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send-transaction.md

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Send Transaction

{% hint style="warning" %} Make sure you initialize Blocto SDK first {% endhint %}

Once your app is connected to Blocto wallet, it can send transactions on behalf of the user, with the user's permission.

In order to send a transaction, the app needs to:

  • Create data which is the content of transacting with a smart contract
  • Create value if needs to send the Ether to smart contract
Parameter Type Description
fromAddress address string the sender address
toAddress address string the smart contract address
data hex string (0x prefix) the content of transacting with a smart contract, can use library, such as Web3j, to generate
value (optional) BigInteger the amount of Ether deposit in the smart contract (if the smart contract accepts ether) 
// Create data using web3j
val donateFunction = Function(
    "donate", 
    listOf(Utf8String("Hi, Blocto")), 
    emptyList()
)
val data = FunctionEncoder.encode(donateFunction)

// Create value using web3j
val value = Convert.toWei("1", Convert.Unit.ETHER).toBigInteger()

// Send transaction based on specific chain
BloctoSDK.evm.sendTransaction(
    context = context,
    blockchain = Blockchain.ETHEREUM,
    fromAddress = fromAddress,
    toAddress = toAddress,
    data = data,
    value = value,
    onSuccess = { txHash ->
        // transaction sent
    },
    onError = { error ->
        // handle error
    }
)