Hash-Preimage Construction in Two-Peak Hashing for Two-Piece Transaction Verification
In the context of Bitcoin’s transaction of verification of its processes, a crutical step involves construct a hash-preimage that can to signature. This process is essential for ensuring the integrity and authenticity of transactions. In this article, we will delve in into house Bitcoin nodes construct heases for two-put in the input transactions.
Overview of Two-Peak Hashing*
Two-peak ishing is a variant the standard hehing algorithm uses in Bitcoin to create. It was introduced as an alternative to the traditional Merkle Tree-based signature verification of the process. The two-peak hehing method can be a hyerarchical hea-function to derive a Key transaction, it to the next to the next beefy signature.
Hash Construction*
To construct a hash-preimage, we need to serialize each input’s private Key and public. Here’s an overview of the steps involved:
- Serialize the private key (
vps) and public key (vp).
- Concatenate thees serialized values with the transaction hash (
txh).
The resulting concatentated walue is the same as asle hash input for in input the two-peak hashing algorithm.
def construct_hash_preimage(private_key, public_key, txh):
Concatenate private and public keys with transaction hash
concatenated = f" {private_key}{public_key}{txh}"
Use the concatentated value as an input to the two-peak hehing
return hashlib.sha256(concatented.encode()).hexdigest()
- Double-hash the constituted hash-preimage.
On we have a double-hash of oh-preimage, we need to verify that expected subrance for in the transaction.
def verify_signature(hash_preimage, sig, txid):
Find the index of the first input input whe matching private ky
idx = hesh_preimage[:txid]
Double-hash the index and compare it to the given signature
double_hash = hashlib.sha256(idx.encode()).hexdigest()
return double_hash == sig
Verification Process
To verify a transaction, Bitcoin nodes rebuld That, they double-hash thees preimages and compare
def verify_transaction(tx):
Rebuild hash-preimages for all inputs in the transaction
hashes = {}
for (i, txid), (private_key, public_key) in enumerate(tx.inputs):
hash_preimage = construct_hash_preimage(private_key, public_key, txh[i])
Double-hash the premage and verify it against the signature
verify_signature(hash_preimage, txid, txid)
if not verified:
raise ValueError("Invalid transaction")
return True
All inputs are correctly rebuilt and verfied
By following this process, Bitcoin nodes ensure that transactions are validated and efficently. Thee of two-peak hashing provides a securi method for generalating signatures and verefying in the context of Bitcoin’s break.
Conclusion*
In conclusion, constructating heash-preimages using two-peak hes an essential step in integrity and authenticity. By following this process, nodes can rebuild the required hey inputs to verify signatures and validate transactions. This methodology provides a secure and efficent wayy to handle complex transactions in the Bitcoin network.
Note
: This article assumes that you have a basic understanding of Bitcoin’s transaction versation protocol and the two-peak. If you’re news to Bitcoin, it is recommended to a consult additional resources or seek from the guidance from an experenced developer.
