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      • SignMessage
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SignTransaction

PreviousSignAllTransactionsNextSignMessage

Last updated 8 months ago

is the simplest and most recommended method for sending a transaction. Backpack submits the transaction immediately after signing so it is safer for users and a simpler API for developers, rather than relying on the application to do so.

However, it is also possible for an app to request just the signature from Backpack. Once signed, an app can submit the transaction itself using the sendRawTransaction.

Base URL

https://backpack.app/ul/v1/signTransaction

Query String Parameters

  • dapp_encryption_public_key (required): The original encryption public key used from the app side for an existing session.

  • nonce (required): A nonce used for encrypting the request, encoded in base58.

  • redirect_link (required): The URI where Backpack should redirect the user upon completion. Please review for more details. URL-encoded.

  • payload (required): An encrypted JSON string with the following fields:

    {
      "transaction": "...", // serialized transaction, base58 encoded
      "session": "...", // token received from connect-method
    }
    • transaction (required): The that Backpack will sign is serialized and encoded in base58.

    • session (required): The session token received from the method. Please see for more details.

Returns

Approve

  • nonce: A nonce used for encrypting the response, encoded in base58.

  • // content of decrypted `data`-parameter
    {
        transaction: "...", // signed serialized transaction, base58 encoded
    }

Reject

An errorCode and errorMessage as query parameters.

{
  "errorCode": "...",
  "errorMessage": "..."
}

data: An encrypted JSON string. Refer to to learn how apps can decrypt data using a shared secret. Encrypted bytes are encoded in base58.

transaction: The signed and serialized transaction that is encoded in base58. Backpack will not submit this transaction. An application can submit this transaction via the sendRawTransaction.

Please refer to for a full list of possible error codes.

SignAndSendTransaction
web3.js
Connect
Specifying Redirects
transaction
Connect
Handling Sessions
Encryption
web3.js
Errors