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 0x83626b9e5c5d293a22300f636df3ee60b7f57e08261aa273f4e1367563ceb629. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/24ad5025-4d42-4482-a7a4-d0ece1b12196.json and https://artists.proofprofile.net/proofs/artist/24ad5025-4d42-4482-a7a4-d0ece1b12196.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 0x856589c28509445f40485bfd6faef536cf21c2630996d9ab7ae7ea8c939901c1. 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/QZWV32483715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04e22479ee11f62a94e0d10a985df8e6c9a1ae549e9f1b9ece73eecc451401fe. 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/CAGOO2465340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8f5eb9182f388b78b6bebf1411974e4582858fac19f1d3acd2880bb7901d1a8. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/CAGOO2465341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ef98de350993f875dc2e0143bb662fb1e69198050e21a857c3463e666ffb0df. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/CAGOO2418616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdfb71083c3a0566348d8e55cba10cbc16c797faa559e6790fe0511f11fdfd7a. 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/CAENV2452728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd79b81b6295b0e210919378a52d0237cea6959f8a372bd8e86a18051b7f5aa75. 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/QZTV32446969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e3e39950ff5dd1a6b879f57c6bcd3f78e83bfa43becec9b0874713610543bb0. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/GBRKQ2484168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x620ac23ef69a66124bcca429b244abc76f3efd75b0ea463db052b3620fd15413. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZNWT2361583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3ad3d1ac4dda8801c5ea7cc62f7ddfc41d66ca27c39019b3bc823ec29e5ff2e. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZMEM2349107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bea3f504dbfdfbdc340f33efb0583d76b061bd6e63662732817df1f6219c8b8. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZK6J2372018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8b30e2845fa1a8b9ab613a3273a08be040bfb1b3f00f01c32ca2d276aa8b31e. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/QZFZ72320313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb14c8c79f68c8d979a55c505913a774a2751c3b0eeb26efa2db102b558c0e449. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/QZFZ42356243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0152d7aabc0a7189dcab2be642675110eab113fdf0dadad339021a03327c4e77. 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/QZRP52218655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd5386c8bf9abb64dbf1d04e92433df6b0be674c7e9ec8b26557d71fabd63143. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZTAX2401572.