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 0xb4b806b528a7a755d0ea5ec6f1ea5c649ff1a7dc3f5720e9ac6ea73db0320744. 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/fcc56b0c-c508-4d5c-9782-34e856f3853b.json and https://artists.proofprofile.net/proofs/artist/fcc56b0c-c508-4d5c-9782-34e856f3853b.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 0x66ce94d3f4607b9d56c2ee5c6d748ebb41041653326e1ccd2fc64f0b15c95894. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZK6K2334604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa984c5d25cf62da7e54bc2888527264eacc7778708433ad6199c1e5f0e604e6c. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZK6K2365953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44dca2d8053877fe5e285f0fef548d33503527896b03787b567b43a623f42589. 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/QZK6K2376834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61d718ec27ef265c2cf187e67e229fc9993c2339a9f611012fb4a14f495e1ba5. 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/QZK6K2376835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcde5c1fcaa2a9d402ae2f98b0bb0fa4af00000fc3493820a7ea5e8a16c1bce40. 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/QZK6K2376836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22d3a45880c0aba0c9756f943f6545780d282a93f1cf75c18142b0dc4fc7c47c. 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/QZK6K2376837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x211752832024f512cefeb5509dcaec8c8db1239f10f4f3dd8a270c11d0646832. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZK6K2376838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99e6401dfa1a6bf0cd43db96c48e3f9f6244eec03284d39b5ff0464b71aa28af. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZTB42346086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3032b0ae74ec0ee0ed743769a837fcaca217920155c59583a61a957600dc534. 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/QZWFM2470356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64fad81266970930262054154e0dd41107b25dc321c07696cbd3304c5a69b909. 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/QZWFM2471983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc90a25ee32950d4332b6c8480336f89dfcbdc2e996a1efaf3fc4ac61c6adccef. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZFYY2479975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bb7cfde98d557adf9380e871f35887b5cd4e1af03c4acde02e0fa582d1afeba. Chain 2 (Bitcoin): anchored in block 958579 (2026-07-18T16:26:17Z), 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/QZWFN2469468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c459aa6732136326f339453d799702dcb33bb87b7c8eea30a73abb30e1be78c. 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/QZWFM2471986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb39ec3046dc0bdb471a120c3fb3911862482ff6bde49f80de5a1c4b092eb70f1. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZWFM2471984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8eeab4849dcc6a5a0037c81cffc380a6614fb051735088b90f606cf26af8d8b. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZWFP2596031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33c9cecdc62de0dd409ea10be0903734692ad9423a14e2aa9a6db53426995f40. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZTBE2313546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa807bea4c7f4d786d7b8ab21180ea431a754d64423b3b401930aac1b42c136ba. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZK6K2371098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53404cdbbaf91a4f6ecd2d3760618bb80c4e9ea7be9e8cd15c600fd6bcd3610f. 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/CZCL52200014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa813a7acee40211572d20473b84b57ee9e72224281ec0a0acb7833464acd5f99. 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/QZNWV2198142.