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 0xbf64cada30b8d4dd1d53868d3ce27bd05d17966df636cf52554e475f049d3818. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/66e1b60f-a193-4ccb-b241-769f8f4ca225.json and https://artists.proofprofile.net/proofs/artist/66e1b60f-a193-4ccb-b241-769f8f4ca225.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Sixties, Best Of (Le meilleur des années 80)
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9579b0d460ed20512f39cf707298a3fc57034588d2346fcafdac2c482cf52ba8. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-16T00:14:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR5Q18300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x671bf081f9dd3f2a7fc331a3516c938a8d01f6b7c8da3c7b1b6b470efeb1d93d. Chain 2 (Bitcoin): anchored in block 958625 (2026-07-18T23:11:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR5Q18300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7885d1f837e24d94e9646321dfbcb6f2809813a34f3ed8ff9cc75c4a8ce468a. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T08:55:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR5Q18200014.