Special Transaction Types

In Xumm, you can use all XRPL transaction types when sending a JSON transaction payload. However, some special transaction types are unique to Xumm.

Pseudo Transactions:

• SignIn Xumm specific, signature only, can never be submitted. When sending a JSON transaction payload, you can use all XRPL transaction types, including a Xumm-specific "pseudo transaction type": SignIn.

  The payload for a SignIn transaction can look like this:

  {
    "txjson": {
      "TransactionType": "SignIn"
    }
  }

  After the user signs your SignIn request, the server-to-server call (to your configured Webhook location) will receive the signed transaction containing the signed transaction HEX blob.

  You can verify the signature using the verify-xrpl-signature package: https://github.com/XRPL-Labs/verify-xrpl-signature

• PaymentChannelAuthorize Is normally a 'Command' or locally signed object. Implemented in Xumm as a TransactionType (which it actually isn't, also: the resulting signed blob can never be submitted to an XRPL node as is). For more information, see: https://xrpl.org/use-payment-channels.html Sample PayChan transactions (gist): https://gist.github.com/WietseWind/c7b6addfd9b8cb465894209cc9073c47

Note: The SignIn transaction type is particularly useful when you want to authenticate a user without performing any transaction on the XRPL. The PaymentChannelAuthorize transaction type, on the other hand, is useful when you want to authorize a payment channel without submitting a transaction to the XRPL.