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 0x85e58c66c16dfd443dbe40febdfe0d5303ec1a11d2aa6e7bcb19789456306a0f. 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/0120e6fc-3e4b-4536-ab48-b78a093cf441.json and https://artists.proofprofile.net/proofs/artist/0120e6fc-3e4b-4536-ab48-b78a093cf441.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 0x7b6b9f1ccced713ca91a0248ca3098faf800db1fe06848c0408ac309660518a4. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZTPX2393889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab42b9b64b86127c0b3b8c482bb435bc62d193490452c3fb6a39f5bfcc3fcdde. 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/QZTPX2388030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddd407cb2f9aed7c93cc5fcce5d5add7066002c62ef5a0bf2ba5c920607a5ef5. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/QZGLM2407419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe59178048b1e1077e6a36a48e047151825bd76aa4972f06cd18271c3276b7fa3. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZMZ92493272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33a98c00daa71c9f3a3d67b0c735f3685a807966b4e8653ad1abe041fe4ed8db. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZNJX2406616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f8f0229a96490ad2cce87101fe0ce6a313e21cdd210097e62ec22ef7d92da73. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZNJX2421818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2beea9490317e010fafeba8463cafd288a882134c87c5ef3718c511ff2b478f. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZNJX2421723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3356d4639c6aa0aa2d07c5ec4e52a59210c689c7943e84554757bc9c9ad2815. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZNJX2421720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaeb6a085692c8891c61094b55b39206582c98c7f739728890f3f59703228121. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QZTPX2426874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7bcf4a34272b168b0f8539b94a46e77e56a23646b616173eb1fdd3692e830dd. 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/QZNJZ2493242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9797d9e359ef9bea75bbbca991a4575d6c98a3dfc05eafe5ffa81e34716b5ebf. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZTPX2446103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15fd5720ae3befe80ae5a288697ea1beea30319b285d2fc2ff5a9bc9da4bac4b. 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/QZW9M2434159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55d38aafdf4a54e083cb1db25113602bc560f12f3bba25ed37e4bf4cdc561b8c. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/QZW9M2434160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cb2f893cf983d7480fee2ce8e0784b9bf6acc47edfd5bb2388c033804c84d55. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZGLM2506439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb565b6eae9a8fe7a5cf2f1a193eb17e0fcd3fe6057368eb16bafb630e538a0ae. 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/US7VG2592505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c4ec8773a830034f65a467312f489a103075c14c48f3a7c3e5ba339bcbfff3. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZGLS2507775.