Error creating Staking Delegation transaction with Yoroi Wallet using CIP30

[NicolasEliasArias]

Hi! I’m trying to create a stake delegation transaction using cardano-serialization-lib, js, and Yoroi with the CIP30 API (Cardano dApp-Wallet Web Bridge https://cips.cardano.org/cips/cip30/)

I’m using Yoroi Nightly and Testnet

Delegation function code:

const bech32Addr = this.state.changeAddress //obtaining my payment address
const address = Address.from_bech32(bech32Addr)
const baseAddress = BaseAddress.from_address(address);
const txUnspentOutputs = await this.getTxUnspentOutputs();


const txBuilder = await this.initTransactionBuilder(); // creating transaction
txBuilder.add_inputs_from(txUnspentOutputs, 0)

const certs = Certificates.new();

const poolId = this.state.poolId
const poolKeyHash = Ed25519KeyHash.from_bytes(Buffer.from(poolId, 'hex'));

//Adding StakeDelegation Certificate
certs.add(
    Certificate.new_stake_delegation(
        StakeDelegation.new(
            baseAddress.stake_cred(),
            poolKeyHash
        )
    )
);

txBuilder.set_certs(certs)  

txBuilder.add_change_if_needed(address)

const txBody = txBuilder.build();

const transactionWitnessSet = TransactionWitnessSet.new();
const tx = Transaction.new(
    txBody,
    TransactionWitnessSet.from_bytes(transactionWitnessSet.to_bytes())
)

// "this.API" is the Yoroi API created using "window.cardano.yoroi.enable()"
let txVkeyWitnesses = await this.API.signTx(Buffer.from(tx.to_bytes(), "utf8").toString("hex"), true);
txVkeyWitnesses = TransactionWitnessSet.from_bytes(Buffer.from(txVkeyWitnesses, "hex"));

transactionWitnessSet.set_vkeys(txVkeyWitnesses.vkeys());
const signedTx = Transaction.new(
    tx.body(),
    transactionWitnessSet
);
const submittedTxHash = await this.API.submitTx(Buffer.from(signedTx.to_bytes(), "utf8").toString("hex"));

initTransactionBuilder code:

/**
 * Every transaction starts with initializing the
 * TransactionBuilder and setting the protocol parameters
 * This is boilerplate
 * @returns {Promise<TransactionBuilder>}
 */
initTransactionBuilder = async () => {

    const txBuilder = TransactionBuilder.new(
        TransactionBuilderConfigBuilder.new()
            .fee_algo(LinearFee.new(BigNum.from_str(this.protocolParams.linearFee.minFeeA), BigNum.from_str(this.protocolParams.linearFee.minFeeB)))
            .pool_deposit(BigNum.from_str(this.protocolParams.poolDeposit))
            .key_deposit(BigNum.from_str(this.protocolParams.keyDeposit))
            .coins_per_utxo_word(BigNum.from_str(this.protocolParams.coinsPerUtxoWord))
            .max_value_size(this.protocolParams.maxValSize)
            .max_tx_size(this.protocolParams.maxTxSize)
            .prefer_pure_change(true)
            .build()
    );

    return txBuilder
}

This exact code is working correctly with the following Wallets (also using CIP30):

• Nami
• Flint
• CCVault / Eternl
• Typhon
• Nufi

The only Wallet that doesn’t work is Yoroi.

This is the error I’m getting:

transaction submit error ShelleyTxValidationError ShelleyBasedEraBabbage (ApplyTxError [UtxowFailure (FromAlonzoUtxowFail (WrappedShelleyEraFailure (MissingVKeyWitnessesUTXOW (WitHashes (fromList [KeyHash "bdd5302aa402af3018f558b9eef255751633abc32c7352d9eb1d2f37"])))))])

Maybe I’m wrong but I think Yoroi is not signing the StakeDelegation certificate.

I also tried adding the StakeRegistration Certificate and the result is the same.

I’m able to create regular transactions with Yoroi (only sending ADA), I just can’t do transactions related to Staking.

If you are wondering why I want to do this and not use the Yoroi UI is because I want to add metadata to the transaction and also so the users can delegate directly from my website.