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 0xb1ad36f8124c32dc463970e15f1716d76addf50d79feb54a98e9d7bbb8c57c32. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6dd3fdb1-0397-4456-af90-2a08ea0ed5ce.json and https://artists.proofprofile.net/proofs/artist/6dd3fdb1-0397-4456-af90-2a08ea0ed5ce.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 0x77fd220124cdc759205babbe328c6fc7b1e5a65bc54bc227098b75d664300a67. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/PLC062410474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3f4e4380def7030f4ba2f0ccb64e380ba7970f5960c0d7a80fa10c3f01fb257. 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/PLC062410475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed53639a025a9592e80253204133090afcfb178e51e25c1345c0f66fe33726bb. 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/PLC062406065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20b198ccd1603cdab5189fe9092e8620141f3794b3b4d488841399b3adbf1d00. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/PLC062410476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdc223d107ba399311e11aba0f4f7db3a6380db636b1c37f94f9ebf92044e1ad. 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/PLC062406064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x596a2f6e538616d24c774ef849beefa94031178b52979af58dfbda343e508cbd. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/PLC062402398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4716b25a59d355c25a7e361e97960e695e781dbed5b304be0ac828bf8cc6666d. 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/PLC062410477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf009532df355f05ab95bf7dccf3886989ab3c8508b93d54267be3acedbe223cf. 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/PLC062400373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3676b2fe4ee414559e24128a6ca596cf8fe3e47191e8b71fdcec8a63f5a0485. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/PLC062410478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc71c55ef9670667074253424e50d52a09ce750b97a5a8b22153f9c2cee724f01. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/PLC062374053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd3173356df3c8d8201b33247b8b954da3f36bdd0aadafafb6cd5060ded67736. 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/PLC062404650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e4531ab0ed91080548cffb1b070c0670c52246d2739496fcffd7ae228687219. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/PLC062406069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4948b9cfe5c45b25285d02a16676a0fb92c96a97fa2e1844a8ce69e33ad679f8. 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/PLC062397888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd13382108c3aa30dd674c630a82af8619c2a8b5922ed50b1b54a78bf078afa88. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/PLC062406070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x328149daa056821b81e2ca574fac1887188068e0b17ed0e19fef5e9d250f6b1b. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/PLC062236700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6573a14475c06c84d38bdecbda1f8d454b1b0b642f24b54489541896628117c6. 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/PLC062254960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f5a193c6dd09dfbf1ebd21ce6364a2bb341569083d1aaf097487e56c7fc79c6. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/PLC062361458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf97bcdc1ff4edba7c2b94046dc8a681325f707f74c0400567e1dd9b26e8958a6. 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/PLC062410479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c779393538368f33b556e1a9a80a896dbf9f69aaca81565ffa63f9793157d4f. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/PLC062382986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb3d25bf5ab0a4447b972dcbe44d5fdeb665227e3e296706c2665c42d1bcd3c4. 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/PLC062382987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c77feb32635fe0c3003e86d7a1b32506452c6be48a273243ce6a478c11295c. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/PLC062382988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb35dc35f01a65d40a4fa5f648518df4ed6172d0511f7478175c33d08bd283fa7. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/PLC062382989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5ddd0068a3a8ba96ab42f9dfb3005a015a8a1dd194f2e8c75cb9bf421529490. 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/PLC062382990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cbdaa0095bdcf5fcf447d7171eca2b714eab4a7d29f18abdcca46154f615366. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/PLC062382991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16f47137d78a2c045ac6f988b087f1d3e9eb4b1e6b5abcc1b02681e4b29b9051. 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/PLC062382992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32e7c393ee87d8f9777344df0bed5f7a90525d1291a941a2571e0ded4001226c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/PLC062382993.