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 0x3d4de28a84413d76f6ac7dcb760af47088d821cdb86c1d14b2e4a09f1636c971. 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/8903e461-5487-4f93-888f-94f4e351fc0f.json and https://artists.proofprofile.net/proofs/artist/8903e461-5487-4f93-888f-94f4e351fc0f.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 0x342042c44cfb87423278a8eccbafce2197febc7a69b087cfc6a288a076cfe384. 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/ITTVA1700054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86c3ec03aede1fe97c9423f86c77d574605b80fabc687740e3578c9ef57bd282. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/ITTVA1700055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4adb166f4066220e7a3e66ff26c38dc8173d65ca1f1db4e05ba91ca69a8b712a. 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/ITTVA1700056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fe804055c8553cd36ea441cf97c1feefef4ab7a8172bb878936dd07addc319c. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/ITTVA1700057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b7418be7040563dab7151592776551b5cb75f6090ad5a51a94d3495eb31f153. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/ITTVA1700058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38d979dc78eaf555645ef151a1851b70e7290ebc212074adfa26f02ea79a88c3. 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/ITTVA1700059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd018cacd269d5c04ef763244e7845ee2115124fbe937720cab438041e3e117bf. 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/ITTVA1700060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x586412a38e855a104e2703495fa663389a848e5a7418c47f42ce69dc721050d2. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/ITTVA1700061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89b3ec3264f864733b11112f9ee232700b191f464edf3fcf8049c4167a60fc65. 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/ITTVA1700062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa81e760adaecf6e833f74b0e50d5bec0fa508ddc99c0315f25655932eb426172. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/ITTVA1700063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77e045f78dfcc68bb1945b40cee3d3c52aa54672d6b1583833df4d79f07dd9f7. 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/ITTVA1700064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef974ec9b79f6703434d351a59160a94462680b994c2e8cf87507571346a7608. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/ITN5W2100042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa512e5024fa721bd7d719e8639cc5133845694a92983640bc851084561e2a5c2. 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/ITTVA1700065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcbeee3e327cc2b3ee14114d7b9cc1832d3059a8d3dbb38c8d6e74facbd36471. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ITUM72100199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6717261d8e16da5e92ca2027e2bb9d89201879d9e8ec16df7e7b71b373e7abc5. 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/ITTVA2300005.