Here’s a step-by-step guide on redeeming a raw transaction using Python ECDSA (or OpenSSL) for Ethereum:

Step 15-17: Concatenating Raw Transaction Structure and Hashing

These steps involve taking the concatenated raw transaction structure (txid, vsize, vin, vout) and hashing it with SHA-256. After that, we’ll sign the resulting hash using ECDSA.

Step 15: Concatenate Raw Transaction Structure

import hashlib

from ethereum import ec











Get the raw transaction data from a file or database

txid = '0x...your txid here...'  
Replace with your actual txid

vsize = 1000  
Replace with your actual vsize

vin = [(txid, 0)] * vsize  
Replace with your actual vin



Concatenate the raw transaction structure

raw_tx = ec.from_raw_data(vin, vsize)

Step 16: Hash the Concatenated Raw Transaction Structure

Create a new SHA-256 hash object

hash_object = hashlib.sha256()



Update the hash with the concatenated raw transaction structure

hash_object.update(raw_tx.to_bytes())



Get the hexadecimal representation of the hash

tx_hash = hash_object.hexdigest()

Step 17: Sign the Hash with ECDSA

from ethereum import ec



Create a new ECDSA key pair

key = ec.ECKey.from_raw_data('your raw key here...')



Sign the hash with the ECDSA public key

signed_tx_hash = key.sign(tx_hash, e=ec.SECP256R1, digestmod=hashlib.sha256)


print(signed_tx_hash)

Replace 'your txid here...', 1000, and 'your raw key here...' with your actual values.

Full Code

import hashlib

from ethereum import ec


def redeem_raw_tx(txid, vsize, vin):

    
Create a new SHA-256 hash object

    hash_object = hashlib.sha256()


    
Update the hash with the concatenated raw transaction structure

    hash_object.update((txid, vsize) + list(vin))


    
Get the hexadecimal representation of the hash

    tx_hash = hash_object.hexdigest()


    
Create a new ECDSA key pair

    key = ec.ECKey.from_raw_data('your raw key here...')


    
Sign the hash with the ECDSA public key

    signed_tx_hash = key.sign(tx_hash, e=ec.SECP256R1, digestmod=hashlib.sha256)


    return (txid, vsize, vin, tx_hash, signed_tx_hash)



Example usage:

txid = '0x...your txid here...'

vsize = 1000

vin = [(txid, 0)] * vsize


raw_tx = ec.from_raw_data(vin, vsize)

signed_tx_hash = redeem_raw_tx(txid, vsize, vin)

print(signed_tx_hash)

Remember to replace the placeholder values with your actual data. This is just a basic example of how to redeem a raw transaction using Python ECDSA (or OpenSSL). You may need to modify it according to your specific requirements and use case.

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