The Chessmen were an American garage rock band from Denton, Texas, near Dallas, who were active in the 1960s. They were one of the most popular bands in the region and recorded for Bismark Records, w
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52fca3b69c99d0e17c0ab155915f0562d69919328c5b969bf99436759f24023b. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f6dc55a2-17c6-4208-a8a4-b4600162f4ed.json and https://artists.proofprofile.net/proofs/artist/f6dc55a2-17c6-4208-a8a4-b4600162f4ed.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).