1.检查元交易签名私钥是否正确。
例如：
mint元交易：hexPrivateKey私钥是否和to账户对应
metaTransaction.getSafeMintDigest(to, amount, ddcURI, data, nonce, deadline);
metaTransaction.generateSignature(hexPrivateKey, digest);
SafeTransferFrom元交易：hexPrivateKey私钥是否和from账户对应
metaTransaction.getSafeTransferFromDigest(from, to, ddcId, amount, data, nonce, deadline);
metaTransaction.generateSignature(hexPrivateKey, digest);
2.检查chainid是否正确，文昌链为1223
DDC1155MetaTransaction metaTransaction = DDC1155MetaTransaction.builder()
.setChainId(BigInteger.valueOf(1223)) //文昌链chainid 1223
.setContractAddress("0x0E762F4D11439B1130D402995328b634cB9c9973")
.build();
