Free Quantum-Resistant Timestamping API (Dual-Signature and Bitcoin)

What it does

In the maker’s words, at launch

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 ledger API (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/verify https://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

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