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 0xdb2ebd09ff4f785eeac4101202bc2381140696fbb4987ba437ec040bc83c88df. 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/fc22a939-6bf7-4324-a7a8-3ebbad74fcf3.json and https://artists.proofprofile.net/proofs/artist/fc22a939-6bf7-4324-a7a8-3ebbad74fcf3.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 0xa7d24783d36470610c50c06fdd72e392666ba1dae1a39a2ee092fd1e30fdeaa7. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/LBA132001019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6b144aab40b91453896bc0207edaf3b9cdbe853f864906957c03429f2040ce5. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/LBA132001021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x567e667b1062767905b0daf206b8079e698a82bac44d92930c07a025ecbebb09. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/LBA132001022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ea76874dadfa061d243f864b5ae9ac7e7f828af8b6dc2af605c6375ae7d1e4c. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/LBA132001023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4312c2b5b2ec76c753dbb8e434af786b70066b8f2dce2432e52a9f57f785040. 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/LBA132001024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33d2fdd3ddfadc9bb60d3ef2bdb74f46d713a83dcee12418edcb075ce7b7de12. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/LBA132001025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4389271dec1fb27383d985ea46de0f57548d97327f243b339bb30f0f2c36d633. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/LBA132001026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe5c6658355240949e0473a13a7330dfd0d901364e2413de5068d395edbbf301. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/LBA132001027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bdb0f19fdd4b3c2d9cc374e1e7150d6246eeef495a9311d6e8701cc6f3ffda7. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/LBA132001028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd470c02d9443afa19656ba7d63019cdc0c935af130e6f961c8a5880387aba84d. 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/LBA132100846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd41e08e95b82f50ce39c854e0b69ea1ede884d77c15a8cc508230c889b9ca475. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/LBA132101097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c71f2bd9f3e3fb3d8a0c8d1a29deda7c9aea3ac23fae0477629e0fe23b6dca4. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/LBA132200312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ad843aca48821a5aac28ee2f01aa0070da01955e133dc47784fdb3cae4bf751. 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/LBA132200575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3f30333164d911b564d7a75d49d394399161f3b9cbbf5da43853a2a336b365b. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/LBA132300055.