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 0x998e62585606c9d01f960deff58ddf12bf14400732645f38c4f31be7a488218d. 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/140d6f9b-540b-4aa1-88db-894c564fd7ad.json and https://artists.proofprofile.net/proofs/artist/140d6f9b-540b-4aa1-88db-894c564fd7ad.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 0x89e286252bdd113e85e48605fb5ef6c489d0b430ae71adb91848ca3af4455657. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZHZ62242580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ecbc3cc85f4cb93b95ba1b48125605af385d6b8810d40fd2e89b7345a853443. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZHZ32007632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f33869e69bb0acd56f23a7b05adb6843667c64e96ad5c169954fc56dff97d5b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZGWW2117046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde8765b5cf461ee8aa85b60259c78e0c9bb3032ef6d2e1d0b641b22dff335044. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZHZ42078656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf048230b3eadc8e54d4afcf89c56034c52374d0180f1ac0f61b98db4c29f0f3a. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZMZ92052998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x383bf9c6a713a391987ef3c607abe8d9b599244006726d89d03ac5c8391b0e00. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZNJW2162904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2908b1d90d93e53b887ee1479deb13234df795429477ccc49f36837fd2592372. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZNJW2162907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8522df451e3123092bdccbacb5d82f9368be0d1e4442b3451f7273261811574. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZNJW2162908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f14a9dd7e90776c318a3c6121cec866e5dc9f0232d88e1f3d11bbec8d37a906. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZNJW2162912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70f5d402803ac33e2333a90cc6af9d327e781d49d9157ee72b03073eb372eb18. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZNJW2162914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x839e45bf289df3b6c4dc11dac502142be543dae9c90452fa7ef822f4e3576815. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZHZ42293593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84e93d6f39a9457b035872d701535d26d38b6806342023b9ab78f723e2d956af. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZW9M2277350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a7f313ab74f14f952390a0e253d60753965ecb7e68ef7e44eb8293aaf0fac24. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZTPX2493151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7baa2465999b253c58f679f490bdf9ec4151b58d2abf14095cbf35cf4a0b582. 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/QZW9L2453987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a3f47849d7ee194a1396a931b4e7d946bdf372a05d7985b7cdc68d9b3cf7945. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/QZGLS2572560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38720e2d7ee28b8742de937dfd0f454e746cba7cc9f52f4dd5f93a787fe1cd20. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZMZ92535334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf214774d1e012b7d1962c2814c4a77f112756a258cfcfcd433755ce4ba1cb35. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/AUGBT2527465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bbeda80e61e3f8d321eb7e00fe2e26082d67baae8c3206d3bdeca0e94a13c90. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZW9M2373486.