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 0xc08fe7076fa2e009335062e40c2924972562f0c3d19150a4ef932307cbdd2b3d. 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/e9f8c3a0-a4f3-45ea-879b-2e7f240f6550.json and https://artists.proofprofile.net/proofs/artist/e9f8c3a0-a4f3-45ea-879b-2e7f240f6550.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 0x6f70d5fd4f7364f5d937275eae5bd707c22ccfb203548e3b46c25b63bac90e0c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/SE3OH1707052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0172b195e9df104b0460836411b3689c46a2d8f2edbc7f8a9ddb5ba9756bce64. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/SEPQA1800034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dde42bd675fe14188c9e34ea5fc18af208a7081e3fc48fc197d2e728942117f. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/SEPQA1800259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc32a71688c6ed5bc4a8bc2c94e1e31acadece134ef869c966e92e561c095c64. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/SEPQA1800332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebd75379c71a3d2f541db506d96acfa0f9217b6f5834ec43fc9b73dfa0a74574. 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/SEPQA1800344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6d3a371d11985302712b1378dd6894b524b600111d8912ebda237bbb28caff5. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/SEPQA1800345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35f2e9250c22a6871f5050d6ad9fc5965b3fd6f2aefcba2cac302522218ffdf6. 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/SEPQA2000042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a480062c84e297d860791b929b0d434108b3cf20dad26e5998933a5851d78c7. 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/SEPQA2000126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdefbc66b8b4e30f83e35c15b77fa73444bc12e7506b8bf4b1cf69c5797b6f5c3. 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/SEPQA2000127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3203083160d24b8cf5de9cd6386dd9182005a2c89cea3b8a265f72c22d851b49. 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/SEPQA2000128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35f2e9250c22a6871f5050d6ad9fc5965b3fd6f2aefcba2cac302522218ffdf6. 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/SEPQA2000042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5570bcc9e85ad4c480954c15189963e59160436634350e7a8ad673126ad17f4e. 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/SEPQA2000129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc222c8ec5be9a8b7824e48df3b15b9f72f9acdfa86bc98dea603e3c634fce270. 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/SEPQA1900137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5243b42ed710144ea4e9e99e54c86fb8cef89142f7cbfa5ca18e38e684e34fef. 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/SEPQA2000130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa71bda107733669203938cc6eb048bff1022619f0a2e7619699287fc82b0d511. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/SE5752245232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7bd25226fe9d52d642502b0fb6a1557a7dbc45f05ada6df52af6d9d0e3edf44. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T22:02:36Z), 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/SEYQH2300301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb673a50c829d4e849370ef122034c0d59f6e4b817932a2350ec4ee97e2993054. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/SEYQH2300304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a18ed4046e48b4b26a9c69578cc63173846598545b5982501dc6e8549bd0ff9. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/SEYQH2301501.