@rhino.fi/client-js/src/lib/dvf/createSignedTransfer.js

const createSignedTransaction = require('./createSignedTransaction')
const DVFError = require('./DVFError')

module.exports = async (dvf, transferTransaction) => {
  // dvfStarkProvider abstracts specifics of how a public key is obtained.
  const { dvfStarkProvider } = dvf
  const starkPublicKey = await dvfStarkProvider.getPublicKey()

  const senderPublicKey = `0x${starkPublicKey.x}`

  const existingSenderPublicKey = transferTransaction.senderPublicKey
  if (
    existingSenderPublicKey
    && senderPublicKey !== existingSenderPublicKey
  ) {
    throw new DVFError(
      'Unexpected senderPublicKey',
      { expected: senderPublicKey, actual: existingSenderPublicKey },
    )
  }

  return createSignedTransaction(dvf)({
    ...transferTransaction,
    senderPublicKey,
  })
}