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 0xd770df3969fc4c2308409c5aa57b95d6a831dd9da2a71e56fae83faaeb834b4f. 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/75962c03-f8d5-4b51-8a01-c7be07b63956.json and https://artists.proofprofile.net/proofs/artist/75962c03-f8d5-4b51-8a01-c7be07b63956.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 0xecdf67dbfa0554971e388b8f48573cc2912fa73d7a43a6ee8bdb67ce594b4410. 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/USWL12401697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf93b71b17138ca941816976ef619069a65a65b7d478018e555debf80e0b9641. 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/QZW9K2309526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4934ca64850bf2e83097f05ae397aafa9389436ba10b3ecf5c6edfcd392d391b. 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/UKXN22329397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ea378fa987678df29291392a3f4562934da9e0b6ba90569c308a95b1d91b9d7. 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/USWL12301411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0179eb7ddf9eb69bf29f82bb47339fa21fbfdbb06dcb14b7848b071242c03a95. 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/QMEU32307149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd28e4cb052f02119ad6e3ca06e795cce33a35411fcde4747eb0e5e329a1b6d70. 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/QZ7362300134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71df123ad47faa39c7f456d372ccb4baaab7225ec373933ccde250b389fe3a06. 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/USWL12300114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f026a95aafd4a7c98e6605491b46229f0809452ec8c7a1808256113585536b. 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/QMDA72213395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd654d924c49189cda8285a210465ff91cfcdbf0d04a9c9f86f9751f292a304b9. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ARIXB2206174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x858bf0950388ebd8306d98dc70f3c6e665798c780232905f51c418ba6e39dbbc. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USWL12200759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4710a2650c3735c738e745bf6be79619cfc4574472cd115709f472af0a49c4a. 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/GBLFP2201900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e849acdb10ded28736d56b39f9b0f1cceafebf0aaf2d2cd5c8f28b5bf932d37. 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/GX3Q92072544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7602318519960986f16abe4fc09dac5d8ce79f72ebc131cde8f33cdf686b8ea1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/UKXN22138372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe48e79f1e1905f06324169780b596dca821c95f1894fb8866dfba79d636e32dc. 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/ESA012082317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x321c006b0a94b09fcbb2ce9d4d9bd62211825fd6cc8f97dba9e6fd131e11fea9. 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/USWL12000208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c50a880b4bd3da9c84d7a891423ab30df54b4fa00df459aaad10801bff4cfda. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZFYX2020538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e5a473e705deacb9c44a4a032475c702d1044113a5ca3181fc1679fbccaf33a. 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/USWL11900130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecdf67dbfa0554971e388b8f48573cc2912fa73d7a43a6ee8bdb67ce594b4410. 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/USWL12401697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x942a7afd0231ea5c0ebd0ba251b67fe4a859cd51e7260a0f6bf5b8a9c3990ad6. 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/USWL12401694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ea378fa987678df29291392a3f4562934da9e0b6ba90569c308a95b1d91b9d7. 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/USWL12301411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cf86277b8cac99856e4bdf9ee322432181854bb8c3a63587eccc140b512ed1c. 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/ES5022203141.