crypto: Add pq1 post-quantum hybrid address (Schnorr + Falcon-1024) #35566

Adds pq1... Bech32m address type for post-quantum hybrid signatures.

Technical Details

• Witness version: 2, 1825B program (32B Schnorr + 1793B Falcon-1024)
• Falcon-1024: Real liboqs integration — keygen, sign, verify
• SHRINCS: Hash-based signatures (580B compact mode)
• Hybrid verify: BIP 340 Schnorr via secp256k1 + Falcon-1024 via liboqs
• Encoding: Bech32m with pq1 HRP

Security

Tests (5 cases)

• Falcon-1024 keygen/sign/verify with wrong key/message rejection
• SHRINCS hash chain verification
• PQ signature auto-routing
• pq1 address encoding format
• Hybrid composite signature structure

Dependencies

• liboqs 0.15.0+ for Falcon-1024
• secp256k1 Schnorr module (already default)

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Code Coverage & Benchmarks

For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/35566.

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Reviews

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LLM Linter (✨ experimental)

Possible typos and grammar issues:

• SHRINCS -> SPHINCS [likely misspelled in comments/docs; the intended hash-based signature scheme appears to be SPHINCS+]

^{2026-06-19 08:00:31}