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 0x037f485e2a052007b862e5008196783bc5586f17d42081d50345a45f498dad6d. 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/95bfa6a1-7bb4-44b0-be1e-8d50fdb39e38.json and https://artists.proofprofile.net/proofs/artist/95bfa6a1-7bb4-44b0-be1e-8d50fdb39e38.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 0xf6462ba984ac60fdacade9682926df33141dccba9b41201c3509a3a5d6d13f29. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZES62161197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1abaf6a70af556796dac3a3d0fd48af0937bcb2b65deaf8876451a6e47fc6cfc. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZK6K2118666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ddf5ea4c41bc8d538d187b15b5664181b6a9e3d32d8b90915b6e196528cbb1d. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/QZFYX2240997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9584a99d31e0467b157bf1605bac6e77169cbd8007145a73b0bbc48b885febfc. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZHN32286721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7879cce538a58ff7bb9e110c9ef555388505d41eb5891ec166e8b9d4cd3e1c23. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZDA82396979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11e25985e90e3e584f2c1a4a18a896355000efd1ba4676a02b1750364f819cf9. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/US39N2309071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddcc0e4400a279ef37852b84066f3adba19f9327ee2a574ef4afe596512c936d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/IT0R62300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92d9c5f3b706160cd9f34ff4b01d45a0f74e2a2c446894b7b77c8d30186b3324. 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/IT0R62400117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d093f8bd8949cc8a4983faa92bb1d1ee338b5f02bb544b28f0c3ca09ba3eb0d. 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/ITZRF2500045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf45a9e7a7a4186237a7a0f40c216529315bdf5972c027da068c444adbb1f5cae. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/ITZRF2500044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf9fb278da082597709ddc5ff738857b4457b21f9540fe539235ab369f18bdc9. 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/ITZRF2500039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d093f8bd8949cc8a4983faa92bb1d1ee338b5f02bb544b28f0c3ca09ba3eb0d. 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/ITZRF2500045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ad118a8b0995d4701ceda38e4bac1200d88b08e7e73a118ee1810620be0df10. 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/ITZRF2500046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ab09b6cb06b17a0f1bfc39abff03cc5c49a117e689480d9e695617c50bab031. 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/ITZRF2500047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e635f9f1279055b88fdb64481ad3113f16bac1b4d9517ed3ec16b49d40080ad. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/ITZRF2500048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x883bfc3ff0f3dedcfa8f07a69a6218c4a1267e9d9504fa0fde3711fc210825d7. 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/ITZRF2500049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce120bf10294bb3311c6a93ac1d7cf5b3c6f05200b254ed38268676094fbe9f1. 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/QZZ7T2587771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7776e1364651e2499f10f4209eee42d4c8d75dbc3f0470a36d432769b02d10d8. 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/ITQ002401351.