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 0x109ef41b386639c2b30c8c9dd81e62f0d643ffa29ca96dfcd95248d72f952826. 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/d4fbff1e-9982-45c7-a7b2-d9155de2cae8.json and https://artists.proofprofile.net/proofs/artist/d4fbff1e-9982-45c7-a7b2-d9155de2cae8.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 0xaec63b511b7f69a23832587709a184915da7c3fdbc906705018a03fb4208bca4. 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/USA2P2117862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa352cb9df229248be45737bbe64e19629a6b79d26de0dfa46de2a24d7813e7d1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2045029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa60a057f0f8efcac4ef06ae53e5929794ebaa1c2c50b2e32a586c4e127f2e5a3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2036614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6853c0aca40a04ad0a35a44ae361ea5ed059c8d696a09f0ef4028dc0fbffc626. 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/USA2P2400239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fd17f4f5649cb1e19fe0a9159f59b58510bee52f890b5532387b44aed94aeeb. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2422200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x106ca9c65fa7c489c349571854d925b0c6a38fbf43df9feca6e7bef662d8ebf6. 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/USA2P2400236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6853c0aca40a04ad0a35a44ae361ea5ed059c8d696a09f0ef4028dc0fbffc626. 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/USA2P2400239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x106ca9c65fa7c489c349571854d925b0c6a38fbf43df9feca6e7bef662d8ebf6. 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/USA2P2400236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d44db69a0d2704a9c9c1d85c34226345e4691c15f1b6aac5bb281b57b70c76. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USA2P2331147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70cf706b98a9f9dab5d102dcb15a3c65c609f3dff7005cd50f605b32344b28b7. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/USA2P2231141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x900775f7bf4f63ca5738e1d5172c7e2419d0dfad439d59f8fdbe311e06086e40. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USA2P2226403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe05b520cfd6ee988f1b306568c8f912e1b9fc75441265f25ffe901f27915bed8. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2132032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5c02d535f77fa9fb46c3fdc362f63e50f1a2c46529e4f6ce99887d6f11bb780. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2120238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8ab93ee9b487d57e94966dfbd3a2ea68cbc5edc86371726ca098401f9d06638. 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/USA2P2104243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09508731470b6a73eb20e85d982340a99f73993254a735a197c7fc8436a27cef. 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/NLF712010962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3111607492ad077027f454ed6d8178070a0760432634647b0b27dbc425a79331. 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/NOEPO2000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72eea16cdf97d6fa0baa96126ed2ae7747de54d1a8c0bb9ff97edc964f5f5d6c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DK4YA1806001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2c3dc957d586cae330b1056f4f819dd83b58a4e1c3a4616cbde1be819592fff. 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/DK4YA1706801.