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 0xff7c8ead65306fae676b723c928f3fe8b285bc24b15cccf14b2599ba3120d6e3. 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/e1a7b9ab-1214-49e6-84ea-e7e5bc739755.json and https://artists.proofprofile.net/proofs/artist/e1a7b9ab-1214-49e6-84ea-e7e5bc739755.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 0x8fa3c006b67bf1df1db06cf89bd8de8953d0d4446edcbbaa00f08c510a43fe98. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QMFMF2120048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x156ee3ed20b3829ffbeded6960a84f73dec965af5f419f5bf06f8c405c3b4265. 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/QM6MZ2146187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe75101a2fde931aaed97f79c8dca115ecbbf881fa74e9f59818946e61d17bbe7. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QMDA62134555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4243dc244c816b8bf37d9f03f0303235496901a95d01bd4c9870b30d8016373c. 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/QMFME2209019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x971e26efcb3b8fad57212ed75cde79aad0b2eaf3ade7b5f84bf5231f9b9610f1. 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/QMFME2209024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6acf3284fa446ab6e072019924b48a17ea1a8b1e87f6fd163763ed9c44d3a06c. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/QZWV32483504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf725312cc10a4174bc858dc8de73ba8509f3cc41693e3765f87c078e239994a2. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZWV32517751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44f484ddf244ab3e93e2ccb5172b797ff248bb2869c6781dbae60ba6dc128714. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZWV32528691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9e8e45cf19c3610054ed7681a2bfd6374db414c35f12dd72191c400a4ba8f52. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QZWDD2545482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf725312cc10a4174bc858dc8de73ba8509f3cc41693e3765f87c078e239994a2. 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/QZWV32517751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c5f93647f3f5c575832b7d03c872265663320a81e7cba8f96bf2743e4624528. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZ5FN2535190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc452e82b9125619f35846c9c94255b25fa6082f208ed82211ba1c39f002f6aef. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZWV32528756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x488cda16445e4fcac79ff486a85ed132f601ed4ccae75cc415ce4d692d48a3aa. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZWV32395082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa0f7e6b2410a0348a65b75dca4e9e5b2f10d06d2dc4623293139b1c99827bd. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZWV32528811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c19dba1e9c8fd99e5d0aa272cf6506cbb1bad651a7f9b9c23fe41f9616c9fc. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZTRX2334063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6d3a7c9f980c466f1bbcb6f58c3f435271a4b5a06cfb744549a8f174a85e269. 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/QZTRX2458686.