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 0x95d2f0ef8404b96bd6333463dd13e0efa79615107c3d57cbf4c9074cfd3aa401. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4cee4dd2-a625-4bd8-b09d-e0de745c22ee.json and https://artists.proofprofile.net/proofs/artist/4cee4dd2-a625-4bd8-b09d-e0de745c22ee.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 0x20f737feaf902f860834962f6fc3bec124f4f9963629fbfcf2a82e78540e4b5d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SEPQM0718322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e997bc987b49a53759ca3d6fe89219f5a813ba8d538c965edb0e87a84442bcc. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SEPQM0718325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b68b40e9c67197100f906fe63803cf03d80b8d7c2ac34471c9815fd38074746. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/SEPQM0718326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29b8dee70d1097ddc4fd0ae1bff9180fa1e10b97e001a79d9e5cd340b46f016b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SEPQM0718328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e185923c1b79d442b5f44ce5ba8b0f03c6d2c7fcb1846c152d04f16dcd685f9. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/SEPQM0718331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf64e8f222f5ca6a52a7f11909828ab3293d42a473c7fc5378f42dd5170fa8954. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/SEPQM0718332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6720f7b15b0e844b3b66138e9585da18762a7473e9346167667ccd591a2335a5. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/SEPQM0718334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e43e022afb515dc9d555f38b8ba05cfdce2177ce2bae403a8ebb4615c748cfe. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/SEVFZ1102101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80972d2886c49b9fd04f600f9414d736c110d8103975eeb081a9e85f000cfd8e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/SEVFZ1102105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4bcecc0b937a1fe01d1d09f05abecbda2350515193ddd4e56f024b0bc7c0ae4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/SEVFZ1102111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x072dd872195fe258384caafba7bd68d0c6f07788334a9235567e824a476a2c5b. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/SEVFZ1102112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf6acababfe95ec950b9d2f7f459c2f3f32c792b4347104661f5fda5282013a0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/SEVFZ1102113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x370b8b9c41d60001b2593b8c3c0ea3a432ca79b157a49ceb9ba1c8a8aa795f48. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/SEVFZ1102114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x323a07119826a3c4d6ddf5eec2101ff8be91b7574f0076cb6ad14bf2e0f97db4. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/SEVFZ1102117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb5bd70d31cb95b02eb1d012c77b85514f1778a120860ae13aafedac5178a7c5. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/SEVFZ1102118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c7af35ff12c2982b391731c78152175bd846cc87ded8f051797fe8c48c8d4d1. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/SEVFZ1102121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69f5d7f6d03ae645db8f77684863287bf8d99cbf1fb94e8bd3eb79a62841c0a0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/SEVFZ9820311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa35191a27e8e7e1befd5640d1af8072845e43f059d9c34c8aa6c8868a790bc25. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SEVFZ9820312.