The Tape-beatles (also known as Public Works) are a multi-media group that formed in Iowa City in December 1986.Blackburn, Philip. "Meet the Tape-beatles." Artpaper [Minneapolis, Minn.], vol. 12 no. 1
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 0x4599bf5051374727d07161b0b9ded1d59133cbe83d47d103e339d7df159f4976. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1f42123d-a92a-4d2e-847c-23f464a6240a.json and https://artists.proofprofile.net/proofs/artist/1f42123d-a92a-4d2e-847c-23f464a6240a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).