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 0x8ba1d0b4b8d8a9206602e8e31a60d551fc21cdfbd4e2944fc66a92c3e3df3993. Chain 2 (Bitcoin): anchored in block 953719 (2026-06-15T01:07:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8a08a11c-1637-49ca-8a57-f71ce94a9247.json and https://artists.proofprofile.net/proofs/artist/8a08a11c-1637-49ca-8a57-f71ce94a9247.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 0xad98bf851d7de3395da723e45c5ecb9872f7034b88c1c8a13207843042121db9. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/QZTPX2162035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bf14b7ab6ec69aab00fa3a4eb9c546cd7bdef746c725b5f88e5245403ae4990. 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/QZTPX2124315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4262b336790dab72b5ee09490de9e424372e10a84ba015f35dd5a24657557594. 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/QZGLM2202379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf974373acf6501201bebe9ea569095c03d9a2dd42c4cf46ff428e8483b81c8b. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QZHZ52251390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ee0a9d204caf90288e42fb892a967bf9d40f11c902ad69852823c01b4d0076. 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/QZTPX2226937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92ded26e86215845dd60c574293f535e7afffb2fbf18ca17a2443e752fe9e9a1. 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/QZW9L2246876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc65f26df8d6c4fee2c0e1503d4e37e2881951eba320d5e28246cda3d9e73a4a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNJY2312366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdab018d598f80c6485936e2b1f9f5eaa73ab0c6aa12caffa81689a7e8c7fe08e. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZTPX2364142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x022808e71bf75d3eecf2456f7b9e3ecd481e4255927818bdf2c1dc72951b4e13. 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/QZW9L2307475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02135055a917d72280cb629ce6b45cbc93eab9db29ec26c205a49f0539b258c6. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/QZW9L2321383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42b901ef0cbb8f280f1d4613614d084d9f0d22b7293e493f5b86bc226620d76a. 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/QZNJY2450002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02cd75f9009ce0c9bf71d47187ec15c8576b09f7a432281c42b3b36f26da1018. 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/QZNJY2450003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76c29d5e9b8cb7b3788211acc716bce8efe956128a0f10a4ddb4d9dc2e71391c. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZNJY2492752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x383218f9944e4a03e5b76f2e62fda8aed85d6d89bf6e3436f1d4b998386dc680. 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/QZNJZ2405729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7dc9d56c7379a32199e35845a37787b46a5a4c1695bc0a2bbb9897ad7a9f95d. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZW9L2481648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c2edf0e8d1a6d7dbc6c8d5fc422b94c7a1e296d74174e3a12550bcdacc1001a. Chain 2 (Bitcoin): anchored in block 957791 (2026-07-13T02:46:19Z), 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/QZNJW2556995.