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 0x847fd154dc2f12cac7b2b4bed15f627ecbaebdf9d434d4b663f0b2eb4eaa5cf5. 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/12e0e267-031d-4a22-b6b4-261659d8df27.json and https://artists.proofprofile.net/proofs/artist/12e0e267-031d-4a22-b6b4-261659d8df27.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 0xdbc1a749f359dfb52fc940133a70f79c75181c6ed43ddfd41c8225bd7fa27229. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/TCAFI2168659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dfbb4ce36898adf8a6fe395b393b23f198c16737fff6080d837efc7a683da73. 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/FRS182106341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa794c72b47b3e679aa57c4aa1d29873391c14b1cd67cc26808068432ffa7f29d. 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/DGA0P2316405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3acb00bb9c9c3a85270d5e36eaa9cef72a87bc035787f35b8e29ee700ace808c. 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/FRX452491379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x666b1a22500ca643d69ca1348bd4e2a78b9dda59abc68c390fd2671b9e04ff87. 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/FRX452493200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a80b0d9c7efff0517fa7e30fe881fe2ba90dc83b48a9a39343665d3709eb124. 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/DGA062465799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a9336adaea45ef7eee6c8e858b45464adc81e2ffb2b3b58bf0e04d7c49f6b2a. 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/FR59R2434024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x666b1a22500ca643d69ca1348bd4e2a78b9dda59abc68c390fd2671b9e04ff87. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/FRX452493200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3acb00bb9c9c3a85270d5e36eaa9cef72a87bc035787f35b8e29ee700ace808c. 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/FRX452491379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa794c72b47b3e679aa57c4aa1d29873391c14b1cd67cc26808068432ffa7f29d. 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/DGA0P2316405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fd06df190d229c3ab5070cd555443e751f087e80fe7e2136145a356471e81ba. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DGA062465800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f5c093e8282b62485d5bf587dd3d9d42cecf621792151138c8c13e3f8e53b25. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DGA062465801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f793ee6986a9144fca9519f0b270e4944ee777a020564a93e002213865d3ee2. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/DGA062465803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6edec41df9deea0644b89b35f848526f50b6de48add5770e8bb1c5debc0934fb. Chain 2 (Bitcoin): anchored in block 958945 (2026-07-21T00:35:28Z), 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/DGA0S2413284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50551cda41694ef3c2510c22001f7db682106ee3529ad8c19b83f60644c65c01. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/DGA0S2422695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e4c4c9a3bf9edb8b5b7ca32eb8d367fc2ffed05ebc8c7ea52aef6238cc8e1b2. 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/US38Y2570191.