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 0xd69d524a0025ded422f75c452e6b4ce69f61bd851d66aadfb1c8fc946b8d34c8. Chain 2 (Bitcoin): anchored in block 953636 (2026-06-14T13:03:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/379184b5-9c22-4b9d-a83c-1fce86a9a63a.json and https://artists.proofprofile.net/proofs/artist/379184b5-9c22-4b9d-a83c-1fce86a9a63a.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 0x8f6081fd6dad72d32d032c3084d6126f543e2f64acf625100497327f3d6dd208. 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/GX8LE2482856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42d0f976bfe3a34ac592771808ad2fa435a966e56875f4415aeb65a4bb455959. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/GX8LE2472928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe29894c9593a19547d1ec8beacfff9d2d413507a9d38d91f11046d3932577b65. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/GX8LE2488808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57aae2a702f088f0efd92338d0bde8cd9183a1c75bb0468c58835cb7a4a03ca3. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GX8LE2432477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe34e8bc56d769e82f08d67fa537d54dc30f96ba0904865540032e67da090d5f2. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/GX8KD2594657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c76fe7991f7084ae5bd536ceaf0205309e65ceabe046d5169541f633dd8bbf2. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GX89G2568912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe34e8bc56d769e82f08d67fa537d54dc30f96ba0904865540032e67da090d5f2. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/GX8KD2594657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c76fe7991f7084ae5bd536ceaf0205309e65ceabe046d5169541f633dd8bbf2. 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/GX89G2568912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf6830c8c3338aab4ea5100f552c993717277d3e3e0979b2b4076680f17af225. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/GX8KD2528750.