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 0xd27c5a2a7ee90d39146e4c42203c4fd7b8d2bd7b49ca75172dc65de99425253e. 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/334d1cb9-bd1f-4d6a-8892-976c82b5429f.json and https://artists.proofprofile.net/proofs/artist/334d1cb9-bd1f-4d6a-8892-976c82b5429f.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 0xb76ef6faaeee70e61ad1991689828a6a99e49a2a5c75225197e21f6f1ac0d002. 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/QZMZ92473551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7499d03fec375adaf4c03d1ea63d1c33d5220ae96f649a9ada3fee48fa741c2f. 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/QZNJX2430290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee19fd84fea0acf7a201388b9c0cc67742ff8b3999693e3e04c23651d272be04. 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/QZKDT2400180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d507393e4a2bc5c2cf577bdf3cbd6b5693118d3911a1210d739acf78228bf59. 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/QZTVM2342863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd54a9b8de693dd4eb5d3a58c021c7f46a320aa78f0a05660488a9dff21726eb4. 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/QZRP52396207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2de7faf3e364f532ec4de0ef9bf73a6728354a3b68a5a1eff1792f028303c07b. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZNJX2385368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x795357699888245f3cbcfbf054d7d3a55e50254fe4922829776341dbe717f097. 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/USLZJ2328426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0045a6b8984b39212bcc2e1555ae6fd2791573acc90ad9740516e5753c7c9e66. 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/QZKDT2201395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8228cd22e1faa4418b89fd60d92132faec049c7ca265080f9699fba1aaa0745. 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/QZKDT2200937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4b205c372db4b044c866f37bd1ce5c7729c91ce4603f8e2f18d93c837a81778. 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/QZKDT2200657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f6ebe1206fe5d31f87c6844b8e0d95bce729992e24b61b949822d4b67583a01. 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/QZK6P2245924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19700a372bf4bbd02448c4b86eb72e07b1e1fb865696cbf21fa019b891afc04e. 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/QZK6P2245926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f26006fde96748ba1a727dd26f8529b6ee8643d8dcdc0984dd891aebb4da18f. 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/QZHN32205641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d288f7a2756c49d23b4922a3cccde639fcdf69a600cb1155b89e409aa23cbe5. 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/QZNWV2144940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb93f1632149554ae957d377e6a32205d522d9bde7e03b8ecba314f6e3fbae1e. 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/QZGLM2573097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfc393f303ad6bdc5d82dca8ce43445c06620f4ba3606c981eb584b4202d7db0. 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/QM4TW2576052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc34c8eaa8781dc48a9e8ad3b5539428488854b8b9410e6836d7ee15a51a4d8d. 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/QZTPX2490100.