GET /admin/status now returns online account submission status for "isMintingPossible", instead of BlockMinter status.

Online account credit is a more useful definition of "minting" than block signing, from the user's perspective. Should bring UI minting/syncing status in line with the core's systray status.

src/main/java/org/qortal/api/model/NodeStatus.java

@@ -4,6 +4,7 @@ import javax.xml.bind.annotation.XmlAccessType;
 import javax.xml.bind.annotation.XmlAccessorType;
 
 import org.qortal.controller.Controller;
+import org.qortal.controller.OnlineAccountsManager;
 import org.qortal.controller.Synchronizer;
 import org.qortal.network.Network;
 
@@ -21,7 +22,7 @@ public class NodeStatus {
 	public final int height;
 
 	public NodeStatus() {
-		this.isMintingPossible = Controller.getInstance().isMintingPossible();
+		this.isMintingPossible = OnlineAccountsManager.getInstance().hasActiveOnlineAccountSignatures();
 
 		this.syncPercent = Synchronizer.getInstance().getSyncPercent();
 		this.isSynchronizing = Synchronizer.getInstance().isSynchronizing();

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

@@ -462,6 +462,18 @@ public class OnlineAccountsManager {
         return this.currentOnlineAccounts.containsKey(onlineAccountsTimestamp);
     }
 
+    /**
+     * Whether we have submitted - or attempted to submit - our online account
+     * signature(s) to the network.
+     * @return true if our signature(s) have been submitted recently.
+     */
+    public boolean hasActiveOnlineAccountSignatures() {
+        final Long minLatestBlockTimestamp = NTP.getTime() - (2 * 60 * 60 * 1000L);
+        boolean isUpToDate = Controller.getInstance().isUpToDate(minLatestBlockTimestamp);
+
+        return isUpToDate && hasOnlineAccounts();
+    }
+
     public boolean hasOurOnlineAccounts() {
         return this.hasOurOnlineAccounts;
     }