thumb|Tachankas turret used in WWI.|alt= thumb|Tachanka armed with a PM M1910 in the Huliaipole museum A tachanka (Russian and ) is a horse-drawn cart (such as a charabanc) or an open wagon with a he
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 0x5ca537df06149d71dd69e8ca5baf812d2d6a02698454030b916d93ff93276778. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a7e7732e-98a3-4745-b5ac-a4ce5e0faacf.json and https://artists.proofprofile.net/proofs/artist/a7e7732e-98a3-4745-b5ac-a4ce5e0faacf.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).