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 0xcbb9801ce099afb7cb88a56cad4eaf28648ae0915b835c422f6e438608b37aaf. 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/3c6c6fe7-41b1-4359-9471-6ee7679d8135.json and https://artists.proofprofile.net/proofs/artist/3c6c6fe7-41b1-4359-9471-6ee7679d8135.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 0xa8573420ebf33d178f72667fa1a9d074038fc6db1bf4726b28c8673dd5dc9429. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/BRMKP2201023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a44f9e8e5f81ad00896fd8e55865090d2ffb1c0594ca8f19740e1ceb6a3d521. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/BRMKP2201024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8078b2e28565a56f942112d9b0150bd26b92d45447b6aadc3621bbdaaa974a77. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/BRMKP2201026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1d34bf77993a65d999577bbc26ac5a6f09fa88f60f04cc94f6d61ab10b46f62. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/BRMKP2300469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0461c3e28940ae02ee56739fb390a55fadc29af76b7ee58953aaaf6fa7fc3ba1. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/BRMKP2300464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x855212a8a76bc3bb76ef4a1e74675d808548b093ed97445bf92f0c82aa04a327. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BRMKP2300468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a45e066f6f062c5c3e10994b482e9f06ed59f0f6a92dba4517c96c28d108f85. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/BRMKP2300467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7129b8336e2f9a76d8a7758688be397326b509ccb71ec828f36d04c9343d6878. Chain 2 (Bitcoin): anchored in block 958724 (2026-07-19T11:19:01Z), 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/BRMKP2300465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1d34bf77993a65d999577bbc26ac5a6f09fa88f60f04cc94f6d61ab10b46f62. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/BRMKP2300469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e4a5d0df817c2808172bef494ce0831816ab22df25015e9bf5dff94e1ada7a6. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/BRMKP2300466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x855212a8a76bc3bb76ef4a1e74675d808548b093ed97445bf92f0c82aa04a327. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/BRMKP2300468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3cedc6981934e019881bfa0aa28d75d8549f881c079bbe3a2001e589e370a73. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/BRMKP2300471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9e24abb01ea76b9a30b27f0cda319951c1b4efae1a600dde86b9aea3b824cd0. 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/BX44O2500588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x619ea0bb08cdc09dc424417771fd96127b395e43d4934be6f0a5bca75dad57dd. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/BX44O2500585.