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 0x88b4b4af1a5cd44bb2ba4d38cb2e15914b3a3dab19820ba7bff4f1c169dcce48. Chain 2 (Bitcoin): anchored in block 953812 (2026-06-15T17:06:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f7840975-59b5-4797-bd71-cff3b30ac85a.json and https://artists.proofprofile.net/proofs/artist/f7840975-59b5-4797-bd71-cff3b30ac85a.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 0xf6b3d60c287f8e1941bf04dc8a36888c5e3a3a6fdd015856a3c042c96cd6fef3. 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/CA5KR2314362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb862c9ab030cdf3390f28a46eb932d7c0a2be5ed370a2cf8ce621ad8ed680ee5. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/CA5KR2314363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3da8baedf123d941b078af47d27134f577144d076797ac1fef5753bcf98e86c8. 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/CA5KR2314364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbe009e0187cb88b91ebfbaf7b49d58b4a623a1353d41f3103930916b562e2a0. 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/CA5KR2315118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa258968f2b5074237afa7d60386efcb62a42e92dc53b60f0c7e8db523a867c9c. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/CA5KR2420727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63706debab5ba6c92b6a5d1f03f2d136949f715ec57fd3e0d2d6742fa7c2033e. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/CA5KR2454634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77feba47093bda314a24495f3683ea658644228f340f2e8606494e28d8ba472d. 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/CA5KR2433410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3386b97b27d093bda427915efa231a9f7c0664517145da94a39a69bb9d389e1. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/CA5KR2406360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1e5fb7885fff518776e7b8f8e638429e7dbff7bd083a807140251579e495602. 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/CA5KR2349089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb862c9ab030cdf3390f28a46eb932d7c0a2be5ed370a2cf8ce621ad8ed680ee5. 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/CA5KR2314363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3da8baedf123d941b078af47d27134f577144d076797ac1fef5753bcf98e86c8. 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/CA5KR2314364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf2bd8da76ec8c1c74fb3f10ddc05be0d682891781a00c2711ee2dbe7055db8. 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/CA5KR2289884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x976d3233b18e5181adc6f041da144542f681981f94fe68aaf94df7248d512035. 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/QZPEW2253172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfd9dae9dfebe2e55e357cd1457401ce5a938a6e3b170550f24f19f13c0da815. 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/QZPEW2253174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d4934f91217ea6a78c0eca7a31949e177281448749f211475e8fd2d49eedbcf. 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/CA5KR2478166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b2b3c348de6847bd4dd36c356790bb6b312ee3866092c7005a5825ed7424c3. 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/CA5KR2485244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa679cbcf6418ab0584ee7fdbbe65b83875867c96acda46dad8a1c759d2bb0fcc. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/CA5KR2484857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c705fe94a9f75184de54db80813ce4a9203e997053f42d1729fbbe63eb903eb. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/CA5KR2485245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63706debab5ba6c92b6a5d1f03f2d136949f715ec57fd3e0d2d6742fa7c2033e. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/CA5KR2454634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77feba47093bda314a24495f3683ea658644228f340f2e8606494e28d8ba472d. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CA5KR2433410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3386b97b27d093bda427915efa231a9f7c0664517145da94a39a69bb9d389e1. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/CA5KR2406360.