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 0x60c621fdc0aa6a2cbae689210d4a902c0cf6bb1ab292bbf968a6dc7ccd5462cb. 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/3375dc93-c8ab-4f29-9ae9-11ca63773465.json and https://artists.proofprofile.net/proofs/artist/3375dc93-c8ab-4f29-9ae9-11ca63773465.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 0x48a2d8dbf580d668b7db466bcd146916f0c40c5e95d9da181eae70f79e75b9e2. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/USX9P1417115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3934f64775bfd1f0058c30d085b8d5ed918614ac2176ea0576a4dba4f997c9cd. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/USX9P1417116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4cb6cbe1e8ca20019246c3d8509884d3d23a3be2ed4c064139f45e6c85cdf0e. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/USX9P1417119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66d6d69808b5a17afca766cdbc526cef482965442b2bddadd3580ef61e4a0215. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/USHM91382143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d21fb15115d882126cc07fcdb1af8054e6c974a8265bf08524309962e24a833. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/USHM91382144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ebe9107c5e553f4060a3eab269586658ad7beb656204fe86ff63604f2da8225. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/USHM91382146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc255371c256560f3c33f4359e5060b278c9807f48a24076769a3384c54967dc1. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QMEU31517533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eda4ebac8b10d067aca059c955f567629674650422aecc654c094d8abc8a7ad. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QMEU31517536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41278a1339734071f6a1196925ae678edd7931ce24b953520d9b4c33f8aa8e8e. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/QMEU31517537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x269ecf5ca0b13322627b93fecbe551ec9efbccf4b7b30b43efbfc2aa834e3d8a. 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/QMEU31517538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x348fa720bb2379f722b4f832b97cab0bb4c0992f5449ab5b209fa21add7092ac. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/USHM91665069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cb959469b94ed28705b16e479054617abcf4ccbdd33a0fcf6ee0ace222231a4. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/USL4Q1880921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b4114ba935fe05eab4bebf468ba07f397cf783b6624ab0449309cddf2cb57f9. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/USL4Q1880925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e66e77962f055fd4ffaa1e2cca2e98ad384754da4c48210de27f7f9c106afd3. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/USL4Q1880927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c67d20d0df9da6687e4bc6633179c6fc6ecef02529d169a7e52a224b6bb979f. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/ROAST2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e775b092a86fbbe57036409abc9e0c0d1f1d603beec9f859f114424614008d7. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/ROAST2200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e280366f752dee1151fd11d5e1fa617f0c565093b632ab0caf2bebdc215934b. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T13:26:15Z), 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/ROAST2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10358472893f6618ce3e7b21bb58a1850bca3f70f70cd549b1894a26f9b17f9a. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/ROAST2200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bdb62fb972d84220fd50eeca9308b7bcefd7f67d5d99ee55fa71a25332ad86f. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/ROAST2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf92c07883010a084195286f64edff6645077e0b437d4b1474555a66ee5e7fc10. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/ROAST2200005.