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 0x566dbe8b68877505d295be707a92c82d2aaf72288219e5dcd5884543c26b36b8. 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/d8f7ac82-bf2b-4793-a8f5-43568d6e50c1.json and https://artists.proofprofile.net/proofs/artist/d8f7ac82-bf2b-4793-a8f5-43568d6e50c1.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 0x532a5d69b9eb2995680055c1c006a0359e4a0529637b8add73847fba5226b7a0. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QM4TX2113966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba5201c4530ce7d1d880d831693c57526c5a4023bd2d7257d660f8b196e6997a. 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/QMDA62163067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61fa02f9ac06178f33b3f2d5d6f79328ffa0ddadb182ea313b70cd066c949970. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM4TX2287210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd32471fc2b6c8b1a1ffb46689d9ad289fe3896ab53a9c34ce8ce6ddd4e0e1f79. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/MXUM72401269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5e1a90c1dedb226bc0142e7dffd08a6cc9b3fea54e68905f36a46f49eaacbef. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/MXUM72402289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x162ad2034e8f4dd3561832916ce8f48c1f41e1c9d607eaf8ef5d0054207b4034. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/MXUM72403042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b1a46d6ec0ee3da5e14914099be686aa833a68d38490c16f3264c6e69b51c0b. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/MXUM72403624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x162ad2034e8f4dd3561832916ce8f48c1f41e1c9d607eaf8ef5d0054207b4034. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/MXUM72403042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5e1a90c1dedb226bc0142e7dffd08a6cc9b3fea54e68905f36a46f49eaacbef. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/MXUM72402289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69e28203e36bbded5671cf95c4d67fac842f84eb0370252ca15945eb2b905b62. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/MXUM72401805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd32471fc2b6c8b1a1ffb46689d9ad289fe3896ab53a9c34ce8ce6ddd4e0e1f79. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/MXUM72401269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b1a46d6ec0ee3da5e14914099be686aa833a68d38490c16f3264c6e69b51c0b. 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/MXUM72403624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dda0e9582a7bd7193b083f546572d4759ad45430c9b9f01a203475a0aa467a8. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/MXUM72500587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41fe133db744a6c24f9a99416043e1556ed14c970df78164a4e0f95caaa27334. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/MXUM72402684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8038fc49db093ad0d2f922f332351c62c44bf656fa29385112073b6729c6b926. 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/MXUM72500592.