thumb|355x355px|Octeto Buenos Aires promotional photo The Octeto Buenos Aires was a legendary tango group formed in 1955 by the Argentine bandoneon player Astor Piazzolla. In 1958 the Octeto was disba
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 0xfd0a4ddb687d1108525163d613b09bd1bf16a0ece649dedf77fc4830e1d269d5. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a0cf114f-fe91-4a73-9325-cc9ea7e76231.json and https://artists.proofprofile.net/proofs/artist/a0cf114f-fe91-4a73-9325-cc9ea7e76231.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).