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Author: Admin | 2025-04-28
On the operation, with each transaction costing a minimum of 21,000 gas.It is also possible to define the absolute maximum amount of gas that a transaction sender is willing to consume in order to execute the transaction, by specifying the gasLimit attribute.DeployingThe ability to deploy immutable smart contracts that live indefinitely is the secret sauce of Ethereum! Smart contracts are pieces of code with functions that can be executed by any interested parties. They live as bytecode within the network but are usually written in a language such as Solidity or Vyper, then encoded and deployed.By far the easiest way to deploy the DocumentRegistry smart contract is to use a wrapper that has been generated by Web3j. This wrapper provides a native java class representation of the smart contract. Two (non deprecated) deploy methods that can be used to deploy the code to the Ethereum network are provided:public static RemoteCall deploy(Web3j web3j, Credentials credentials, ContractGasProvider contractGasProvider)public static RemoteCall deploy(Web3j web3j, TransactionManager transactionManager, ContractGasProvider contractGasProvider)The latter allows the TransactionManager to be specified; an object which controls how Web3j connects to an Ethereum client. We're happy to use the default RawTransactionManager in this example, so we'll use the former method, which takes wallet Credentials as an argument. We must also create a ContractGasProvider, which provides the gas price and gas limit for the transaction; indirectly specifying how much the contract will cost to deploy, in Ether.DocumentRegistry Deployment Code//Create credentials from private keyCredentials creds = Credentials.create("0x8f2a55949038a9610f50fb23b5883af3b4ecb3c3bb792cbcefbd1542c692be63");DocumentRegistry registryContract = DocumentRegistry.deploy(web3j, creds, new DefaultGasProvider()).send();String contractAddress
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