Minor fix-up to allow go-live:

Re-add (for now) Ed25519 HSQLDB conversion.
Catch DataException in BlockChain.isGenesisBlockValid and return false.
Remove duplicate bug-fix for LeaveGroupTransactions DB table.

Interim, near-final blockchain.json

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

@@ -510,7 +510,7 @@ public static void validate() throws DataException {
 		}
 	}
 
-	private static boolean isGenesisBlockValid() throws DataException {
+	private static boolean isGenesisBlockValid() {
 		try (final Repository repository = RepositoryManager.getRepository()) {
 			BlockRepository blockRepository = repository.getBlockRepository();
 
@@ -523,6 +523,8 @@ private static boolean isGenesisBlockValid() throws DataException {
 				return false;
 
 			return GenesisBlock.isGenesisBlock(blockData);
+		} catch (DataException e) {
+			return false;
 		}
 	}
 

src/main/java/org/qortal/repository/hsqldb/HSQLDBDatabaseUpdates.java

@@ -618,11 +618,6 @@ private static boolean databaseUpdating(Connection connection) throws SQLExcepti
 					stmt.execute("CREATE TABLE PublicizeTransactions (signature Signature, nonce INT NOT NULL, " + TRANSACTION_KEYS + ")");
 					break;
 
-				case 20:
-					// XXX Bug-fix, but remove when we build new genesis
-					stmt.execute("ALTER TABLE LeaveGroupTransactions ADD COLUMN IF NOT EXISTS previous_group_id GroupID");
-					break;
-
 				default:
 					// nothing to do
 					return false;

src/main/java/org/qortal/repository/hsqldb/HSQLDBRepository.java

@@ -24,6 +24,8 @@
 
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
+import org.qortal.account.PrivateKeyAccount;
+import org.qortal.crypto.Crypto;
 import org.qortal.repository.ATRepository;
 import org.qortal.repository.AccountRepository;
 import org.qortal.repository.ArbitraryRepository;
@@ -744,4 +746,18 @@ private void assertEmptyTransaction(String context) throws DataException {
 		}
 	}
 
+	public static byte[] ed25519PrivateToPublicKey(byte[] privateKey) {
+		if (privateKey == null)
+			return null;
+
+		return PrivateKeyAccount.toPublicKey(privateKey);
+	}
+
+	public static String ed25519PublicKeyToAddress(byte[] publicKey) {
+		if (publicKey == null)
+			return null;
+
+		return Crypto.toAddress(publicKey);
+	}
+
 }