws DataException {
 		PrivateKeyAccount sendingAccount = Common.getTestAccount(repository, testSenderName);
 		PrivateKeyAccount recipientAccount = Common.getTestAccount(repository, testRecipientName);
@@ -109,4 +117,30 @@ public class AccountUtils {
 		assertEquals(String.format("%s's %s [%d] balance incorrect", accountName, assetName, assetId), expectedBalance, actualBalance);
 	}
 
+
+	public static List<OnlineAccountData> generateOnlineAccounts(int numAccounts) {
+		List<OnlineAccountData> onlineAccounts = new ArrayList<>();
+
+		long timestamp = System.currentTimeMillis();
+		byte[] timestampBytes = Longs.toByteArray(timestamp);
+
+		final boolean mempowActive = timestamp >= BlockChain.getInstance().getOnlineAccountsMemoryPoWTimestamp();
+
+		for (int a = 0; a < numAccounts; ++a) {
+			byte[] privateKey = new byte[Transformer.PUBLIC_KEY_LENGTH];
+			SECURE_RANDOM.nextBytes(privateKey);
+
+			byte[] publicKey = new byte[Transformer.PUBLIC_KEY_LENGTH];
+			Qortal25519Extras.generatePublicKey(privateKey, 0, publicKey, 0);
+
+			byte[] signature = signForAggregation(privateKey, timestampBytes);
+
+			Integer nonce = mempowActive ? new Random().nextInt(500000) : null;
+
+			onlineAccounts.add(new OnlineAccountData(timestamp, signature, publicKey, nonce));
+		}
+
+		return onlineAccounts;
+	}
+
 }

src/test/java/org/qortal/test/minting/RewardTests.java

@@ -3,11 +3,9 @@ package org.qortal.test.minting;
 import static org.junit.Assert.*;
 
 import java.math.BigInteger;
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
+import java.util.*;
 
+import org.apache.commons.lang3.reflect.FieldUtils;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.junit.After;
@@ -15,7 +13,6 @@ import org.junit.Before;
 import org.junit.Test;
 import org.qortal.account.PrivateKeyAccount;
 import org.qortal.asset.Asset;
-import org.qortal.block.Block;
 import org.qortal.block.BlockChain;
 import org.qortal.block.BlockChain.RewardByHeight;
 import org.qortal.controller.BlockMinter;
@@ -111,7 +108,7 @@ public class RewardTests extends Common {
 	public void testLegacyQoraReward() throws DataException {
 		Common.useSettings("test-settings-v2-qora-holder-extremes.json");
 
-		long qoraHoldersShare = BlockChain.getInstance().getQoraHoldersShareAtHeight(1);
+		long qoraHoldersShare = BlockChain.getInstance().getQoraHoldersShare();
 		BigInteger qoraHoldersShareBI = BigInteger.valueOf(qoraHoldersShare);
 
 		long qoraPerQort = BlockChain.getInstance().getQoraPerQortReward();
@@ -192,47 +189,6 @@ public class RewardTests extends Common {
 		}
 	}
 
-	@Test
-	public void testLegacyQoraRewardReduction() throws DataException {
-		Common.useSettings("test-settings-v2-qora-holder-extremes.json");
-
-		// Make sure that the QORA share reduces between blocks 4 and 5
-		assertTrue(BlockChain.getInstance().getQoraHoldersShareAtHeight(5) < BlockChain.getInstance().getQoraHoldersShareAtHeight(4));
-
-		// Keep track of balance deltas at each height
-		Map<Integer, Long> chloeQortBalanceDeltaAtEachHeight = new HashMap<>();
-
-		try (final Repository repository = RepositoryManager.getRepository()) {
-			Map<String, Map<Long, Long>> initialBalances = AccountUtils.getBalances(repository, Asset.QORT, Asset.LEGACY_QORA, Asset.QORT_FROM_QORA);
-			long chloeLastQortBalance = initialBalances.get("chloe").get(Asset.QORT);
-
-			for (int i=2; i<=10; i++) {
-
-				Block block = BlockUtils.mintBlock(repository);
-
-				// Add to map of balance deltas at each height
-				long chloeNewQortBalance = AccountUtils.getBalance(repository, "chloe", Asset.QORT);
-				chloeQortBalanceDeltaAtEachHeight.put(block.getBlockData().getHeight(), chloeNewQortBalance - chloeLastQortBalance);
-				chloeLastQortBalance = chloeNewQortBalance;
-			}
-
-			// Ensure blocks 2-4 paid out the same rewards to Chloe
-			assertEquals(chloeQortBalanceDeltaAtEachHeight.get(2), chloeQortBalanceDeltaAtEachHeight.get(4));
-
-			// Ensure block 5 paid a lower reward
-			assertTrue(chloeQortBalanceDeltaAtEachHeight.get(5) < chloeQortBalanceDeltaAtEachHeight.get(4));
-
-			// Check that the reward was 20x lower
-			assertTrue(chloeQortBalanceDeltaAtEachHeight.get(5) == chloeQortBalanceDeltaAtEachHeight.get(4) / 20);
-
-			// Orphan to block 4 and ensure that Chloe's balance hasn't been incorrectly affected by the reward reduction
-			BlockUtils.orphanToBlock(repository, 4);
-			long expectedChloeQortBalance = initialBalances.get("chloe").get(Asset.QORT) + chloeQortBalanceDeltaAtEachHeight.get(2) +
-					chloeQortBalanceDeltaAtEachHeight.get(3) + chloeQortBalanceDeltaAtEachHeight.get(4);
-			assertEquals(expectedChloeQortBalance, AccountUtils.getBalance(repository, "chloe", Asset.QORT));
-		}
-	}
-
 	/** Use Alice-Chloe reward-share to bump Chloe from level 0 to level 1, then check orphaning works as expected. */
 	@Test
 	public void testLevel1() throws DataException {
@@ -338,7 +294,7 @@ public class RewardTests extends Common {
 			 * So Dilbert should receive 100% - legacy QORA holder's share.
 			 */
 
-			final long qoraHoldersShare = BlockChain.getInstance().getQoraHoldersShareAtHeight(1);
+			final long qoraHoldersShare = BlockChain.getInstance().getQoraHoldersShare();
 			final long remainingShare = 1_00000000 - qoraHoldersShare;
 
 			long dilbertExpectedBalance = initialBalances.get("dilbert").get(Asset.QORT);
@@ -745,6 +701,15 @@ public class RewardTests extends Common {
 			AccountUtils.assertBalance(repository, "chloe", Asset.QORT, chloeInitialBalance+expectedLevel7And8Reward);
 			AccountUtils.assertBalance(repository, "dilbert", Asset.QORT, dilbertInitialBalance+expectedLevel7And8Reward);
 
+			// Orphan and ensure balances return to their previous values
+			BlockUtils.orphanBlocks(repository, 1);
+
+			// Validate the balances
+			AccountUtils.assertBalance(repository, "alice", Asset.QORT, aliceInitialBalance);
+			AccountUtils.assertBalance(repository, "bob", Asset.QORT, bobInitialBalance);
+			AccountUtils.assertBalance(repository, "chloe", Asset.QORT, chloeInitialBalance);
+			AccountUtils.assertBalance(repository, "dilbert", Asset.QORT, dilbertInitialBalance);
+
 		}
 	}
 
@@ -830,6 +795,348 @@ public class RewardTests extends Common {
 			AccountUtils.assertBalance(repository, "chloe", Asset.QORT, chloeInitialBalance+expectedLevel9And10Reward);
 			AccountUtils.assertBalance(repository, "dilbert", Asset.QORT, dilbertInitialBalance+expectedLevel9And10Reward);
 
+			// Orphan and ensure balances return to their previous values
+			BlockUtils.orphanBlocks(repository, 1);
+
+			// Validate the balances
+			AccountUtils.assertBalance(repository, "alice", Asset.QORT, aliceInitialBalance);
+			AccountUtils.assertBalance(repository, "bob", Asset.QORT, bobInitialBalance);
+			AccountUtils.assertBalance(repository, "chloe", Asset.QORT, chloeInitialBalance);
+			AccountUtils.assertBalance(repository, "dilbert", Asset.QORT, dilbertInitialBalance);
+
+		}
+	}
+
+	/** Test rewards for level 7 and 8 accounts, when the tier doesn't yet have enough minters in it */
+	@Test
+	public void testLevel7And8RewardsPreActivation() throws DataException, IllegalAccessException {
+		Common.useSettings("test-settings-v2-reward-levels.json");
+
+		// Set minAccountsToActivateShareBin to 3 so that share bins 7-8 and 9-10 are considered inactive
+		FieldUtils.writeField(BlockChain.getInstance(), "minAccountsToActivateShareBin", 3, true);
+
+		try (final Repository repository = RepositoryManager.getRepository()) {
+
+			List<Integer> cumulativeBlocksByLevel = BlockChain.getInstance().getCumulativeBlocksByLevel();
+			List<PrivateKeyAccount> mintingAndOnlineAccounts = new ArrayList<>();
+
+			// Alice self share online
+			PrivateKeyAccount aliceSelfShare = Common.getTestAccount(repository, "alice-reward-share");
+			mintingAndOnlineAccounts.add(aliceSelfShare);
+
+			// Bob self-share NOT online
+
+			// Chloe self share online
+			byte[] chloeRewardSharePrivateKey = AccountUtils.rewardShare(repository, "chloe", "chloe", 0);
+			PrivateKeyAccount chloeRewardShareAccount = new PrivateKeyAccount(repository, chloeRewardSharePrivateKey);
+			mintingAndOnlineAccounts.add(chloeRewardShareAccount);
+
+			// Dilbert self share online
+			byte[] dilbertRewardSharePrivateKey = AccountUtils.rewardShare(repository, "dilbert", "dilbert", 0);
+			PrivateKeyAccount dilbertRewardShareAccount = new PrivateKeyAccount(repository, dilbertRewardSharePrivateKey);
+			mintingAndOnlineAccounts.add(dilbertRewardShareAccount);
+
+			// Mint enough blocks to bump testAccount levels to 7 and 8
+			final int minterBlocksNeeded = cumulativeBlocksByLevel.get(8) - 20; // 20 blocks before level 8, so that the test accounts reach the correct levels
+			for (int bc = 0; bc < minterBlocksNeeded; ++bc)
+				BlockMinter.mintTestingBlock(repository, mintingAndOnlineAccounts.toArray(new PrivateKeyAccount[0]));
+
+			// Ensure that the levels are as we expect
+			assertEquals(7, (int) Common.getTestAccount(repository, "alice").getLevel());
+			assertEquals(1, (int) Common.getTestAccount(repository, "bob").getLevel());
+			assertEquals(7, (int) Common.getTestAccount(repository, "chloe").getLevel());
+			assertEquals(8, (int) Common.getTestAccount(repository, "dilbert").getLevel());
+
+			// Now that everyone is at level 7 or 8 (except Bob who has only just started minting, so is at level 1), we can capture initial balances
+			Map<String, Map<Long, Long>> initialBalances = AccountUtils.getBalances(repository, Asset.QORT, Asset.LEGACY_QORA, Asset.QORT_FROM_QORA);
+			final long aliceInitialBalance = initialBalances.get("alice").get(Asset.QORT);
+			final long bobInitialBalance = initialBalances.get("bob").get(Asset.QORT);
+			final long chloeInitialBalance = initialBalances.get("chloe").get(Asset.QORT);
+			final long dilbertInitialBalance = initialBalances.get("dilbert").get(Asset.QORT);
+
+			// Mint a block
+			final long blockReward = BlockUtils.getNextBlockReward(repository);
+			BlockMinter.mintTestingBlock(repository, mintingAndOnlineAccounts.toArray(new PrivateKeyAccount[0]));
+
+			// Ensure we are using the correct block reward value
+			assertEquals(100000000L, blockReward);
+
+			/*
+			 * Alice, Chloe, and Dilbert are 'online'.
+			 * Chloe is level 7; Dilbert is level 8.
+			 * One founder online (Alice, who is also level 7).
+			 * No legacy QORA holders.
+			 *
+			 * Level 7 and 8 is not yet activated, so its rewards are added to the level 5 and 6 share bin.
+			 * There are no level 5 and 6 online.
+			 * Chloe and Dilbert should receive equal shares of the 35% block reward for levels 5 to 8.
+			 * Alice should receive the remainder (65%).
+			 */
+
+			final int level5To8SharePercent = 35_00; // 35% (combined 15% and 20%)
+			final long level5To8ShareAmount = (blockReward * level5To8SharePercent) / 100L / 100L;
+			final long expectedLevel5To8Reward = level5To8ShareAmount / 2; // The reward is split between Chloe and Dilbert
+			final long expectedFounderReward = blockReward - level5To8ShareAmount; // Alice should receive the remainder
+
+			// Validate the balances
+			AccountUtils.assertBalance(repository, "alice", Asset.QORT, aliceInitialBalance+expectedFounderReward);
+			AccountUtils.assertBalance(repository, "bob", Asset.QORT, bobInitialBalance); // Bob not online so his balance remains the same
+			AccountUtils.assertBalance(repository, "chloe", Asset.QORT, chloeInitialBalance+expectedLevel5To8Reward);
+			AccountUtils.assertBalance(repository, "dilbert", Asset.QORT, dilbertInitialBalance+expectedLevel5To8Reward);
+
+			// Orphan and ensure balances return to their previous values
+			BlockUtils.orphanBlocks(repository, 1);
+
+			// Validate the balances
+			AccountUtils.assertBalance(repository, "alice", Asset.QORT, aliceInitialBalance);
+			AccountUtils.assertBalance(repository, "bob", Asset.QORT, bobInitialBalance);
+			AccountUtils.assertBalance(repository, "chloe", Asset.QORT, chloeInitialBalance);
+			AccountUtils.assertBalance(repository, "dilbert", Asset.QORT, dilbertInitialBalance);
+
+		}
+	}
+
+	/** Test rewards for level 9 and 10 accounts, when the tier doesn't yet have enough minters in it.
+	 * Tier 7-8 isn't activated either, so the rewards and minters are all moved to tier 5-6. */
+	@Test
+	public void testLevel9And10RewardsPreActivation() throws DataException, IllegalAccessException {
+		Common.useSettings("test-settings-v2-reward-levels.json");
+
+		// Set minAccountsToActivateShareBin to 3 so that share bins 7-8 and 9-10 are considered inactive
+		FieldUtils.writeField(BlockChain.getInstance(), "minAccountsToActivateShareBin", 3, true);
+
+		try (final Repository repository = RepositoryManager.getRepository()) {
+
+			List<Integer> cumulativeBlocksByLevel = BlockChain.getInstance().getCumulativeBlocksByLevel();
+			List<PrivateKeyAccount> mintingAndOnlineAccounts = new ArrayList<>();
+
+			// Alice self share online
+			PrivateKeyAccount aliceSelfShare = Common.getTestAccount(repository, "alice-reward-share");
+			mintingAndOnlineAccounts.add(aliceSelfShare);
+
+			// Bob self-share not initially online
+
+			// Chloe self share online
+			byte[] chloeRewardSharePrivateKey = AccountUtils.rewardShare(repository, "chloe", "chloe", 0);
+			PrivateKeyAccount chloeRewardShareAccount = new PrivateKeyAccount(repository, chloeRewardSharePrivateKey);
+			mintingAndOnlineAccounts.add(chloeRewardShareAccount);
+
+			// Dilbert self share online
+			byte[] dilbertRewardSharePrivateKey = AccountUtils.rewardShare(repository, "dilbert", "dilbert", 0);
+			PrivateKeyAccount dilbertRewardShareAccount = new PrivateKeyAccount(repository, dilbertRewardSharePrivateKey);
+			mintingAndOnlineAccounts.add(dilbertRewardShareAccount);
+
+			// Mint enough blocks to bump testAccount levels to 9 and 10
+			final int minterBlocksNeeded = cumulativeBlocksByLevel.get(10) - 20; // 20 blocks before level 10, so that the test accounts reach the correct levels
+			for (int bc = 0; bc < minterBlocksNeeded; ++bc)
+				BlockMinter.mintTestingBlock(repository, mintingAndOnlineAccounts.toArray(new PrivateKeyAccount[0]));
+
+			// Bob self-share now comes online
+			byte[] bobRewardSharePrivateKey = AccountUtils.rewardShare(repository, "bob", "bob", 0);
+			PrivateKeyAccount bobRewardShareAccount = new PrivateKeyAccount(repository, bobRewardSharePrivateKey);
+			mintingAndOnlineAccounts.add(bobRewardShareAccount);
+
+			// Ensure that the levels are as we expect
+			assertEquals(9, (int) Common.getTestAccount(repository, "alice").getLevel());
+			assertEquals(1, (int) Common.getTestAccount(repository, "bob").getLevel());
+			assertEquals(9, (int) Common.getTestAccount(repository, "chloe").getLevel());
+			assertEquals(10, (int) Common.getTestAccount(repository, "dilbert").getLevel());
+
+			// Now that everyone is at level 7 or 8 (except Bob who has only just started minting, so is at level 1), we can capture initial balances
+			Map<String, Map<Long, Long>> initialBalances = AccountUtils.getBalances(repository, Asset.QORT, Asset.LEGACY_QORA, Asset.QORT_FROM_QORA);
+			final long aliceInitialBalance = initialBalances.get("alice").get(Asset.QORT);
+			final long bobInitialBalance = initialBalances.get("bob").get(Asset.QORT);
+			final long chloeInitialBalance = initialBalances.get("chloe").get(Asset.QORT);
+			final long dilbertInitialBalance = initialBalances.get("dilbert").get(Asset.QORT);
+
+			// Mint a block
+			final long blockReward = BlockUtils.getNextBlockReward(repository);
+			BlockMinter.mintTestingBlock(repository, mintingAndOnlineAccounts.toArray(new PrivateKeyAccount[0]));
+
+			// Ensure we are using the correct block reward value
+			assertEquals(100000000L, blockReward);
+
+			/*
+			 * Alice, Bob, Chloe, and Dilbert are 'online'.
+			 * Bob is level 1; Chloe is level 9; Dilbert is level 10.
+			 * One founder online (Alice, who is also level 9).
+			 * No legacy QORA holders.
+			 *
+			 * Levels 7+8, and 9+10 are not yet activated, so their rewards are added to the level 5 and 6 share bin.
+			 * There are no levels 5-8 online.
+			 * Chloe and Dilbert should receive equal shares of the 60% block reward for levels 5 to 10.
+			 * Alice should receive the remainder (40%).
+			 */
+
+			final int level1And2SharePercent = 5_00; // 5%
+			final int level5To10SharePercent = 60_00; // 60% (combined 15%, 20%, and 25%)
+			final long level1And2ShareAmount = (blockReward * level1And2SharePercent) / 100L / 100L;
+			final long level5To10ShareAmount = (blockReward * level5To10SharePercent) / 100L / 100L;
+			final long expectedLevel1And2Reward = level1And2ShareAmount; // The reward is given entirely to Bob
+			final long expectedLevel5To10Reward = level5To10ShareAmount / 2; // The reward is split between Chloe and Dilbert
+			final long expectedFounderReward = blockReward - level1And2ShareAmount - level5To10ShareAmount; // Alice should receive the remainder
+
+			// Validate the balances
+			AccountUtils.assertBalance(repository, "alice", Asset.QORT, aliceInitialBalance+expectedFounderReward);
+			AccountUtils.assertBalance(repository, "bob", Asset.QORT, bobInitialBalance+expectedLevel1And2Reward);
+			AccountUtils.assertBalance(repository, "chloe", Asset.QORT, chloeInitialBalance+expectedLevel5To10Reward);
+			AccountUtils.assertBalance(repository, "dilbert", Asset.QORT, dilbertInitialBalance+expectedLevel5To10Reward);
+
+			// Orphan and ensure balances return to their previous values
+			BlockUtils.orphanBlocks(repository, 1);
+
+			// Validate the balances
+			AccountUtils.assertBalance(repository, "alice", Asset.QORT, aliceInitialBalance);
+			AccountUtils.assertBalance(repository, "bob", Asset.QORT, bobInitialBalance);
+			AccountUtils.assertBalance(repository, "chloe", Asset.QORT, chloeInitialBalance);
+			AccountUtils.assertBalance(repository, "dilbert", Asset.QORT, dilbertInitialBalance);
+
+		}
+	}
+
+	/** Test rewards for level 7 and 8 accounts, when the tier reaches the minimum number of accounts */
+	@Test
+	public void testLevel7And8RewardsPreAndPostActivation() throws DataException, IllegalAccessException {
+		Common.useSettings("test-settings-v2-reward-levels.json");
+
+		// Set minAccountsToActivateShareBin to 2 so that share bins 7-8 and 9-10 are considered inactive at first
+		FieldUtils.writeField(BlockChain.getInstance(), "minAccountsToActivateShareBin", 2, true);
+
+		try (final Repository repository = RepositoryManager.getRepository()) {
+
+			List<Integer> cumulativeBlocksByLevel = BlockChain.getInstance().getCumulativeBlocksByLevel();
+			List<PrivateKeyAccount> mintingAndOnlineAccounts = new ArrayList<>();
+
+			// Alice self share online
+			PrivateKeyAccount aliceSelfShare = Common.getTestAccount(repository, "alice-reward-share");
+			mintingAndOnlineAccounts.add(aliceSelfShare);
+
+			// Bob self-share NOT online
+
+			// Chloe self share online
+			byte[] chloeRewardSharePrivateKey = AccountUtils.rewardShare(repository, "chloe", "chloe", 0);
+			PrivateKeyAccount chloeRewardShareAccount = new PrivateKeyAccount(repository, chloeRewardSharePrivateKey);
+			mintingAndOnlineAccounts.add(chloeRewardShareAccount);
+
+			// Dilbert self share online
+			byte[] dilbertRewardSharePrivateKey = AccountUtils.rewardShare(repository, "dilbert", "dilbert", 0);
+			PrivateKeyAccount dilbertRewardShareAccount = new PrivateKeyAccount(repository, dilbertRewardSharePrivateKey);
+			mintingAndOnlineAccounts.add(dilbertRewardShareAccount);
+
+			// Mint enough blocks to bump two of the testAccount levels to 7
+			final int minterBlocksNeeded = cumulativeBlocksByLevel.get(7) - 12; // 12 blocks before level 7, so that dilbert and alice have reached level 7, but chloe will reach it in the next 2 blocks
+			for (int bc = 0; bc < minterBlocksNeeded; ++bc)
+				BlockMinter.mintTestingBlock(repository, mintingAndOnlineAccounts.toArray(new PrivateKeyAccount[0]));
+
+			// Ensure that the levels are as we expect
+			assertEquals(7, (int) Common.getTestAccount(repository, "alice").getLevel());
+			assertEquals(1, (int) Common.getTestAccount(repository, "bob").getLevel());
+			assertEquals(6, (int) Common.getTestAccount(repository, "chloe").getLevel());
+			assertEquals(7, (int) Common.getTestAccount(repository, "dilbert").getLevel());
+
+			// Now that dilbert has reached level 7, we can capture initial balances
+			Map<String, Map<Long, Long>> initialBalances = AccountUtils.getBalances(repository, Asset.QORT, Asset.LEGACY_QORA, Asset.QORT_FROM_QORA);
+			final long aliceInitialBalance = initialBalances.get("alice").get(Asset.QORT);
+			final long bobInitialBalance = initialBalances.get("bob").get(Asset.QORT);
+			final long chloeInitialBalance = initialBalances.get("chloe").get(Asset.QORT);
+			final long dilbertInitialBalance = initialBalances.get("dilbert").get(Asset.QORT);
+
+			// Mint a block
+			long blockReward = BlockUtils.getNextBlockReward(repository);
+			BlockMinter.mintTestingBlock(repository, mintingAndOnlineAccounts.toArray(new PrivateKeyAccount[0]));
+
+			// Ensure we are using the correct block reward value
+			assertEquals(100000000L, blockReward);
+
+			/*
+			 * Alice, Chloe, and Dilbert are 'online'.
+			 * Chloe is level 6; Dilbert is level 7.
+			 * One founder online (Alice, who is also level 7).
+			 * No legacy QORA holders.
+			 *
+			 * Level 7 and 8 is not yet activated, so its rewards are added to the level 5 and 6 share bin.
+			 * There are no level 5 and 6 online.
+			 * Chloe and Dilbert should receive equal shares of the 35% block reward for levels 5 to 8.
+			 * Alice should receive the remainder (65%).
+			 */
+
+			final int level5To8SharePercent = 35_00; // 35% (combined 15% and 20%)
+			final long level5To8ShareAmount = (blockReward * level5To8SharePercent) / 100L / 100L;
+			final long expectedLevel5To8Reward = level5To8ShareAmount / 2; // The reward is split between Chloe and Dilbert
+			final long expectedFounderReward = blockReward - level5To8ShareAmount; // Alice should receive the remainder
+
+			// Validate the balances
+			AccountUtils.assertBalance(repository, "alice", Asset.QORT, aliceInitialBalance+expectedFounderReward);
+			AccountUtils.assertBalance(repository, "bob", Asset.QORT, bobInitialBalance); // Bob not online so his balance remains the same
+			AccountUtils.assertBalance(repository, "chloe", Asset.QORT, chloeInitialBalance+expectedLevel5To8Reward);
+			AccountUtils.assertBalance(repository, "dilbert", Asset.QORT, dilbertInitialBalance+expectedLevel5To8Reward);
+
+			// Ensure that the levels are as we expect
+			assertEquals(7, (int) Common.getTestAccount(repository, "alice").getLevel());
+			assertEquals(1, (int) Common.getTestAccount(repository, "bob").getLevel());
+			assertEquals(6, (int) Common.getTestAccount(repository, "chloe").getLevel());
+			assertEquals(7, (int) Common.getTestAccount(repository, "dilbert").getLevel());
+
+			// Capture pre-activation balances
+			Map<String, Map<Long, Long>> preActivationBalances = AccountUtils.getBalances(repository, Asset.QORT, Asset.LEGACY_QORA, Asset.QORT_FROM_QORA);
+			final long alicePreActivationBalance = preActivationBalances.get("alice").get(Asset.QORT);
+			final long bobPreActivationBalance = preActivationBalances.get("bob").get(Asset.QORT);
+			final long chloePreActivationBalance = preActivationBalances.get("chloe").get(Asset.QORT);
+			final long dilbertPreActivationBalance = preActivationBalances.get("dilbert").get(Asset.QORT);
+
+			// Mint another block
+			blockReward = BlockUtils.getNextBlockReward(repository);
+			BlockMinter.mintTestingBlock(repository, mintingAndOnlineAccounts.toArray(new PrivateKeyAccount[0]));
+
+			// Ensure that the levels are as we expect (chloe has now increased to level 7; level 7-8 is now activated)
+			assertEquals(7, (int) Common.getTestAccount(repository, "alice").getLevel());
+			assertEquals(1, (int) Common.getTestAccount(repository, "bob").getLevel());
+			assertEquals(7, (int) Common.getTestAccount(repository, "chloe").getLevel());
+			assertEquals(7, (int) Common.getTestAccount(repository, "dilbert").getLevel());
+
+			/*
+			 * Alice, Chloe, and Dilbert are 'online'.
+			 * Chloe and Dilbert are level 7.
+			 * One founder online (Alice, who is also level 7).
+			 * No legacy QORA holders.
+			 *
+			 * Level 7 and 8 is now activated, so its rewards are paid out in the normal way.
+			 * There are no level 5 and 6 online.
+			 * Chloe and Dilbert should receive equal shares of the 20% block reward for levels 7 to 8.
+			 * Alice should receive the remainder (80%).
+			 */
+
+			final int level7To8SharePercent = 20_00; // 20%
+			final long level7To8ShareAmount = (blockReward * level7To8SharePercent) / 100L / 100L;
+			final long expectedLevel7To8Reward = level7To8ShareAmount / 2; // The reward is split between Chloe and Dilbert
+			final long newExpectedFounderReward = blockReward - level7To8ShareAmount; // Alice should receive the remainder
+
+			// Validate the balances
+			AccountUtils.assertBalance(repository, "alice", Asset.QORT, alicePreActivationBalance+newExpectedFounderReward);
+			AccountUtils.assertBalance(repository, "bob", Asset.QORT, bobPreActivationBalance); // Bob not online so his balance remains the same
+			AccountUtils.assertBalance(repository, "chloe", Asset.QORT, chloePreActivationBalance+expectedLevel7To8Reward);
+			AccountUtils.assertBalance(repository, "dilbert", Asset.QORT, dilbertPreActivationBalance+expectedLevel7To8Reward);
+
+
+			// Orphan and ensure balances return to their pre-activation values
+			BlockUtils.orphanBlocks(repository, 1);
+
+			// Validate the balances
+			AccountUtils.assertBalance(repository, "alice", Asset.QORT, alicePreActivationBalance);
+			AccountUtils.assertBalance(repository, "bob", Asset.QORT, bobPreActivationBalance);
+			AccountUtils.assertBalance(repository, "chloe", Asset.QORT, chloePreActivationBalance);
+			AccountUtils.assertBalance(repository, "dilbert", Asset.QORT, dilbertPreActivationBalance);
+
+
+			// Orphan again and ensure balances return to their initial values
+			BlockUtils.orphanBlocks(repository, 1);
+
+			// Validate the balances
+			AccountUtils.assertBalance(repository, "alice", Asset.QORT, aliceInitialBalance);
+			AccountUtils.assertBalance(repository, "bob", Asset.QORT, bobInitialBalance);
+			AccountUtils.assertBalance(repository, "chloe", Asset.QORT, chloeInitialBalance);
+			AccountUtils.assertBalance(repository, "dilbert", Asset.QORT, dilbertInitialBalance);
+
 		}
 	}
 

src/test/java/org/qortal/test/network/OnlineAccountsTests.java

@@ -1,22 +1,39 @@
 package org.qortal.test.network;
 
+import com.google.common.primitives.Ints;
+import io.druid.extendedset.intset.ConciseSet;
+import org.apache.commons.lang3.reflect.FieldUtils;
 import org.bouncycastle.jce.provider.BouncyCastleProvider;
 import org.bouncycastle.jsse.provider.BouncyCastleJsseProvider;
+import org.junit.Before;
+import org.junit.Ignore;
 import org.junit.Test;
+import org.qortal.block.Block;
+import org.qortal.block.BlockChain;
+import org.qortal.controller.BlockMinter;
 import org.qortal.data.network.OnlineAccountData;
 import org.qortal.network.message.*;
+import org.qortal.repository.DataException;
+import org.qortal.repository.Repository;
+import org.qortal.repository.RepositoryManager;
+import org.qortal.settings.Settings;
+import org.qortal.test.common.AccountUtils;
+import org.qortal.test.common.Common;
 import org.qortal.transform.Transformer;
+import org.qortal.utils.Base58;
+import org.qortal.utils.NTP;
 
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
 import java.nio.ByteBuffer;
 import java.security.Security;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Random;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.*;
 
-public class OnlineAccountsTests {
+public class OnlineAccountsTests extends Common {
 
     private static final Random RANDOM = new Random();
     static {
@@ -27,6 +44,12 @@ public class OnlineAccountsTests {
         Security.insertProviderAt(new BouncyCastleJsseProvider(), 1);
     }
 
+    @Before
+    public void beforeTest() throws DataException, IOException {
+        Common.useSettingsAndDb("test-settings-v2-no-sig-agg.json", false);
+        NTP.setFixedOffset(Settings.getInstance().getTestNtpOffset());
+    }
+
 
     @Test
     public void testGetOnlineAccountsV2() throws MessageException {
@@ -111,4 +134,102 @@ public class OnlineAccountsTests {
         return onlineAccounts;
     }
 
+    @Test
+    public void testOnlineAccountsModulusV1() throws IllegalAccessException, DataException {
+        try (final Repository repository = RepositoryManager.getRepository()) {
+
+            // Set feature trigger timestamp to MAX long so that it is inactive
+            FieldUtils.writeField(BlockChain.getInstance(), "onlineAccountsModulusV2Timestamp", Long.MAX_VALUE, true);
+
+            List<String> onlineAccountSignatures = new ArrayList<>();
+            long fakeNTPOffset = 0L;
+
+            // Mint a block and store its timestamp
+            Block block = BlockMinter.mintTestingBlock(repository, Common.getTestAccount(repository, "alice-reward-share"));
+            long lastBlockTimestamp = block.getBlockData().getTimestamp();
+
+            // Mint some blocks and keep track of the different online account signatures
+            for (int i = 0; i < 30; i++) {
+                block = BlockMinter.mintTestingBlock(repository, Common.getTestAccount(repository, "alice-reward-share"));
+
+                // Increase NTP fixed offset by the block time, to simulate time passing
+                long blockTimeDelta = block.getBlockData().getTimestamp() - lastBlockTimestamp;
+                lastBlockTimestamp = block.getBlockData().getTimestamp();
+                fakeNTPOffset += blockTimeDelta;
+                NTP.setFixedOffset(fakeNTPOffset);
+
+                String lastOnlineAccountSignatures58 = Base58.encode(block.getBlockData().getOnlineAccountsSignatures());
+                if (!onlineAccountSignatures.contains(lastOnlineAccountSignatures58)) {
+                    onlineAccountSignatures.add(lastOnlineAccountSignatures58);
+                }
+            }
+
+            // We expect at least 6 unique signatures over 30 blocks (generally 6-8, but could be higher due to block time differences)
+            System.out.println(String.format("onlineAccountSignatures count: %d", onlineAccountSignatures.size()));
+            assertTrue(onlineAccountSignatures.size() >= 6);
+        }
+    }
+
+    @Test
+    public void testOnlineAccountsModulusV2() throws IllegalAccessException, DataException {
+        try (final Repository repository = RepositoryManager.getRepository()) {
+
+            // Set feature trigger timestamp to 0 so that it is active
+            FieldUtils.writeField(BlockChain.getInstance(), "onlineAccountsModulusV2Timestamp", 0L, true);
+
+            List<String> onlineAccountSignatures = new ArrayList<>();
+            long fakeNTPOffset = 0L;
+
+            // Mint a block and store its timestamp
+            Block block = BlockMinter.mintTestingBlock(repository, Common.getTestAccount(repository, "alice-reward-share"));
+            long lastBlockTimestamp = block.getBlockData().getTimestamp();
+
+            // Mint some blocks and keep track of the different online account signatures
+            for (int i = 0; i < 30; i++) {
+                block = BlockMinter.mintTestingBlock(repository, Common.getTestAccount(repository, "alice-reward-share"));
+
+                // Increase NTP fixed offset by the block time, to simulate time passing
+                long blockTimeDelta = block.getBlockData().getTimestamp() - lastBlockTimestamp;
+                lastBlockTimestamp = block.getBlockData().getTimestamp();
+                fakeNTPOffset += blockTimeDelta;
+                NTP.setFixedOffset(fakeNTPOffset);
+
+                String lastOnlineAccountSignatures58 = Base58.encode(block.getBlockData().getOnlineAccountsSignatures());
+                if (!onlineAccountSignatures.contains(lastOnlineAccountSignatures58)) {
+                    onlineAccountSignatures.add(lastOnlineAccountSignatures58);
+                }
+            }
+
+            // We expect 1-3 unique signatures over 30 blocks
+            System.out.println(String.format("onlineAccountSignatures count: %d", onlineAccountSignatures.size()));
+            assertTrue(onlineAccountSignatures.size() >= 1 && onlineAccountSignatures.size() <= 3);
+        }
+    }
+
+    @Test
+    @Ignore(value = "For informational use")
+    public void testOnlineAccountNonceCompression() throws IOException {
+        List<OnlineAccountData> onlineAccounts = AccountUtils.generateOnlineAccounts(5000);
+
+        // Build array of nonce values
+        List<Integer> accountNonces = new ArrayList<>();
+        for (OnlineAccountData onlineAccountData : onlineAccounts) {
+            accountNonces.add(onlineAccountData.getNonce());
+        }
+
+        // Write nonces into ConciseSet
+        ConciseSet nonceSet = new ConciseSet();
+        nonceSet = nonceSet.convert(accountNonces);
+        byte[] conciseEncodedNonces = nonceSet.toByteBuffer().array();
+
+        // Also write to regular byte array of ints, for comparison
+        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
+        for (Integer nonce : accountNonces) {
+            bytes.write(Ints.toByteArray(nonce));
+        }
+        byte[] standardEncodedNonces = bytes.toByteArray();
+
+        System.out.println(String.format("Standard: %d", standardEncodedNonces.length));
+        System.out.println(String.format("Concise: %d", conciseEncodedNonces.length));
+    }
 }

src/test/resources/test-chain-v2-block-timestamps.json

@@ -20,17 +20,16 @@
 		{ "height": 21, "reward": 1 }
 	],
 	"sharesByLevel": [
-		{ "levels": [ 1, 2 ], "share": 0.05 },
-		{ "levels": [ 3, 4 ], "share": 0.10 },
-		{ "levels": [ 5, 6 ], "share": 0.15 },
-		{ "levels": [ 7, 8 ], "share": 0.20 },
-		{ "levels": [ 9, 10 ], "share": 0.25 }
-	],
-	"qoraHoldersShareByHeight": [
-		{ "height": 1, "share": 0.20 },
-		{ "height": 1000000, "share": 0.01 }
+		{ "id": 1, "levels": [ 1, 2 ], "share": 0.05 },
+		{ "id": 2, "levels": [ 3, 4 ], "share": 0.10 },
+		{ "id": 3, "levels": [ 5, 6 ], "share": 0.15 },
+		{ "id": 4, "levels": [ 7, 8 ], "share": 0.20 },
+		{ "id": 5, "levels": [ 9, 10 ], "share": 0.25 }
 	],
+	"qoraHoldersShare": 0.20,
 	"qoraPerQortReward": 250,
+	"minAccountsToActivateShareBin": 30,
+	"shareBinActivationMinLevel": 7,
 	"blocksNeededByLevel": [ 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 ],
 	"blockTimingsByHeight": [
 		{ "height": 1, "target": 60000, "deviation": 30000, "power": 0.2 },

src/test/resources/test-chain-v2-disable-reference.json

@@ -24,17 +24,16 @@
 		{ "height": 21, "reward": 1 }
 	],
 	"sharesByLevel": [
-		{ "levels": [ 1, 2 ], "share": 0.05 },
-		{ "levels": [ 3, 4 ], "share": 0.10 },
-		{ "levels": [ 5, 6 ], "share": 0.15 },
-		{ "levels": [ 7, 8 ], "share": 0.20 },
-		{ "levels": [ 9, 10 ], "share": 0.25 }
-	],
-	"qoraHoldersShareByHeight": [
-		{ "height": 1, "share": 0.20 },
-		{ "height": 1000000, "share": 0.01 }
+		{ "id": 1, "levels": [ 1, 2 ], "share": 0.05 },
+		{ "id": 2, "levels": [ 3, 4 ], "share": 0.10 },
+		{ "id": 3, "levels": [ 5, 6 ], "share": 0.15 },
+		{ "id": 4, "levels": [ 7, 8 ], "share": 0.20 },
+		{ "id": 5, "levels": [ 9, 10 ], "share": 0.25 }
 	],
+	"qoraHoldersShare": 0.20,
 	"qoraPerQortReward": 250,
+	"minAccountsToActivateShareBin": 30,
+	"shareBinActivationMinLevel": 7,
 	"blocksNeededByLevel": [ 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 ],
 	"blockTimingsByHeight": [
 		{ "height": 1, "target": 60000, "deviation": 30000, "power": 0.2 }

src/test/resources/test-chain-v2-founder-rewards.json

@@ -18,23 +18,23 @@
 	"founderEffectiveMintingLevel": 10,
 	"onlineAccountSignaturesMinLifetime": 3600000,
 	"onlineAccountSignaturesMaxLifetime": 86400000,
+	"onlineAccountsModulusV2Timestamp": 9999999999999,
 	"rewardsByHeight": [
 		{ "height": 1, "reward": 100 },
 		{ "height": 11, "reward": 10 },
 		{ "height": 21, "reward": 1 }
 	],
 	"sharesByLevel": [
-		{ "levels": [ 1, 2 ], "share": 0.05 },
-		{ "levels": [ 3, 4 ], "share": 0.10 },
-		{ "levels": [ 5, 6 ], "share": 0.15 },
-		{ "levels": [ 7, 8 ], "share": 0.20 },
-		{ "levels": [ 9, 10 ], "share": 0.25 }
-	],
-	"qoraHoldersShareByHeight": [
-		{ "height": 1, "share": 0.20 },
-		{ "height": 1000000, "share": 0.01 }
+		{ "id": 1, "levels": [ 1, 2 ], "share": 0.05 },
+		{ "id": 2, "levels": [ 3, 4 ], "share": 0.10 },
+		{ "id": 3, "levels": [ 5, 6 ], "share": 0.15 },
+		{ "id": 4, "levels": [ 7, 8 ], "share": 0.20 },
+		{ "id": 5, "levels": [ 9, 10 ], "share": 0.25 }
 	],
+	"qoraHoldersShare": 0.20,
 	"qoraPerQortReward": 250,
+	"minAccountsToActivateShareBin": 30,
+	"shareBinActivationMinLevel": 7,
 	"blocksNeededByLevel": [ 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 ],
 	"blockTimingsByHeight": [
 		{ "height": 1, "target": 60000, "deviation": 30000, "power": 0.2 }

src/test/resources/test-chain-v2-leftover-reward.json

@@ -18,23 +18,23 @@
 	"founderEffectiveMintingLevel": 10,
 	"onlineAccountSignaturesMinLifetime": 3600000,
 	"onlineAccountSignaturesMaxLifetime": 86400000,
+	"onlineAccountsModulusV2Timestamp": 9999999999999,
 	"rewardsByHeight": [
 		{ "height": 1, "reward": 100 },
 		{ "height": 11, "reward": 10 },
 		{ "height": 21, "reward": 1 }
 	],
 	"sharesByLevel": [
-		{ "levels": [ 1, 2 ], "share": 0.05 },
-		{ "levels": [ 3, 4 ], "share": 0.10 },
-		{ "levels": [ 5, 6 ], "share": 0.15 },
-		{ "levels": [ 7, 8 ], "share": 0.20 },
-		{ "levels": [ 9, 10 ], "share": 0.25 }
-	],
-	"qoraHoldersShareByHeight": [
-		{ "height": 1, "share": 0.20 },
-		{ "height": 1000000, "share": 0.01 }
+		{ "id": 1, "levels": [ 1, 2 ], "share": 0.05 },
+		{ "id": 2, "levels": [ 3, 4 ], "share": 0.10 },
+		{ "id": 3, "levels": [ 5, 6 ], "share": 0.15 },
+		{ "id": 4, "levels": [ 7, 8 ], "share": 0.20 },
+		{ "id": 5, "levels": [ 9, 10 ], "share": 0.25 }
 	],
+	"qoraHoldersShare": 0.20,
 	"qoraPerQortReward": 250,
+	"minAccountsToActivateShareBin": 30,
+	"shareBinActivationMinLevel": 7,
 	"blocksNeededByLevel": [ 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 ],
 	"blockTimingsByHeight": [
 		{ "height": 1, "target": 60000, "deviation": 30000, "power": 0.2 }

src/test/resources/test-chain-v2-minting.json

@@ -18,23 +18,23 @@
 	"founderEffectiveMintingLevel": 10,
 	"onlineAccountSignaturesMinLifetime": 3600000,
 	"onlineAccountSignaturesMaxLifetime": 86400000,
+	"onlineAccountsModulusV2Timestamp": 9999999999999,
 	"rewardsByHeight": [
 		{ "height": 1, "reward": 100 },
 		{ "height": 11, "reward": 10 },
 		{ "height": 21, "reward": 1 }
 	],
 	"sharesByLevel": [
-		{ "levels": [ 1, 2 ], "share": 0.05 },
-		{ "levels": [ 3, 4 ], "share": 0.10 },
-		{ "levels": [ 5, 6 ], "share": 0.15 },
-		{ "levels": [ 7, 8 ], "share": 0.20 },
-		{ "levels": [ 9, 10 ], "share": 0.25 }
-	],
-	"qoraHoldersShareByHeight": [
-		{ "height": 1, "share": 0.20 },
-		{ "height": 1000000, "share": 0.01 }
+		{ "id": 1, "levels": [ 1, 2 ], "share": 0.05 },
+		{ "id": 2, "levels": [ 3, 4 ], "share": 0.10 },
+		{ "id": 3, "levels": [ 5, 6 ], "share": 0.15 },
+		{ "id": 4, "levels": [ 7, 8 ], "share": 0.20 },
+		{ "id": 5, "levels": [ 9, 10 ], "share": 0.25 }
 	],
+	"qoraHoldersShare": 0.20,
 	"qoraPerQortReward": 250,
+	"minAccountsToActivateShareBin": 30,
+	"shareBinActivationMinLevel": 7,
 	"blocksNeededByLevel": [ 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 ],
 	"blockTimingsByHeight": [
 		{ "height": 1, "target": 60000, "deviation": 30000, "power": 0.2 }

src/test/resources/test-chain-v2-no-sig-agg.json

@@ -0,0 +1,87 @@
+{
+	"isTestChain": true,
+	"blockTimestampMargin": 500,
+	"transactionExpiryPeriod": 86400000,
+	"maxBlockSize": 2097152,
+	"maxBytesPerUnitFee": 1024,
+	"unitFee": "0.1",
+	"nameRegistrationUnitFees": [
+		{ "timestamp": 1645372800000, "fee": "5" }
+	],
+	"requireGroupForApproval": false,
+	"minAccountLevelToRewardShare": 5,
+	"maxRewardSharesPerMintingAccount": 20,
+	"founderEffectiveMintingLevel": 10,
+	"onlineAccountSignaturesMinLifetime": 3600000,
+	"onlineAccountSignaturesMaxLifetime": 86400000,
+	"onlineAccountsModulusV2Timestamp": 9999999999999,
+	"rewardsByHeight": [
+		{ "height": 1, "reward": 100 },
+		{ "height": 11, "reward": 10 },
+		{ "height": 21, "reward": 1 }
+	],
+	"sharesByLevel": [
+		{ "levels": [ 1, 2 ], "share": 0.05 },
+		{ "levels": [ 3, 4 ], "share": 0.10 },
+		{ "levels": [ 5, 6 ], "share": 0.15 },
+		{ "levels": [ 7, 8 ], "share": 0.20 },
+		{ "levels": [ 9, 10 ], "share": 0.25 }
+	],
+	"qoraHoldersShare": 0.20,
+	"qoraPerQortReward": 250,
+	"blocksNeededByLevel": [ 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 ],
+	"blockTimingsByHeight": [
+		{ "height": 1, "target": 60000, "deviation": 30000, "power": 0.2 }
+	],
+	"ciyamAtSettings": {
+		"feePerStep": "0.0001",
+		"maxStepsPerRound": 500,
+		"stepsPerFunctionCall": 10,
+		"minutesPerBlock": 1
+	},
+	"featureTriggers": {
+		"messageHeight": 0,
+		"atHeight": 0,
+		"assetsTimestamp": 0,
+		"votingTimestamp": 0,
+		"arbitraryTimestamp": 0,
+		"powfixTimestamp": 0,
+		"qortalTimestamp": 0,
+		"newAssetPricingTimestamp": 0,
+		"groupApprovalTimestamp": 0,
+		"atFindNextTransactionFix": 0,
+		"newBlockSigHeight": 999999,
+		"shareBinFix": 999999,
+		"rewardShareLimitTimestamp": 9999999999999,
+		"calcChainWeightTimestamp": 0,
+		"transactionV5Timestamp": 0,
+		"transactionV6Timestamp": 0,
+		"disableReferenceTimestamp": 9999999999999,
+		"aggregateSignatureTimestamp": 9999999999999
+	},
+	"genesisInfo": {
+		"version": 4,
+		"timestamp": 0,
+		"transactions": [
+			{ "type": "ISSUE_ASSET", "assetName": "QORT", "description": "QORT native coin", "data": "", "quantity": 0, "isDivisible": true, "fee": 0 },
+			{ "type": "ISSUE_ASSET", "assetName": "Legacy-QORA", "description": "Representative legacy QORA", "quantity": 0, "isDivisible": true, "data": "{}", "isUnspendable": true },
+			{ "type": "ISSUE_ASSET", "assetName": "QORT-from-QORA", "description": "QORT gained from holding legacy QORA", "quantity": 0, "isDivisible": true, "data": "{}", "isUnspendable": true },
+
+			{ "type": "GENESIS", "recipient": "QgV4s3xnzLhVBEJxcYui4u4q11yhUHsd9v", "amount": "1000000000" },
+			{ "type": "GENESIS", "recipient": "QixPbJUwsaHsVEofJdozU9zgVqkK6aYhrK", "amount": "1000000" },
+			{ "type": "GENESIS", "recipient": "QaUpHNhT3Ygx6avRiKobuLdusppR5biXjL", "amount": "1000000" },
+			{ "type": "GENESIS", "recipient": "Qci5m9k4rcwe4ruKrZZQKka4FzUUMut3er", "amount": "1000000" },
+
+			{ "type": "CREATE_GROUP", "creatorPublicKey": "2tiMr5LTpaWCgbRvkPK8TFd7k63DyHJMMFFsz9uBf1ZP", "groupName": "dev-group", "description": "developer group", "isOpen": false, "approvalThreshold": "PCT100", "minimumBlockDelay": 0, "maximumBlockDelay": 1440 },
+
+			{ "type": "ISSUE_ASSET", "issuerPublicKey": "2tiMr5LTpaWCgbRvkPK8TFd7k63DyHJMMFFsz9uBf1ZP", "assetName": "TEST", "description": "test asset", "data": "", "quantity": "1000000", "isDivisible": true, "fee": 0 },
+			{ "type": "ISSUE_ASSET", "issuerPublicKey": "C6wuddsBV3HzRrXUtezE7P5MoRXp5m3mEDokRDGZB6ry", "assetName": "OTHER", "description": "other test asset", "data": "", "quantity": "1000000", "isDivisible": true, "fee": 0 },
+			{ "type": "ISSUE_ASSET", "issuerPublicKey": "2tiMr5LTpaWCgbRvkPK8TFd7k63DyHJMMFFsz9uBf1ZP", "assetName": "GOLD", "description": "gold test asset", "data": "", "quantity": "1000000", "isDivisible": true, "fee": 0 },
+
+			{ "type": "ACCOUNT_FLAGS", "target": "QgV4s3xnzLhVBEJxcYui4u4q11yhUHsd9v", "andMask": -1, "orMask": 1, "xorMask": 0 },
+			{ "type": "REWARD_SHARE", "minterPublicKey": "2tiMr5LTpaWCgbRvkPK8TFd7k63DyHJMMFFsz9uBf1ZP", "recipient": "QgV4s3xnzLhVBEJxcYui4u4q11yhUHsd9v", "rewardSharePublicKey": "7PpfnvLSG7y4HPh8hE7KoqAjLCkv7Ui6xw4mKAkbZtox", "sharePercent": "100" },
+
+			{ "type": "ACCOUNT_LEVEL", "target": "Qci5m9k4rcwe4ruKrZZQKka4FzUUMut3er", "level": 5 }
+		]
+	}
+}

src/test/resources/test-chain-v2-qora-holder-extremes.json

@@ -18,23 +18,23 @@
 	"founderEffectiveMintingLevel": 10,
 	"onlineAccountSignaturesMinLifetime": 3600000,
 	"onlineAccountSignaturesMaxLifetime": 86400000,
+	"onlineAccountsModulusV2Timestamp": 9999999999999,
 	"rewardsByHeight": [
 		{ "height": 1, "reward": 100 },
 		{ "height": 11, "reward": 10 },
 		{ "height": 21, "reward": 1 }
 	],
 	"sharesByLevel": [
-		{ "levels": [ 1, 2 ], "share": 0.05 },
-		{ "levels": [ 3, 4 ], "share": 0.10 },
-		{ "levels": [ 5, 6 ], "share": 0.15 },
-		{ "levels": [ 7, 8 ], "share": 0.20 },
-		{ "levels": [ 9, 10 ], "share": 0.25 }
-	],
-	"qoraHoldersShareByHeight": [
-		{ "height": 1, "share": 0.20 },
-		{ "height": 5, "share": 0.01 }
+		{ "id": 1, "levels": [ 1, 2 ], "share": 0.05 },
+		{ "id": 2, "levels": [ 3, 4 ], "share": 0.10 },
+		{ "id": 3, "levels": [ 5, 6 ], "share": 0.15 },
+		{ "id": 4, "levels": [ 7, 8 ], "share": 0.20 },
+		{ "id": 5, "levels": [ 9, 10 ], "share": 0.25 }
 	],
+	"qoraHoldersShare": 0.20,
 	"qoraPerQortReward": 250,
+	"minAccountsToActivateShareBin": 30,
+	"shareBinActivationMinLevel": 7,
 	"blocksNeededByLevel": [ 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 ],
 	"blockTimingsByHeight": [
 		{ "height": 1, "target": 60000, "deviation": 30000, "power": 0.2 }

src/test/resources/test-chain-v2-qora-holder.json

@@ -18,23 +18,23 @@
 	"founderEffectiveMintingLevel": 10,
 	"onlineAccountSignaturesMinLifetime": 3600000,
 	"onlineAccountSignaturesMaxLifetime": 86400000,
+	"onlineAccountsModulusV2Timestamp": 9999999999999,
 	"rewardsByHeight": [
 		{ "height": 1, "reward": 100 },
 		{ "height": 11, "reward": 10 },
 		{ "height": 21, "reward": 1 }
 	],
 	"sharesByLevel": [
-		{ "levels": [ 1, 2 ], "share": 0.05 },
-		{ "levels": [ 3, 4 ], "share": 0.10 },
-		{ "levels": [ 5, 6 ], "share": 0.15 },
-		{ "levels": [ 7, 8 ], "share": 0.20 },
-		{ "levels": [ 9, 10 ], "share": 0.25 }
-	],
-	"qoraHoldersShareByHeight": [
-		{ "height": 1, "share": 0.20 },
-		{ "height": 1000000, "share": 0.01 }
+		{ "id": 1, "levels": [ 1, 2 ], "share": 0.05 },
+		{ "id": 2, "levels": [ 3, 4 ], "share": 0.10 },
+		{ "id": 3, "levels": [ 5, 6 ], "share": 0.15 },
+		{ "id": 4, "levels": [ 7, 8 ], "share": 0.20 },
+		{ "id": 5, "levels": [ 9, 10 ], "share": 0.25 }
 	],
+	"qoraHoldersShare": 0.20,
 	"qoraPerQortReward": 250,
+	"minAccountsToActivateShareBin": 30,
+	"shareBinActivationMinLevel": 7,
 	"blocksNeededByLevel": [ 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 ],
 	"blockTimingsByHeight": [
 		{ "height": 1, "target": 60000, "deviation": 30000, "power": 0.2 }

src/test/resources/test-chain-v2-reward-levels.json

@@ -18,23 +18,23 @@
 	"founderEffectiveMintingLevel": 10,
 	"onlineAccountSignaturesMinLifetime": 3600000,
 	"onlineAccountSignaturesMaxLifetime": 86400000,
+	"onlineAccountsModulusV2Timestamp": 9999999999999,
 	"rewardsByHeight": [
 		{ "height": 1, "reward": 100 },
 		{ "height": 11, "reward": 10 },
 		{ "height": 21, "reward": 1 }
 	],
 	"sharesByLevel": [
-		{ "levels": [ 1, 2 ], "share": 0.05 },
-		{ "levels": [ 3, 4 ], "share": 0.10 },
-		{ "levels": [ 5, 6 ], "share": 0.15 },
-		{ "levels": [ 7, 8 ], "share": 0.20 },
-		{ "levels": [ 9, 10 ], "share": 0.25 }
-	],
-	"qoraHoldersShareByHeight": [
-		{ "height": 1, "share": 0.20 },
-		{ "height": 1000000, "share": 0.01 }
+		{ "id": 1, "levels": [ 1, 2 ], "share": 0.05 },
+		{ "id": 2, "levels": [ 3, 4 ], "share": 0.10 },
+		{ "id": 3, "levels": [ 5, 6 ], "share": 0.15 },
+		{ "id": 4, "levels": [ 7, 8 ], "share": 0.20 },
+		{ "id": 5, "levels": [ 9, 10 ], "share": 0.25 }
 	],
+	"qoraHoldersShare": 0.20,
 	"qoraPerQortReward": 250,
+	"minAccountsToActivateShareBin": 1,
+	"shareBinActivationMinLevel": 7,
 	"blocksNeededByLevel": [ 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 ],
 	"blockTimingsByHeight": [
 		{ "height": 1, "target": 60000, "deviation": 30000, "power": 0.2 }

src/test/resources/test-chain-v2-reward-scaling.json

@@ -18,23 +18,23 @@
 	"founderEffectiveMintingLevel": 10,
 	"onlineAccountSignaturesMinLifetime": 3600000,
 	"onlineAccountSignaturesMaxLifetime": 86400000,
+	"onlineAccountsModulusV2Timestamp": 9999999999999,
 	"rewardsByHeight": [
 		{ "height": 1, "reward": 100 },
 		{ "height": 11, "reward": 10 },
 		{ "height": 21, "reward": 1 }
 	],
 	"sharesByLevel": [
-		{ "levels": [ 1, 2 ], "share": 0.05 },
-		{ "levels": [ 3, 4 ], "share": 0.10 },
-		{ "levels": [ 5, 6 ], "share": 0.15 },
-		{ "levels": [ 7, 8 ], "share": 0.20 },
-		{ "levels": [ 9, 10 ], "share": 0.25 }
-	],
-	"qoraHoldersShareByHeight": [
-		{ "height": 1, "share": 0.20 },
-		{ "height": 1000000, "share": 0.01 }
+		{ "id": 1, "levels": [ 1, 2 ], "share": 0.05 },
+		{ "id": 2, "levels": [ 3, 4 ], "share": 0.10 },
+		{ "id": 3, "levels": [ 5, 6 ], "share": 0.15 },
+		{ "id": 4, "levels": [ 7, 8 ], "share": 0.20 },
+		{ "id": 5, "levels": [ 9, 10 ], "share": 0.25 }
 	],
+	"qoraHoldersShare": 0.20,
 	"qoraPerQortReward": 250,
+	"minAccountsToActivateShareBin": 30,
+	"shareBinActivationMinLevel": 7,
 	"blocksNeededByLevel": [ 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 ],
 	"blockTimingsByHeight": [
 		{ "height": 1, "target": 60000, "deviation": 30000, "power": 0.2 }

src/test/resources/test-chain-v2-reward-shares.json

@@ -24,17 +24,16 @@
 		{ "height": 21, "reward": 1 }
 	],
 	"sharesByLevel": [
-		{ "levels": [ 1, 2 ], "share": 0.05 },
-		{ "levels": [ 3, 4 ], "share": 0.10 },
-		{ "levels": [ 5, 6 ], "share": 0.15 },
-		{ "levels": [ 7, 8 ], "share": 0.20 },
-		{ "levels": [ 9, 10 ], "share": 0.25 }
-	],
-	"qoraHoldersShareByHeight": [
-		{ "height": 1, "share": 0.20 },
-		{ "height": 1000000, "share": 0.01 }
+		{ "id": 1, "levels": [ 1, 2 ], "share": 0.05 },
+		{ "id": 2, "levels": [ 3, 4 ], "share": 0.10 },
+		{ "id": 3, "levels": [ 5, 6 ], "share": 0.15 },
+		{ "id": 4, "levels": [ 7, 8 ], "share": 0.20 },
+		{ "id": 5, "levels": [ 9, 10 ], "share": 0.25 }
 	],
+	"qoraHoldersShare": 0.20,
 	"qoraPerQortReward": 250,
+	"minAccountsToActivateShareBin": 30,
+	"shareBinActivationMinLevel": 7,
 	"blocksNeededByLevel": [ 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 ],
 	"blockTimingsByHeight": [
 		{ "height": 1, "target": 60000, "deviation": 30000, "power": 0.2 }

src/test/resources/test-chain-v2.json

@@ -18,23 +18,23 @@
 	"founderEffectiveMintingLevel": 10,
 	"onlineAccountSignaturesMinLifetime": 3600000,
 	"onlineAccountSignaturesMaxLifetime": 86400000,
+	"onlineAccountsModulusV2Timestamp": 9999999999999,
 	"rewardsByHeight": [
 		{ "height": 1, "reward": 100 },
 		{ "height": 11, "reward": 10 },
 		{ "height": 21, "reward": 1 }
 	],
 	"sharesByLevel": [
-		{ "levels": [ 1, 2 ], "share": 0.05 },
-		{ "levels": [ 3, 4 ], "share": 0.10 },
-		{ "levels": [ 5, 6 ], "share": 0.15 },
-		{ "levels": [ 7, 8 ], "share": 0.20 },
-		{ "levels": [ 9, 10 ], "share": 0.25 }
-	],
-	"qoraHoldersShareByHeight": [
-		{ "height": 1, "share": 0.20 },
-		{ "height": 1000000, "share": 0.01 }
+		{ "id": 1, "levels": [ 1, 2 ], "share": 0.05 },
+		{ "id": 2, "levels": [ 3, 4 ], "share": 0.10 },
+		{ "id": 3, "levels": [ 5, 6 ], "share": 0.15 },
+		{ "id": 4, "levels": [ 7, 8 ], "share": 0.20 },
+		{ "id": 5, "levels": [ 9, 10 ], "share": 0.25 }
 	],
+	"qoraHoldersShare": 0.20,
 	"qoraPerQortReward": 250,
+	"minAccountsToActivateShareBin": 30,
+	"shareBinActivationMinLevel": 7,
 	"blocksNeededByLevel": [ 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 ],
 	"blockTimingsByHeight": [
 		{ "height": 1, "target": 60000, "deviation": 30000, "power": 0.2 }

src/test/resources/test-settings-v2-no-sig-agg.json

@@ -0,0 +1,19 @@
+{
+  "repositoryPath": "testdb",
+  "bitcoinNet": "TEST3",
+  "litecoinNet": "TEST3",
+  "restrictedApi": false,
+  "blockchainConfig": "src/test/resources/test-chain-v2-no-sig-agg.json",
+  "exportPath": "qortal-backup-test",
+  "bootstrap": false,
+  "wipeUnconfirmedOnStart": false,
+  "testNtpOffset": 0,
+  "minPeers": 0,
+  "pruneBlockLimit": 100,
+  "bootstrapFilenamePrefix": "test-",
+  "dataPath": "data-test",
+  "tempDataPath": "data-test/_temp",
+  "listsPath": "lists-test",
+  "storagePolicy": "FOLLOWED_OR_VIEWED",
+  "maxStorageCapacity": 104857600
+}