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 0x71f8d2c4bd91d96f39c86301b3c475b181c9696794ff0ae01ff006b4787bc70a. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bf974f2d-54a2-4ce5-beef-f26173b16d5f.json and https://artists.proofprofile.net/proofs/artist/bf974f2d-54a2-4ce5-beef-f26173b16d5f.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 0x9e8e41713740e8c132f4998d2351bc2b01f76330ebc38477145664475ddb91e7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/UK35D1700117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8c32c230221eeb58fdf8ebeae585bca592331b2e1a452e1e991722ac2718901. 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/UK35D1800134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf8d3361d9536068933ab38f4098c44e5ed74adde5b693ea91f0d5a495d95f15. 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/UK35D1800138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e8e41713740e8c132f4998d2351bc2b01f76330ebc38477145664475ddb91e7. 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/UK35D1700117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c0df62badae833991f62e6c06d1bc6bc472a9bc3791f7d173d43eb8410bc357. 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/UK35D1800121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8c32c230221eeb58fdf8ebeae585bca592331b2e1a452e1e991722ac2718901. 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/UK35D1800134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53ff9eae3c7e1cffe72dd6282ae371ff0d0bc9f020b20dc35d438c6dee0938bc. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/UK35D1800133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf8d3361d9536068933ab38f4098c44e5ed74adde5b693ea91f0d5a495d95f15. 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/UK35D1800138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e8e41713740e8c132f4998d2351bc2b01f76330ebc38477145664475ddb91e7. 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/UK35D1700117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0b20b551e5fb51fd6ef361e00057526516ac19e0832eee28a1c9b91b7aba64a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/UK35D1800139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1096eed85a1b71fda0a479ace9755315719c5b4bd5d5c68a5f7089a8e9f77c2e. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/UK35D1800141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d76076a7fa5c9113afa516268864d0c28daf3c463cc806be17b77405ab77319. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/UK35D1800142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc90721575d096283bc8cefcffe25d513e649abbca05dadb4cc0c42bb2a924822. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/UK35D1800143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c0df62badae833991f62e6c06d1bc6bc472a9bc3791f7d173d43eb8410bc357. 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/UK35D1800121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e8e41713740e8c132f4998d2351bc2b01f76330ebc38477145664475ddb91e7. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/UK35D1700117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c0df62badae833991f62e6c06d1bc6bc472a9bc3791f7d173d43eb8410bc357. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/UK35D1800121.