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 0x7872954018a6363aebf2307338e4b343d855e1053f1bda4ed77446a7197a4301. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2eef9a8e-e7d4-41bd-8130-5d474e187c9a.json and https://artists.proofprofile.net/proofs/artist/2eef9a8e-e7d4-41bd-8130-5d474e187c9a.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 0x0319dae6a577dfe4f766266d6993f56c9fd83ab5acb8fc9e097f6c62399613fb. 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/UKN6K2003250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdddf5155f953fdc3fbe0b339529aa786dc03439bad73ad2209d864e990cc4887. 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/UKN6K2003251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecb4a98a6d87ce990dd9a7b157d96602a5cb7708c26a451ab0c11f4226f9c088. 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/UKN6K2003252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc12a3351e6afbd457cbdabd6743c46600d67fc5a126babddc0b5c4222d523d0. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/UKN6K2003253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc63a9e664cf2a73852b6167dbd29a8bc97a63b4d05bd44e3261edba821c54750. 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/QZ5FN2009698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c7ab30a1807bf4727618a18bc047069e6032060d0e5571262ac4b5054ed5a3. 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/QZ5FN2009699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde3148262b4aa5637580ed9983c4d1fea9a6e376f6f4a9fe3f4a1f5a45787b4f. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZ5FN2009700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07a54e86d2941d83f5a5dcc0fb55c8ef8511c2bded4167081cc79de12a5d8689. 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/QZ5FN2009702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52de00be8f4526359614fa2140b9fa1575bf919525a15d38e506570227a48256. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/QZ5FN2009706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a140915ba40fefb12c4a96d7438421aa9353bc692a5153cf9dbab60ee6f0bdf. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZ5FN2009709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8123a2534ed8b57de09e1bc5429cb40b132a17b35c5ff50303e7fd8d323547. 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/QZ5FN2009712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44d9a868f1caf977c64f74716247b3472e2eea7e80836d8c6ea258e70ec704d8. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZ5FN2009716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1be4f2c18a4f33cdaf67baf1bfdcf5e2bf7658bf70a8c43b497e33a7187c2fef. 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/QZ5FN2009719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d17a106676a503b69ee06f4350de9dace0243b5a3c08978ffb1414e27c08c65. 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/QZ5FN2009722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eb927ca860f151490bbe12433f7f14c3908b904b05b567ec37c49921a9ac6d4. 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/QZ5FN2009724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x340569edc67e892d1c2e219c4176b8515e3a43f3375cf57474413dcb9e3ae1d9. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZ5FN2009725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad57d38f0efbebea7b92628d37f213439fd9c1af53df45649ce06f6a524bc258. 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/QZ5FN2009726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf13563b23ef388ffacc3660ff7a92ea9f73087d8dfa36987caa4d0dbf9c77b51. 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/QZ5FN2009727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aae6526645ba7bce80dcec9ff5cb1c34e1602b83c035af46319cfe3a920c8f9. 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/QZDA42184559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x530e85899968e00de4c61cefbf0987baf25fa93fce808d0a7e50f3dbfb560259. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBKQU2382307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb47ea51a6fa56d7d5b94afe46676547f62017ed9d1ee4aa394246d9b3d9cfb5. 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/GBKQU2382313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de46d8328d24bf5f6cac5f8889cf993e0d2a65048d099c93e06fc6091de2aeb. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBKQU2382314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1956ad735c17d02dd1d3ba2d6a5b9daf4fc741b08e639c8fb01f087286711cd. 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/GBKQU2382315.