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 0x3b3b989b3a6eae086d15a8e6e4046ad89b7e889be39f9fb20af790ed56030eaf. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a9294f26-2fa1-4230-bba2-a9f9f11f44c1.json and https://artists.proofprofile.net/proofs/artist/a9294f26-2fa1-4230-bba2-a9f9f11f44c1.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 0xedfcde199b17df5d6f4f777259673f68a2fd38b20f738b474d37a406abde019a. 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/USCGH2518911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80030c99050368c13a2b798cf09ddd7c25e2c04efb8e8791601b127d28ffc849. 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/USCGH2518912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83b7d72c92047fe9c110edf5bad483dadb1b04365d0a31c1778cb103ec3560c9. 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/USCGH2518913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16d0da52075cdfa5432fa91e9a909b4e5b081f2085ea84f6885a1368314ea656. 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/USCGH2518914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c9805d9b00a115489126989c09bb428e6413b44e26b768fef5079f7e62a50fd. 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/USCGH2518915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e1bb32116cf56168b756085cfa889b3974d40d6fff46c71b65d51f80964abdf. 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/USCGH2518916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d20ca837bb46c3e6082a3a7fcdd19931abba953d9e28bd35f4f5d23c01d4165. 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/USCGH2518917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcce1a1e8d221e1cbbe0fbdabd6aa990f85ad8b8042d19c4d92ad91ad22b666c. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/USCGH1917842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd101c788128db95550bd9422534fe8112c5668e1a0ee784e9ca1ccc5674aacf6. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/USCGH1917843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x094b2224eeb9f4f95e9107067aed3c7d8341cc564c8c120f3b3101346fd35d5a. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/USCGH1917844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57a13ab2fc30ff6bfd596f73f8f2f982435c33417c36455598b12e00ae550fc5. 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/USCGH1917845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c391aaaa1b203ebe6ce34ff896fec73d367a9e154570356f644a68724e18a9c. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/USCGH1917846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x353cfee325e8e85de54aea7b5b8ede93ecdcc76be00dad4e222df0fecd6fb31d. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USCGH1917847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4ac07c9df4e4b622f56a8c3a30d7c3c153f7696cc85a50b4324fdafbd2c143b. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/USCGH1917848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd3068ef99af9a3dfcf56bcf0a438daf8e81c035c06db342957fc19895635797. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/USCGH1917849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a3d18e23de3c121f9d28c5c981b7ddf792f4d13ba9e8f629934fa1a27b62fba. 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/USDY41550711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa662f587ebad3e39873b8d62b49d73e28dc6a3f022fcb51c1210ad41aeeb4f7. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USDY41550712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc0399bcdb49ceb47476ed8aad166c3252a40a301103d8573daec7feec683ee9. 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/USDY41550713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4066e6ebad36f91a769fe8272462ae91e3406f3d252d206556d6f89b07ff142d. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USDY41550714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc01f3e7be1ac2d163045eedf850ba15a3e7e97e54377bb2426f3d3d0e6c86887. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USDY41550715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff6bccf2711ad5bf1002db5269e4737e56010268edcbd23ed3fa488f49314664. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/USDY41550716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x096c9fd564ae0dcc67a85cba1fb44f47c8d64fd3861a8d29bbf9f77cfe0bb41f. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZHN92462402.