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 0x950bda4d25a4d9e4322be4823c6c5db95992461c30f06993cb20eeb82904deaf. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/81866fda-9c00-4d58-a7aa-a5041e110d90.json and https://artists.proofprofile.net/proofs/artist/81866fda-9c00-4d58-a7aa-a5041e110d90.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 0xc87ff70a5a1bdef4eb898ea277538bcb86b35a4307e0974a2ac336082328d253. 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/NLHR22000226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fa53235bba9628c6551233d035db8068732ace885096305a7cb27175886af50. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/NLHR22000227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1edbda7c5dd0fd5db0725a6a6e23d1d881fbfc7e694e9bce8d43aa8c4c847cc. 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/NLHR22000229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf121e5a31d827f57aaa6e3050a0ab8052903e836d62a8baaa3e8986342a3d7bd. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/DEH742001625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b590fb82661d32985006e9929fced17c26b3cb42a96e30ce2de95692328b9c. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/DEH742001626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c7fffacf3e6beef53dabd901f977d025f6110dfcf05393d944eb030b108a649. 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/NLHR22001074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc7b21b857a674e94fee0a2e99b8f97a80025d3ab37b7c8230d0790cca0ae4b7. 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/NLHR22001075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97c5a901951c70ce6f4e9c055de290a27db1dc3fa667058e60d1493c7ea2951c. 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/NLHR22001078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x913cdd5152831177d16e68c1f384dc578690ac60249fb86dc08e1dfb6ce4c653. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/NLCK41099053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29e2c552929d263c6e218c4c56b62a3657dc83ad9ba2ed6308371ddc6f52a12e. 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/NLCK41099055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0326520d4654819ff23a285fc5acbba920d4544450a3ac2a08d044a4b02f7ddd. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/FR10S1877282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ab7524004d0a5bb6b0f549f71549f6f4f2782f07d23d4d3462d63ce6ec68fde. 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/NLHR22100398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1906cb14a0e67f86a2244d950850c334753a3d19adcd870a2b7506896283f888. 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/NLHR22100406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3df8c3813d6e95e1ed6821ed8510beff7b220fdbfd6cc937950a3c5ca11ed94c. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/NLHR22100408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52e46ec377095b0a3c671a85acd814965c82a77e5fd5379a7ce80ad5ecf84447. 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/NLHR22200368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c3ed4972c5bacb5babb0666a52f457b851a61f09c38e34ab4a76cf862f5c6f8. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/US83Z1802702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd06331f470ee77fcc977cb09d02feeee0fd5317e4e1541da66aa04987bc2d963. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/NLCK42234843.