Build delegated tx by thor-devkit.js

delegated-tx.js

const originPriv = Buffer.from('c962bfd916c0f8d4c1866b11a24802815cf58ba981354fad0ac734d0217cfe73', 'hex')
const txOrigin = cry.publicKeyToAddress(cry.secp256k1.derivePublicKey(originPriv))

const delegatorPriv = Buffer.from('dce1443bd2ef0c2631adc1c67e5c93f13dc23a41c18b536effbbdcbcdb96fb65', 'hex')
const delegator = cry.publicKeyToAddress(cry.secp256k1.derivePublicKey(delegatorPriv))

const tx = new Transaction({
    chainTag: 0x27,
    blockRef: '0x002b99c540c4e267',
    expiration: 30 * 8640, // Expires after 30 days
    clauses: [{
        to: '0xd3ae78222beadb038203be21ed5ce7c9b1bff602',
        value: 0,
        data: '0x'
    }],
    gasPriceCoef: 0,
    gas: 50000,
    dependsOn: null,
    nonce: '0xa2b5232b', // Random number
    reserved: {
        features: 1
    }
})

// The hash for tx origin to sign
const originHash = tx.signingHash()
// The hash for delegator to sign
const delegatorHash = tx.signingHash('0x' + txOrigin.toString('hex'))

const sig = Buffer.concat([
    cry.secp256k1.sign(originHash, originPriv),
    cry.secp256k1.sign(delegatorHash, delegatorPriv)
])

tx.signature = sig

const rawTx = '0x' + tx.encode().toString('hex')

Working Prefect @testnet ^^'