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[185.70.43.167]) by gmr-mx.google.com with ESMTPS id 5b1f17b1804b1-4904560c5b3si3339675e9.2.2026.05.26.17.17.20 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 26 May 2026 17:17:20 -0700 (PDT) Received-SPF: pass (google.com: domain of digi3d@protonmail.com designates 185.70.43.167 as permitted sender) client-ip=185.70.43.167; Date: Wed, 27 May 2026 00:17:15 +0000 To: bitcoindev@googlegroups.com From: "'3D' via Bitcoin Development Mailing List" Subject: [bitcoindev] [BIP Proposal] Hybrid SPHINCS+ / secp256k1 Key Derivation for Quantum-Resistant Paper Wallets Message-ID: Feedback-ID: 32672976:user:proton X-Pm-Message-ID: e2b7b3e71491b70efc0294e86f9c068e27105dfa MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="b1=_QDLuUMtNz3y9HyDiYwcqIFFYyxQbpYtsxAbweL5qE" X-Original-Sender: digi3d@protonmail.com X-Original-Authentication-Results: gmr-mx.google.com; dkim=pass header.i=@protonmail.com header.s=protonmail3 header.b=Iym4VZYZ; spf=pass (google.com: domain of digi3d@protonmail.com designates 185.70.43.167 as permitted sender) smtp.mailfrom=digi3d@protonmail.com; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=protonmail.com X-Original-From: 3D Reply-To: 3D Precedence: list Mailing-list: list bitcoindev@googlegroups.com; contact bitcoindev+owners@googlegroups.com List-ID: X-Google-Group-Id: 786775582512 List-Post: , List-Help: , List-Archive: , List-Unsubscribe: , X-Spam-Score: -1.0 (-) --b1=_QDLuUMtNz3y9HyDiYwcqIFFYyxQbpYtsxAbweL5qE Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi all, I'd like to propose a new wallet-layer BIP for a practical hybrid post-quan= tum key derivation scheme. **Title:** Hybrid SPHINCS+ / secp256k1 Key Derivation for Quantum-Resistant= Bitcoin Wallets **Summary:** This BIP defines a simple, immediately usable method that combines NIST-sta= ndardized SLH-DSA (SPHINCS+) with the 3=E2=80=99s Company HE-SD (High-Entro= py Seed Distillation) algorithm (which uses SPX-QEC for cleanup) to derive = ordinary secp256k1 private keys and standard Bitcoin addresses (legacy + BI= P-341 Taproot). The process is fully offline, runs on low-end/air-gapped hardware (Raspberr= y Pi class), and produces keys that work today with Electrum, bitaddress.or= g, and Bitcoin Core; no consensus changes required. **Reference implementation & full code:** https://github.com/DigiMancer3D/bip-xxx-sphincs-hybrid **Draft BIP text:** https://github.com/DigiMancer3D/bip-xxx-sphincs-hybrid/blob/main/bip-xxx.me= diawiki This is intended as a practical bridge for quantum-hardened cold storage/pa= per wallets while post-quantum consensus migration is still in the future. Happy to answer questions, incorporate feedback, and make any changes neede= d. Thanks, DigiMancer3D --=20 You received this message because you are subscribed to the Google Groups "= Bitcoin Development Mailing List" group. To unsubscribe from this group and stop receiving emails from it, send an e= mail to bitcoindev+unsubscribe@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/bitcoindev/= bpSypbIuSoDinhE-Y4CrVI5LGHrJ_I79xYUzpYswA5JGkbASwibq94UozeR2jsu48vH6FZLdEBP= pWHgIuVtSpUNy-tRpnGfe1hce2ti8k5w%3D%40protonmail.com. --b1=_QDLuUMtNz3y9HyDiYwcqIFFYyxQbpYtsxAbweL5qE Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi all,

I'd like to propose a n= ew wallet-layer BIP for a practical hybrid post-quantum key derivation sche= me.

**Title:** Hybrid SPHINCS+ / secp256k1 Key Der= ivation for Quantum-Resistant Bitcoin Wallets

**Su= mmary:**
This BIP defines a simple, immediately usable method tha= t combines NIST-standardized SLH-DSA (SPHINCS+) with the 3=E2=80=99s Compan= y HE-SD (High-Entropy Seed Distillation) algorithm (which uses SPX-QEC for = cleanup) to derive ordinary secp256k1 private keys and standard Bitcoin add= resses (legacy + BIP-341 Taproot).

The process is = fully offline, runs on low-end/air-gapped hardware (Raspberry Pi class), an= d produces keys that work today with Electrum, bitaddress.org, and Bitcoin = Core; no consensus changes required.

**Refere= nce implementation & full code:**
https://github.com/DigiManc= er3D/bip-xxx-sphincs-hybrid

**Draft BIP text:**
https://github.com/DigiMancer3D/bip-xxx-sphincs-hybrid/blob/main/bi= p-xxx.mediawiki

This is intended as a practical br= idge for quantum-hardened cold storage/paper wallets while post-quantum con= sensus migration is still in the future.

Happ= y to answer questions, incorporate feedback, and make any changes needed.

Thanks,
DigiMancer3D

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