Transaction Nonce
The transaction nonce¶
The nonce is an increasing numeric value which is used to uniquely identify transactions. A nonce can only be used once and until a transaction is mined, it is possible to send multiple versions of a transaction with the same nonce, however, once mined, any subsequent submissions will be rejected.
You can obtain the next available nonce via the eth_getTransactionCount method:
EthGetTransactionCount ethGetTransactionCount = web3j.ethGetTransactionCount(
address, DefaultBlockParameterName.LATEST).sendAsync().get();
BigInteger nonce = ethGetTransactionCount.getTransactionCount();
The nonce can then be used to create your transaction object:
RawTransaction rawTransaction = RawTransaction.createEtherTransaction(
nonce, <gas price>, <gas limit>, <toAddress>, <value>);