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 0x7e750822d9d79e709054203bbdc976637342f8c3baf71245b49823184abc736e. 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/4118cf10-b251-4bd3-b4ba-1e08a9590a2a.json and https://artists.proofprofile.net/proofs/artist/4118cf10-b251-4bd3-b4ba-1e08a9590a2a.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 0xc96645ffea5ed71db9d26097f0f5336c555db16560a92984b27616d05ceaa546. 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/QMBZ92063383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb847d820e00de93b550c074a5c6047bf7497156eda1951369e66249302b7a197. 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/GB8KE2205767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e880824124af8207713ae582192d7a5a5533e82a12dd595fb5e5e952b9aaf0f. 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/GBKQU2161960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c80ec33ef7a7658d70e17d4e7c8671b3b79f97b3c99a7017c2343776463195d. 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/GBKQU2161980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc42c968cec2ede80da2c4f5301411f3ae6506e70fe075abd702ec702586917fb. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:21:27Z), 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/GBCEQ2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9046cd5707f3a977e732ba61931551d0cc1e4f37d29e012aba605343774add04. 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/QZZ7S2427850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aa8d94094153fef6b38b4b22008ac6effdbdbac4c1fa0434cce4541c8e354db. 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/QZZ7L2419631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f57c5768219e6f7048a39440e4c232870a73ff7f0897ad3f043c6b06465da74. 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/GBPWR2400124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a9604f7c85c000cebdebee13a81327c9dff459ecea5c1bbc0607667ccd7b5bb. 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/GB3WZ2400101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f983866e19255536cdb88f76574fa40922af055b86fb01986a6deb5f9de56c7. 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/GB3WZ2400102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b8999a49667575b47736e37e2dbc0e4683559cd79014b52d8d8cd925bdc59dd. 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/GB3WZ2400103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ffb849b097027416729f27563841bcb4e9352f48d46f3a9d0a078943e2fdb03. 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/GBQGW2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb719e6948a96fb9ab22808f42e99ebf79d7e03a170eb3a0be307d21f49804ffe. 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/US39N2203220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11907f410f6ea0d329c04d49831b6e7ba47fdcf8b63ac537ae1e789f1cdbfa22. 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/GBCEQ2200084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c2379b4f0eaefc8a1053023a3e538830171196fae4b545acdea1c8624469b50. 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/UKXZE2200018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e61bb35cf51f78b5b95c74fe1a0cc0a94ef76808f729785318e2589da530789. 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/GBKQU2202101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e880824124af8207713ae582192d7a5a5533e82a12dd595fb5e5e952b9aaf0f. 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/GBKQU2161960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x452643fb23f1dfa32ead3f07e78638a8191b9ef43697099c4e87dd6cadf30a5e. 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/GBKQU2410942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x771b1576f58feacbb6f036ede96331e27c5e0fd0425ab98cf376b858e1395e11. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:07:10Z), 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/GBKQU2413804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50db80029691f2b20e7f88430fcb3d295dc5ea6b7875951339bdf1e3eacf18af. 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/GBKQU2413805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dafa3193baa61c071831670635d1e0a9115ae62ec9557695ea9f55ed604a779. 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/GBKQU2413807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff4fe2b9b97450768e2eac4ffde30c4dbdc8b0a5af80b0dcb9b45f273ca160cb. 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/GBVPL2300054.