Free Quantum-Resistant Timestamping API (Dual-Signature and Bitcoin)
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SasaSavic.ca recently launched a public cryptographic timestamping service designed to remain verifiable even in a post-quantum world.The platform uses SasaSavic Quantum Shield™, a dual-signature protocol combining classical and post-quantum security.Each submitted SHA-256 hash is: • Dual-signed with ECDSA P-256 and ML-DSA-65 (per NIST FIPS 204) • Anchored to the Bitcoin blockchain via OpenTimestamps • Recorded in a public, verifiable daily ledgerAPI (beta, no auth required): https://sasasavic.ca/beta-api/Example curl request: curl -X POST https://sasasavic.ca/api/v1/beta/timestamp -H "Content-Type: application/json" -d '{"hash":"e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"}'Verification and ledgers: https://sasasavic.ca/verifyhttps://sasasavic.ca/ledgers/The goal is to make cryptographic proofs quantum-resistant and accessible, while preserving user privacy — only the hash ever leaves the client side.Feedback from developers, auditors, and researchers on PQC integration and verification speed is welcome.More details and documentation: https://sasasavic.ca/quantum-shield/– The SasaSavic.ca Team
HN · launched Nov 5, 2025 · 5 upvotes (top 90%) · 0 views
Niche: encryption and cryptography tools · 147 launches, 21 in the last 7 days ▲ +40% · Explore this niche →
Category and tags
- Horizontal
- Compliance & governance
- Developer
- Not AI
- Commercial product
More like this: all 147 launches in encryption and cryptography tools →
Could you build this?
No Implementing a verifiable quantum-resistant timestamping service involves advanced cryptography (post-quantum signature schemes like Dilithium/Falcon or SPHINCS+) alongside Bitcoin blockchain anchoring protocols.
What it would actually take: The service needs low-level cryptographic libraries supporting NIST post-quantum cryptographic standards (ML-DSA / SLH-DSA), dual-signing mechanics, Merkle tree batching, and an automated Bitcoin transaction committer (OP_RETURN anchoring via Bitcoin node RPC). Building a tamper-proof, legally defensible, and cryptographically sound service requires specialized applied cryptography researchers and blockchain infrastructure engineers.
Discussion
1 comment analyzed.
Competitors mentioned: OpenTimestamps, Traditional timestamping services (ECDSA/RSA-based)
Concerns raised: Whether quantum computing will actually break classical cryptography in relevant timeframes, Long-term viability of Bitcoin anchoring for proofs
Feature requests: SDKs for popular languages/frameworks, Batch timestamping for multiple files, Integration with document workflows
Competitors
Other products that read as similar to this one : 121 launches clear the similarity bar, closest 8 shown.
Attention rank: #119 of 122 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 6 days after the earliest competitor.
- ZKStamp Proof-100 · ph · 2026-11-07 · 1 upvotes · similarity 0.45
- scuttle · github · 2026-09-23 · 55 upvotes · similarity 0.45
- Quantum Blue · ph · 2026-09-09 · 1 upvotes · similarity 0.44
- Marma-Crypto Protocol · ph · 2026-10-18 · 1 upvotes · similarity 0.42
- Post-Quantum Pretty Good Privacy PQ-PGP · ph · 2026-10-31 · 1 upvotes · similarity 0.42
- Qopanza · ph · 2026-10-08 · 1 upvotes · similarity 0.42
- Quantum Audit · ph · 2026-11-09 · 1 upvotes · similarity 0.42
- NEXUS-Q · ph · 2026-11-04 · 1 upvotes · similarity 0.41
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