Implemented REGISTER_NAME transaction fee increase from 0.001 to 5 QORT (average value based on community vote).

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

@@ -72,6 +72,11 @@ public class BlockChain {
 		transactionV5Timestamp;
 	}
 
+	// Custom transaction fees
+	@XmlJavaTypeAdapter(value = org.qortal.api.AmountTypeAdapter.class)
+	private long nameRegistrationUnitFee;
+	private long nameRegistrationUnitFeeTimestamp;
+
 	/** Map of which blockchain features are enabled when (height/timestamp) */
 	@XmlJavaTypeAdapter(StringLongMapXmlAdapter.class)
 	private Map<String, Long> featureTriggers;
@@ -301,6 +306,16 @@ public class BlockChain {
 		return this.maxBlockSize;
 	}
 
+	// Custom transaction fees
+	public long getNameRegistrationUnitFee() {
+		return this.nameRegistrationUnitFee;
+	}
+
+	public long getNameRegistrationUnitFeeTimestamp() {
+		// FUTURE: we could use a separate structure to indicate fee adjustments for different transaction types
+		return this.nameRegistrationUnitFeeTimestamp;
+	}
+
 	/** Returns true if approval-needing transaction types require a txGroupId other than NO_GROUP. */
 	public boolean getRequireGroupForApproval() {
 		return this.requireGroupForApproval;

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

@@ -37,6 +37,15 @@ public class RegisterNameTransaction extends Transaction {
 		return Collections.emptyList();
 	}
 
+	@Override
+	public long getUnitFee(Long timestamp) {
+		// Use a higher unit fee after the fee increase timestamp
+		if (timestamp > BlockChain.getInstance().getNameRegistrationUnitFeeTimestamp()) {
+			return BlockChain.getInstance().getNameRegistrationUnitFee();
+		}
+		return BlockChain.getInstance().getUnitFee();
+	}
+
 	// Navigation
 
 	public Account getRegistrant() {

src/main/resources/blockchain.json

@@ -4,6 +4,8 @@
 	"maxBlockSize": 2097152,
 	"maxBytesPerUnitFee": 1024,
 	"unitFee": "0.001",
+	"nameRegistrationUnitFee": "5",
+	"nameRegistrationUnitFeeTimestamp": 9999999999999,
 	"useBrokenMD160ForAddresses": false,
 	"requireGroupForApproval": false,
 	"defaultGroupId": 0,