Get exact sign hash.

[rachkumar]

Hi I need to get exact hex for a string...what I have tried
   let mnemonic = "xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx"
    let seed = Mnemonic.createSeed(mnemonic: mnemonic)
    let purpose1 = PrivateKey.init(seed: seed, coin: .bitcoin)
    let purpose = purpose1.derived(at: .hardened(44))
    //Bitcoin
    let coinType = purpose.derived(at: .hardened(0))
    // m/44'/0'/0'
    let account = coinType.derived(at: .hardened(0))
    // m/44'/0'/0'/0
    let change = account.derived(at: .notHardened(0))
    // m/44'/0'/0'/0/0
    let firstPrivateKey = change.derived(at: .notHardened(0))
    
    let sign = "1dca0a148623f3f5ce5f49b2abc34384403e545620dca69ceb59da246951b4c3"
    let data = Data.init(hex: sign)
     let signatureData = try! firstPrivateKey.sign(hash: data)
    print(signatureData.hex)

    It gives me wrong hex and Error reading signaturesalid signature, wrong length.