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 0xd364bec06b40427351277750979607c87e6e2a2a68485efb0be2497dd6538f20. 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/7c62956f-1f15-409c-a472-ca06708e1a65.json and https://artists.proofprofile.net/proofs/artist/7c62956f-1f15-409c-a472-ca06708e1a65.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 0x17250e42ad1bb625f78a675b1574ddf946183d50f7b1cb049a55bbd3b22da7da. 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/TCAFI2019569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x741aebdad2069f9a9777c8e0f0630450ad9a230e350f25be661071a166e0ebb8. 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/TCAFI2018369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x567b3eb7d89d14a455330354724dcf991a3e428fb9955ad27fa6b4879702b4a0. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/TCAFI2018378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d801d569ef4edd526c0661d38dfa1e51863eb372c5f5c4697e7c0433357375c. 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/TCAFW2158028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a7c76d3d6ceab41e0136ac354f587033dcb9d463bc654138070471eae797b08. Chain 2 (Bitcoin): anchored in block 958498 (2026-07-18T04:54:58Z), 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/TCAFW2158029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37753921bed776b07884469adbe229f3895a61eac82497367858ec036f644d11. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/TCAFW2158032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b6d8c861ff691dcdb7b352bbeb4766d50dbe169cd564de93ae9a0f61428de67. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/TCAFP2117132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00425d6f846b2388f7f4aaaedd624351a565940325d014cc353f7331e96d06a2. 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/TCAFW2158035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe125ef0897ff0b0692cb7c4ab87cd81ba48771df79f79c2cc7e829e3cea738ce. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/TCAFK2149377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13c97b07b8b1f8c186972d74451436a72d74c7f931bb0926d2d33ef8898d8985. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZNJY2316617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf401ebf5a0703988aed159544eced10b3a6880c4161b516f2ca622c3f934ba0. 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/QZNJY2316619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3246311f295a5176928aa3809ca2ae84e534993c91c94c75ba7baf592fe0dadc. 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/QZNJY2316620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x052f2cca95e3a49db0cb81b78f927c5c5e14d8719415a7e754f8ea0fa7bc5343. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZNJY2316623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76b0cca92498a525f712ec8fc11e5109b9a985bd08189d85822d656d41a26124. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZNJY2316624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x327ea691cc32ac3dc89c04a5eb1ee911b7eb0aa97d735beefb6b4ad062851003. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/QZNJY2316625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5854b0ff819394e4c972331927705d43b78dc58f94704c0aa35f313620f5c87. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/QZTVM2408769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d42d009cf07de90663cea39c6d462430d0cec8ea68d1531cb86416c19989c18. 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/QZGLM2534921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee03a2c6dde77fb25d3e56365074e1eadba82f0d5e5f4bb7597c147f665d08d6. 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/QZNJW2503163.