The S4M () was a Soviet special service pistol. History Due to the politically devastating nature inherent in this design, the S4M was kept highly secret. Information on the pistol was not known b
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4caec6de984c94e0c32dfb1d97bebbfc61e105ab3ea25da7ae7c9afbff67d0a. Chain 2 (Bitcoin): anchored in block 954742 (2026-06-21T20:46:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fe3e9f9e-c1bb-45fd-a67b-2341a3c66755.json and https://artists.proofprofile.net/proofs/artist/fe3e9f9e-c1bb-45fd-a67b-2341a3c66755.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).