SasaSavic Quantum Shield™

What it does

Prove a file existed with quantum-resistant dual signatures (ECDSA P-256 + NIST-standardized ML-DSA-65). Hash locally (SHA-256), dual-sign ledger entries, anchor to Bitcoin via OpenTimestamps. First known publicly accessible (as of October 2025) quantum-resistant timestamping service.

• FQ
  Free Quantum-Resistant Timestamping API (Dual-Signature and Bitcoin)Nov 2025 · ▲5

  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…

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