Verify signed transaction for a given address

[Cannikin]

I’m using the Javascript SDK. How can I verify that a signed transaction was signed by a given address? I guess this is a UInt8Array. Running it through TextDecoder leaves me with some text but a bunch of ‘unknown’ bytes as well:

// result of `signTransaction()` from MyAlgoConnect lib:
{"0":130,"1":163,"2":115,"3":105,"4":103,"5":196,"6":64, ...}

// now trying to decode
new TextDecoder('utf-8').decode(bytes)
// returns: ��sig�@ՂK��d�aK�ۯ_s�?�4~I...

I found verifyBytes in the SDK, but I don’t know how to extract the signature from the resulting UInt8Array, or what the bytes should be that I’m verifying (I’m assuming the initial raw transaction object that I sent to the wallet for signing?).

Any help would be greatly appreciated!

[fabrice]

Here is some code for Go:

Verify Signature on Signed Transaction

// txidPrefix is prepended to a transaction when computing its txid var txidPrefix = []byte("TX") // RawTransactionBytesToSign returns the byte form of the tx that we actually sign // and compute txID from. func RawTransactionBytesToSign(tx types.Transaction) []byte { // Encode the transaction as msgpack encodedTx := msgpack.Encode(tx) // Prepend the hashable prefix msgParts := [][]byte{txidPrefix, encodedTx} return bytes.Join(msgParts, nil) } // VerifySignature verifies a simple signatu…

This can be adapted to all the SDK.

You should not try to convert the Uint8Array into text as this is not meant to be text. It is a msgpack encoded message.