thumb|right|The Paganini Quartet (Henri Temianka, Gustave Rosseels, Charles Foidart, Lucien Laporte) plays the finale of Beethoven's String Quartet No. 4, 1956. thumb|right|A program from the first co
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 0x2ebd8706955a7bca4c2cb18e40d229164534516a91eb4e5e7cb04ce3bb0c11a3. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/39d81316-6554-4423-b7b6-6bf1f3922505.json and https://artists.proofprofile.net/proofs/artist/39d81316-6554-4423-b7b6-6bf1f3922505.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Haydn: Quatuor à cordes, Op. 76 No. 3 "L"empereur" - Mozart: Quatuor à cordes, K. 465 "Les dissonances" (Mono Version)