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BuildSDKsGo SDKTransactionsMulti-Agent Transactions

Multi-Agent Transactions

Multi-agent transactions allow multiple accounts to participate in the logic of a Move contract.

This can be used to require multiple parties agree to a transaction before executing or to use resources from multiple accounts.

Writing Multi-Agent Transactions

Creating and executing a multi-agent transaction follows a similar flow to the regular transaction flow, but with several notable differences.

Instead of client.BuildTransaction, multi-agent and sponsored transactions use client.BuildTransactionMultiAgent.

Build the transaction by including aptos.AdditionalSigners with a list of each additional signers.

Make sure to replace the Function field below with your entry function that requires multiple agents to sign.

multi_agent.go
transaction, err := client.BuildTransactionMultiAgent(alice.AccountAddress(), aptos.TransactionPayload{
  Payload: &aptos.EntryFunction{
    // Replace module and function with your multi-agent function
    Module: aptos.ModuleId{
      Address: aptos.AccountOne,
      Name:    "aptos_account",
    },
    Function: "transfer",
    ArgTypes: []aptos.TypeTag{},
    Args: [][]byte{
      accountBytes,
      amountBytes,
    },
  },
  AdditionalSigners: []aptos.AccountAddress{bob.AccountAddress()},
})

Sign once for each signer.

You will combine these signatures in the next step.

multi_agent.go
aliceAuth, err := rawTxn.Sign(alice)
if err != nil {
    panic("Failed to sign transaction as sender:" + err.Error())
}
bobAuth, err := rawTxn.Sign(bob)
if err != nil {
    panic("Failed to sign transaction as second signer:" + err.Error())
}

Combine the signatures with the raw transaction to create a multi-agent signed transaction.

multi_agent.go
signedTxn, ok := rawTxn.ToMultiAgentSignedTransaction(aliceAuth, []crypto.AccountAuthenticator{bobAuth})

Submit the transaction by combining all agent signatures via the aptos.AdditionalSigners parameter.

multi_agent.go
submitResponse, err := client.SubmitTransaction(signedTxn)

Lastly, wait for the transaction to resolve.

multi_agent.go
txnResult, err := client.WaitForTransaction(submitResponse.Hash)

Common Errors

NUMBER_OF_SIGNER_ARGUMENTS_MISMATCH - This happens when you are attempting to do multi-agent signing for a function which does not require that number of accounts. For example, if you try using multiple signatures for a 0x1::aptos_account::transfer function - it only expects one address, and so produces an error when more than one is provided.

Simulating TransactionsSponsoring Transactions