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 0xe33e97ca7641b2a1574d47ae02ff6aafbc797b3fda7fb804c799fa7a0fa488c5. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3b502829-9a56-4569-a377-9e7506cca973.json and https://artists.proofprofile.net/proofs/artist/3b502829-9a56-4569-a377-9e7506cca973.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 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 0x35498ab2efeee05e94a2e7d47a2a3477832709ec09a62c363a6d3b5afa5f83a4. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/PLB841400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x301fbb44eb3434bc62897719c2d91e7ea6c5bfa05be6ef57b069e185a33fcc3f. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/PLB841400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbf5e487f3b5b663916091aa059edc806f7e639a2a1eff49ed99579b6196810a. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/PLB381601015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79362b704dbc6da58f2dbb633ec686c9231fd3590cc51fe42d16aebca79f5143. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/PLB381601017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadcaca30e8f8ca90cf87f7963db41d62f3947b3eeff72951a3161246d71858e4. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/PLB381800064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b4d94ba56c9554adb4ec8b8d2a56b3877bcffe85b830b71d511baeba5d7ae67. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/PLB381800046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f3afd4c5be2d69c936ce96e51060e85d6e89984ed9a15d3aeba3a4aa0413fb. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/PLB381800051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dfe3cb0a49dfa6043044f82283e9899e31eaa0aaf1ce23e2ebad1266ec9c674. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/PLA391928603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14d0d2f1c4cc7528179bb6705e4bc2d6c6e5de9c627f6367dc4109aaf8681f55. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/PLA391928607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eb3f7e764d06d4c322b9cd707c09f5b5806e3418539c4ac89138eeff5d22df1. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/PL63J2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac0debfcc68d48a40de72ee9a8ee8d94bc37202e7533fe8ef9ab728b6a875d0f. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/PLH492351891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774a622ce743b911a0d7759e2700cef01cbee27454d845b697ae4a69bf50ec22. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/PLA392500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x414b8cb84415840d12b6d48b00b5ed6cf284bef568b3b6f84d840235cfbc12b7. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/PLA392500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774a622ce743b911a0d7759e2700cef01cbee27454d845b697ae4a69bf50ec22. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/PLA392500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d3f278c718b2d9ae0ff4f69baee007bd40d03f1c7d09041ab030ccca544adf4. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/PLA392500010.