New answers tagged transaction-verification
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The bitcoin p2p protocol does not directly permit transaction lookups this way. Maybe some bloom filtering would minimize the footprint, but it's still relatively complex to implement.
Electrum servers are maybe the next best thing - they do support the lookups you want, but they're less decentralized, and if your application is doing naughty things they ...
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Usually the issue is the Signature Verification algorithm used. Bitcoin uses double SHA-256 as the hashing algorithm for ECDSA, thus the Z value is the Double SHA-256 hash of the unsigned transaction. Looking at the Signature Hash Algorithm you're using:
Signature algorithm ALG_ECDSA_SHA_256 generates a 32-byte SHA-256 digest and signs/verifies the digest ...
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