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 0x8b62415d39ce65f7c6b06de24708bd66e4079aee2e8871bbbd24c4ab76436e17. 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/29e013f4-98e5-4705-a9c3-e4ab82694bb7.json and https://artists.proofprofile.net/proofs/artist/29e013f4-98e5-4705-a9c3-e4ab82694bb7.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 0x52d3b7348990a997eb959f0e31328afdd98be486a59ed640aa74565bfe3c5839. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/USA371552382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b5ee67be07bbb514e8880ab4ac03ba6052ac75ac3b01384b437fa093cb64fed. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/USA371548077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72e6a7dc7b03017ff5f201d9cee3b74ab7310e11cdbf7c59f2ccb6b954d56305. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/GBKPL1973365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11e1713e23e7c5613e0230082d6d3dacc1579871c7c5876d2f14a21842e9b891. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/GBKPL1975095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbeb225bd0502ea09884b90da676df5341cb601c3c92de63344eb2cae2e6d254. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T02:42:37Z), 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/GBKPL2015056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae0801e0713e0f103720fac2118f4e2fba7cad5dcfa5e4da34daf5ccabe66926. 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/GBKPL2151747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae3539af23281c0e0de52e323f59a1269d80eb6cd5e81f38a7ca93f3bd44c07b. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QM6P42466430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bd14770682cf6c055856e022c15c4a99734b919e5f869f902b096ec6e95f187. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T15:10:29Z), 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/QMBZ92456771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x451e1bb6e5e382d19281cf36c1ecfb250e3e2c1cfa4727a6c78c9fdb81dd3485. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QMDA72475630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd9638a1ba6bc6e15eb54d3cd3df1e3286c74c19e3eaf75ddb2fdd12f256a79b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM4TX2505468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b581198088f016ae9f2ca281e8a610bc16e60481f80a12a413e1a493942672d. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QM4TX2507360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d94c7aa46a6470f0150f4f44e0a3eb6b08f8db83f186e1d94f6d41fa7609cf8. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QM4TX2507378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ab0eae536060df7c3af39c201aced41e3c9c5689f89707c943788d9435a097. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QM6MZ2543773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8fc1ffd4c6fc9558716dc5d0c0c0874ecb9097ebd0e1bb5c24cb93a0902aded. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T08:27:47Z), 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/QM7282559314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5468ed19f6215a9a156ee49cb71cae88abb3ed9f307b1525be76c95d6ceebfb2. 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/QMDA72590547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d70a6f2aa4af22b02aa9973f95e50860c35a16cadf7231b4cfc90e91bd52968. 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/QMDA72590556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4a91b340072d7744afb053c7326908811298f70f59a3ef61584b8c26a700739. 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/QMBZ92341416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2d7f2d7315748b2a9e0195ba21ffb0d67caecd255bb42569bdbd0d08cf102fd. 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/QM4TW2351342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a414c866e79541efb175385fff6fbf6d0d2dd313627c0b3de0aa62389bfe3a5. 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/GBKPL2277897.