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 0xc8e1a3cc4b542fb9558ba1bb7a9960dc2ef9c759c1f5102196361965807a9b47. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eb7dbc15-bd9a-4632-b7b2-820a334d4053.json and https://artists.proofprofile.net/proofs/artist/eb7dbc15-bd9a-4632-b7b2-820a334d4053.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 0x5af389a4a2754d6f133ce5825de8ad4513debf2b953613d54ea0fac6a38470f1. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZP7F2405626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49d0ef884f3f57cae67eb68e81c907e9f0ec7bfaf078f6bb8be27969d32331b2. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/QZP7F2406705.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb30711730b1b20033a80c38cd39e69ea3962598a8683a6836b844b868b4212e6. 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/QZP7F2406706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8a68ac0e954954787db0c30d744adc5d34a1c3b90aa73ad6fe5ac6287ad993b. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZP7F2406707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ed9dfde8e6dd11565e34625130c12240fcdb140d371edf311c9b1905f6442d2. 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/QZP7F2406708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35af4f350821421f51ddf715adaa4ddf9447f4afcb90a2cf38f5c823db1efa12. 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/QZP7F2447110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80bd94d7f909c68310b1783315fa2035619baa4b7a21de42c69735fa61d8b7e5. 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/QZP7F2447111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7ec8265f9d001676a6079bff7eb2efd8872276090fd4b64662e215470cd9d62. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZP7F2517259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb9d9d5eafc5614a22ce409de6d05884d3dc1d539e34fed8aa598dc82d9974b9. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZP7F2517268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb07c12f7ae2b2fdb4c69a062e15b730beeec109be71eb451d2f5507e4de84ac5. 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/QZP7F2517269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x582c8fc79aacdbfa6c178cf1a8a2cfd2b9a82ca065e598f5afd58540c8aa4def. 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/QZP7F2517270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf295572b1126dd4b0b1310b701456f22b46343958c600d944ecec623c4352f4. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/QZP7F2517271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x333039eaab62eda368b35673cfa4e4bd1003e96fcaa93be66ec60e3231a3eec4. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZP7F2517300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fc480f620c9cafac330f3ed817e700fe1a19adee8a4fa69e0878d00d8bfc9ba. 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/QZP7F2517705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8fd8b1af08b53439b24aa05d95a10df68afe41904e610429bc53c677bd42fa6. 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/QZP7F2517751.
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