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 0x8bdc01b79cb7ecfa95eaa898e83c66bbf195d462ab65ca82302c6cbf81167c73. Chain 2 (Bitcoin): anchored in block 953724 (2026-06-15T01:43:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8cf8a155-e0a4-4128-bb57-6f6a8cefa8c3.json and https://artists.proofprofile.net/proofs/artist/8cf8a155-e0a4-4128-bb57-6f6a8cefa8c3.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 0x11adee08b9c5401ee04ddd33b75d238e3ce6aaefccd6b3176b9ce264b794ff14. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZTAX2384441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe451fa30c64c75af034dbc01b7cb87363de5c54e4094c9169ab71ac769ecb70d. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZTBC2329100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f714dd0aff246d3255c127e155f19bd32a206c111cfb459eb2b819ba9ec0fcc. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZWFN2331591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f714dd0aff246d3255c127e155f19bd32a206c111cfb459eb2b819ba9ec0fcc. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZWFN2331591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ab88b8509f6a00f6a5ed434ed184665900f0746fd4c923934035f11e010e07b. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZK6N2497557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ab88b8509f6a00f6a5ed434ed184665900f0746fd4c923934035f11e010e07b. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZK6N2497557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf31d9ce915baad50938da044bda5fa2628b8a6dbe1b36ca72091ecc3810a19a5. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/QZWFL2495838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf072b41c49f6094ca3d569479502d8bf472792c20cb78254cc3538066cba7f64. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZZ7Q2460527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf072b41c49f6094ca3d569479502d8bf472792c20cb78254cc3538066cba7f64. 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/QZZ7Q2460527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83776bf52a6d5fc8a7072c12fb164c2a1306644ca2c89f42c33e45ea1feb5e37. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZDA52534036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13488f9da82fd6a5fac1936b8b573bc2805597710d75b9093c9d9c4dc69262c0. 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/QZK6P2524719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x478a3ac8129e2355f9b20a8c2791d512363a63a57f1a43fad78551cdbfa6a86b. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/CAGOO2514426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fc08b0114c9d742298a7f161cb848bcbaa0a1beab482da663006ebc82a1bc87. Chain 2 (Bitcoin): anchored in block 958827 (2026-07-20T05:07:11Z), 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/QZNJY2513069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a1ef9e225909e56d175fd3877103cbf0af1acac6b9530d470b20a0f04346107. 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/QZTPX2504266.