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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 0x79195d2115008c3a92c87668860560a86b9733294a7baddd5ffbeaca242127cd. Chain 2 (Bitcoin): anchored in block 953602 (2026-06-14T06:58:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0f4b0010-4fdc-4d47-b990-c6f96c6c814c.json and https://artists.proofprofile.net/proofs/artist/0f4b0010-4fdc-4d47-b990-c6f96c6c814c.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 0x6f6ec82538bc5d3fea63ad14e8f481ad1567772818d21faa8694bb83f6701e19. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/NLCG61200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62f64d988a5f555517442035a10de770967ee9fa7a975c782f4c9ffb47807c2b. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/NLCK41019780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ce4bf4106dfb84a81d91876c2b6412a6a246e540cc24015a3f7a8465d7543b2. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/USA2P1698912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x385dd4f342473f56ea9fb907610f0fce1f0a1d128051a43dc35a71b55c15eb3d. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/USA2P1698913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfe209f6e5bc1e02fb6f56f331a08894b2d668491e0b2b558550fcbe93f6272b. 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/NLCK41042768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6940e64e73735a6a68a20cc4e126d68caff36b0c399869ec24c38a4f956b6fdd. 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/NLCK41054056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaabf6965380e9211f93f5e8d7871894f163e88e7d3220e90b79f9779966b855c. 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/NLCK41054057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04e60794c0f085ad9d445d76bb93d7d1fd70d3e8b6151b014b0a46591f39ebe9. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/NLCK41029090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6faf41c654741fb2ef0b40de9fc4bfe5d010563031ba3ad4f0d878a837387d5c. 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/USA2P1450782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62f64d988a5f555517442035a10de770967ee9fa7a975c782f4c9ffb47807c2b. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/NLCK41019780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeb4baedac67fae2672925405f0da69161090ea7411d756ce48be732f5821d4a. 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/NLCK41079962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f6ec82538bc5d3fea63ad14e8f481ad1567772818d21faa8694bb83f6701e19. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/NLCG61200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xece7f2ee454b0dfd2b7d495cd0d87f9adb136b0c383d4bffac1e07b41f179dc9. 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/NLCF11200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ba8f7bb279f252fef4bb4c6c5c060f2636c0cd8156c7a5c3b9124075110baa. 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/USQY51332765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaabf6965380e9211f93f5e8d7871894f163e88e7d3220e90b79f9779966b855c. 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/NLCK41054057.