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 0xa22c36ae217d97189849a925176e1dea324cdbddd6764e7dc0b582e99b88d1f9. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9b1f49fd-e1fa-4baa-815c-24e420cb551f.json and https://artists.proofprofile.net/proofs/artist/9b1f49fd-e1fa-4baa-815c-24e420cb551f.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 0x4f523f013fed3b8413ddd82fcb44c63e670b332d5299860a4e8a0bc6f8d5b310. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/DEU601807991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04d447a1eb98f882ee18fc7f7c8f67870ffe678f20c4beeaff9d1c334cbaf9b3. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:50:34Z), 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/DEU601807992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7f1004c91ce4f9805883cd5b1eecd06b4174172a9c1f0fd3e2e9a8481e5d390. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/DEU601807994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2cec0f67b0791f2e9a40f7333ea96b0f6736ab2ecfde8789486426859e2c096. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/DEU601807995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x426f7005c1ffee19c7775652c8c722fb3686adccd70b28a8cf108d973df04818. 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/DEU601807997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b0f32378b85667b0e51152b4683f873a9a52234ad64dba83b65d8cf68957b09. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ATN262208402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b53cd5a869935142c99661a3e5f5b0c59900cf66b22996444435d6af68160bf. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/ATN262325204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88e775995d23b392d5957f0206629c841df87abd1f1c985d913a2c155c36d7ee. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/ATN262325205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe838bcba0ace6606a2758c7f64fb529d6f1cbfbfa2fd42be82a99ff0551c2bb8. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/ATN262325206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x409a141206f339d3d5039615811dbcdb6140d316234f2b6a9ac8abe65982a2ac. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/ATN262325207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd530ad06c1e3b7aa8268a5bbe851c7750bc31ead1b8f8fcb11eb570afe355213. 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/ATN262325208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05dd282ddad0043ae60e68c148a803e916d4536de8f0d3b1b4af393f59a6f2e5. 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/ATN262325210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69a601c60de4a5576eeabdf63015d35999b9bc3257c8cfdad70a9a529f03de31. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/ATN262325202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72a07d4a8b6c5b7ee2404955c3f36d2927f433b29934bd479da99f6dd10fda19. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/ATN262325201.