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 0x0d5cc37822ce2427414b24db40e69344a3dfe596a5afc96a32e44d937b6d3948. 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/3c11fdb4-14c5-474a-bd6c-8c0147569549.json and https://artists.proofprofile.net/proofs/artist/3c11fdb4-14c5-474a-bd6c-8c0147569549.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 0xb8204fed5509209662fc7737f3021611e355e4ef86014cc6e0819d57ce2b087c. 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/HUB001200019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8120b9839b36fcd64741df0e3c00952fd87a25f9c2c3f639240e0b92be46217e. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/HUB001200020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c02dd714a43897a5e5d162164d8bdf4d47c379da022090c3a95eff3e085dc5. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/HUB001200022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66122ef80bacb172f680cc01df293aec6698e89a4db32efd9689b0bb5a4de525. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/HUB001200025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x073f7b341cf72a04e038767f5f7a7540a409f0a7864a41909be6a599ae42716c. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/HUB001200027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8430be59aa08150086954580df48985bb284bee82a11c671551a3ba3ba43f6b0. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/HUB001300016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dec01526e9975422758dfd6c8977b5ef97211f362eeb0e58f2d85524d2be79c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/HUB001300017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67591a476007915a89723b39d82243940c4bbee2e055f222fcc02ee849ab7caa. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/HUB001300018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd47d3466fadd452ea54bdcfb84c21be08c98abaf2c0b4b143fed77504dd9b8e2. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/HUB001300021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41b4f9e5ddcbad6c36386b88b35863d1992b2b9bc697d4856f5558d3b99c32ef. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T02:02:39Z), 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/HUB001300024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6578dd23f1e36f95fbf7207f6d9feed7b27e052c2a1afebcb07d89842ec1d82. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/HUB001600018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x915c674b274dfa317aecffdea6fe627dc1b22aa049bb4c6baf2c1c227abe538d. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/HUB001600019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e3d3b45eff291946096ac550c59544f41b81bc396bf4ac6a8844bac000f7016. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/HUB001600021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e5016c339a4ed58e962fb870465a711a43f6f16264b9d148a32583f8a76880c. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/HUB001600022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19386d1f1ebd4be3106864d6aa6b13fcf1ed985c5f95af61be2ea2976d747075. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/HUB001600025.