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 0x38921fd013c70aeee40debd8488d0ab5f2578fee3ff0439da4c3da1949d245c4. 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/3884cc3c-173c-475f-bae9-775e106b609c.json and https://artists.proofprofile.net/proofs/artist/3884cc3c-173c-475f-bae9-775e106b609c.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 0x119d0ac43aab97d9e84742593d65f2a70207d5093f045137932738471eb0ce77. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCAFR2133139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73decfafa73fcf28a392e280793c62b8dda79ed4d6486df896f21746c2f3a120. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCAFR2133140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9516f7cd18a5ed112e81d932ad11e3c19dc7cccb5bc280fb90f014559f2132f4. 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/TCAFR2133141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc3fd4e74981b5876622fde744e1bbdf6ce4aa0026f3b7e9307523f6130b30c8. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/TCAFR2133152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67a571c34749cf470129576567ae83be09749e6ea462a66a90598b8409186aa0. 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/TCAFR2133153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a3a1cd458a79bfbf3c69f146132e3f857339a66958a35d8d4f3287f53bbb03f. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/TCAFR2133157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cef59255dfca2aba515818ea22c00b0a94e460ba6a3b978ed831e7928e2a9d5. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/TCAFR2133164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7046d5f3489990e0f9036af2eba8ce90e361e681bcaadff71d18dcd5a280a2eb. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/TCADW1813236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5458ef8825962f9f77284e08cb3ff820514a0d343dc231b1220dc4a279ab8bf. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/TCAFE2025044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf69153d0b28f2e88a6347dcca40e841af75f5327d3d35530f7ffeb1aab18be8. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/TCAFE2025068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc571cfe287ff2691eab7f9835176d9c8641fc20b3d2f61553fe9a1ca63d1680b. 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/TCAFE2025071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72718cf8d031d80eac69a278eadb1f26fd609838b225e05d5e265c0749edab99. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/TCAFE2025073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85091ae3e9efa5b298e1fb4250f716ea5e01c8a55316caabb7b70676976d19c0. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCAFE2025079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae88b3394559b7da9a51e115770d12babd6c0df08bb438d4011c2607531bc8d9. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/TCAFE2025102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e0c445c2aa8a76b16af40289a81851347252562e8808e6cc464ad7a606939a6. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/TCAFE2035899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x099e39c638d78b29364ed816f6642e428547165bb0d9e060aee5b834260aafc7. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/TCAFE2025117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd86d2f2b360d9e56589d8ec1495d12431f4d6134967b907db9a3701f6188a1f7. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/TCAFQ2135439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7558d97bb096de842e19188f9443182d992978eaece13c7d71a2dd6dfa9ab9e. 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/TCAFR2121885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb859f6020fcea5a146d31a008f36af95cb5f2c86903e7d3d4d8fc464a35c2df. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/TCAFR2121894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7801dfaee19748537f678f77805347f80ff8fe4a5b139ce4024d7cb61889ce63. 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/TCAFR2121898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ed87be59437a4c6b69ea12e518475e6cd95d50c22cc1d0ca538022142bbbb0. 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/TCAFR2121913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae71cd53f72dcc9b7994711777ec1c4f8e5ab57379e39241a1f6372735f44e77. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/TCAFR2121915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7172f19e97638905bb69cacbc06d429051fd6473eaedd5bd86149fd0dd888a01. 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/TCAFR2121918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00aa83d78650f5bec3ce059f63563e02373b596ba4653fca0f8b0276f31b475f. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/TCAFR2121925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb6f923e970aa7e5ff4956dd8525c1b441393ac4e360db06bd6b311d9a298934. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCAFR2121934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4af6a4e31de0ec1ff699bba286010ad6eaae245b733a0d2c62c7681beeeea9d. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/TCAFR2121938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcae26794758b3028abcaba55eef335f6027bd7a1d7b0152ad0d8a64bb3a60be2. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/TCAIC2414351.