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 0xdbb49620ef853924df50388fe49bc177d66fdaaeb8e61ff79e57d53c4555ef5a. 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/52a8c975-c274-451f-915f-77478841078b.json and https://artists.proofprofile.net/proofs/artist/52a8c975-c274-451f-915f-77478841078b.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 0xdb34a72dd13fc7c219a67507b510a538c56f2654bb6a7df29b868a4d1f498e2b. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZAQT2200161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bf7f2037c4e91e79bdfca9b053db1f4f9ffde6a31c5b22db08824bb18e5f65f. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZAQT2200162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ccb29f1bb74598e5b0cb693a96b658ca15400d829bfeb6d12a475cf08ee10c4. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZAQT2200163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44094bcb41e6fbb584a690f7c7a981a6d321388540f19271ee51580dab4e6273. 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/QZAQT2200164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70d2111ab06dd557228c79025ae786056ca579b60eb36dee3e70f13ceb91fe25. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZAQT2200165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc14c4731c3374d65c4cc1ebe96d38144a8ac67101b704e8f1fa548c2aa94b88. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QZAQT2200166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b223b35bd5c278788491be86fda541796541e4369f1c96a045f9f1a5a83e50. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZAQT2200167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae5c1fbcc6b7b257e70f6269ec3a7934ff1b75462ed8a7a4446376fb8d41b37f. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZAQT2200168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9be1608583dae404a40d7d63391f24b3f3730e891717a36b9adf2d30f2dd622. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QZAQT2200169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44590ad3e106ae40fd266e34a2e2b9de78b3283afce9f5e73a9c4a77f77fc613. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZAQT2200170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2c140d3bfe9b3e32d4aa10aafa0e74774e51bcbb7d3a62faf2ddc8cc3508288. 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/QZAQT2200171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafdcc6779eb0f3702bba3e1ec0e2984a2d36b3b675a0b49bdc404fb8056d454c. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZAQT2200172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76291259b347f93a0b438eef838babffc59bc65eff4dbbc722582a5393f8fd04. 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/QZAQT2200173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae5c1fbcc6b7b257e70f6269ec3a7934ff1b75462ed8a7a4446376fb8d41b37f. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/QZAQT2200168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2c140d3bfe9b3e32d4aa10aafa0e74774e51bcbb7d3a62faf2ddc8cc3508288. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZAQT2200171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb34a72dd13fc7c219a67507b510a538c56f2654bb6a7df29b868a4d1f498e2b. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZAQT2200161.