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@ Zatoichi
2025-06-09 08:52:48
Bitcoin Quantum Resistance Proposals Thread 🧵
https://blossom.primal.net/47f5d849bcd43d735959d4c97720d5a1b92e1b2b5edf1b47806c3ac0012c8943.png
1. BIP-360 "QuBit" (Pay-to-QR-Hash Addr)
~: New SegWit output type (P2QRH) supporting PQ signatures like FALCON/SPHINCS+.
+: Provides strong QR; clear migration path, incentivized by SegWit discounts (~16x discount).
-:PQ signatures increase TX (FALCON ~1KB; SPHINCS+ ~10-30KB/tx)
> BIP-360 Implementation: Soft fork via new SegWit v3 addresses and script opcodes; backward-compatible, staged upgrade path.
Status: Draft BIP-360 submitted (2024); actively discussed, widely anticipated as primary candidate.
Feasibility Score: 70/100
2. BIP-XXXX "Cruz’s QR Crypto" (Dilithium/SPHINCS+)
~: Integrates 2 NIST-approved PQ schemes: CRYSTALS-Dilithium (lattice-based) and SPHINCS+ .
> BIP-XXXX "Cruz’s QR Crypto" Implementation: Proposed as a soft fork with new SegWit version; backward compatible but requires wallet/node upgrades.
Status: Draft BIP proposed Oct 2024; active review underway; authors encouraged collaboration with BIP-360.
Feasibility:60/100
+: Strong crypto backing, clear path using new Bech32 addresses (bq1...) and PQ script opcodes.
-: Large signatures-~2KB, -~16–40KB/tx
3. Taproot Key Hash (P2TRH) (Hashed Taproot Keys)
~: Modify Taproot addresses to use hashed public keys (similar to legacy P2PKH), hiding keys until spend.
+: Simple interim fix; minimal cryptographic change, protects unused addresses from quantum threats.
-: Temp fix
> Taproot Key Hash Implementation: Soft fork introducing alternative hashed-key Taproot address; minimal consensus changes.
Status: Conceptual stage, post-Taproot activation discussions; not yet official BIP.
Feasibility Score: 50/100
4. Quantum Resistant Ledger (QRL) (XMSS Hash-Based Signatures)
~: Uses XMSS (Extended Merkle Signature Scheme) hash-based, stateful 1-time sigs; used in alts
+: Proven quantum-safe technology; operational blockchain demonstrates practical viability.
-: complex;larger sigs(few KB)
> Quantum Resistant Ledger (QRL) Implementation: Requires significant consensus changes (hard fork or extensive soft fork), complicated wallet management.
Status: Implemented in QRL alt; provides practical case study but not officially proposed as Bitcoin BIP.
Score: 50/100
5. ZK-STARK Aggregation (Off-chain PQ Signature Compression)
~: Aggregate PQ signatures off-chain using Zero-Knowledge STARK proofs; single proof recorded on-chain.
+: Efficient, significantly reduces on-chain size& enhances scalability/privacy.
-: Complex, experimental.
>ZK-STARK Aggregation Implementation: Soft fork adding new opcodes for ZK-STARK proof verification; requires considerable infrastructure change.
Status: Primarily theoretical proposal; active Ethereum discussions, no serious Bitcoin proposal yet.
Feasibility Score: 30/100
6. Great Script Restoration (OP_CAT enabling PQ scripts)
~: Re-enable Bitcoin Script opcodes (OP_CAT) manually construct PQ sig verifications in scripts.
+: Flexible, emergency solution w/out committing to specific PQ schemes at consensus level.
-: inefficient, not secure.
>Great Script Restoration Implementation:
Soft fork reactivating opcodes; no immediate address-format changes but significant script complexity.
Status: Discussed in context of opcode restorations; viewed as a fallback rather than a primary solution.
Feasibility Score: 25/100
7. Bitcoin Post-Quantum (BPQ) (WOTS+ 1-Time Signatures Hard Fork)
~: HF variant (2018) using Winternitz 1 -Time Signature (WOTS+) QS scheme exclusively.
+: Complete quantum-proof blockchain demonstrated practically (prototype hard-fork).
-: Hard fork; impractical; not scalable
>BTQ Hard Fork Implementation: Full blockchain break from Bitcoin consensus; mandatory software replacement; discontinued experiment.
Status: Experimental alt, inactive since 2018; provided valuable research insights but not a viable Bitcoin upgrade.
Feasibility: 20/100
Summary:
Most Promising: BIP-360 and Cruz’s QR Crypto. Practical soft-fork implementations using established PQ schemes.
Moderate: P2TRH (Taproot hash) and QRL (XMSS). Viable with notable complexities or temp effectiveness.
FAIL: ZK-STARK, SR & BPQ (WOTS+)
More on the most feasible post quantum Bitcoin BIP:
https://bip360.org
Author:
@cryptoquick
https://cryptoquick.com