Tack may refer to: People Given name or nickname Tacks Latimer (1875–1936), American baseball catcher Tacks Neuer (1877–1966), American baseball pitcher Tack Wilson (born 1955), American baseball
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 0x33c20d4530e93230a01813c774d080e46e9d502d1af02dae7825734a4ffa6988. Chain 2 (Bitcoin): anchored in block 954028 (2026-06-17T01:08:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3a451489-9c8c-4091-80de-16049a9e625c.json and https://artists.proofprofile.net/proofs/artist/3a451489-9c8c-4091-80de-16049a9e625c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).