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 0xceffb9e0465a89b2906e747a466a031aba3dccec58c95ff4c62763b75e4c2b40. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c81dea07-eb38-4dc2-96d0-5b9a32ded9d0.json and https://artists.proofprofile.net/proofs/artist/c81dea07-eb38-4dc2-96d0-5b9a32ded9d0.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 0x1f97e8bbfdd12c2ba536fb94b729a32d1f963c01615f313dfa9143c59b3f6070. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/NOCEM0202010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fbc1fe758e46eacb993d4cb67b433695b96cc5cd6d9521cbf3d871fd06e3b0a. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/NOGTA0584020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe25df91a7d882c2deb26502e81776daa96ec6725bdc4566d207b61696a33ef55. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/NOGTA0584050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x295977384c2f7589bf33f2a7e5e6407ca92920f93b8bedd570fc8d646e9246de. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/NOGTA0584080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d82594095318b0d6cade26218e50dbedee775dad14fc2f0d769ef8adeaffdf5. 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/NOGTA0584090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fb63648a1ac8fc050ca80ae3e91a38e8337e3927dc4b7ec3d29276adcb48758. 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/NOGTA0584100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f432d300870d4a1debdfb2cbad4d58bf862a124b7454329b45d7fab1e80672d. 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/NOGTA0584110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5653f1587bc84bfb08fe9bfd62e05bf7901084bc9e81b5805ad3df7f4faa38f7. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/NOGTA0615070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9970bd29826432a69a2e58abda09c1aa8da5506dc7d874cd072fcea1e4328095. 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/NOGTA0615110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b17375a9fc63d00c6a3c59743a33acefba0c12b377caf98aa81f0913ffa505b. 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/NOGTA0810030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c116e04f9651dd3121ccca87cf142a138058cb758e20bb1193e4ac82706b68. 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/NOGTA0810080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aeb1c52873c25e7af5a022920bda97078b7132a40934c4023e2632e59f45695. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/NO2W91801050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x475ee80f81b59ad75c7a622533b0b4b1778319434fff28c4def9207fdcdda0c7. Chain 2 (Bitcoin): anchored in block 957647 (2026-07-12T03:57:41Z), 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/NO2W91801070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf6e426258d4008fc6bb406980e7ae8e52ddd1416cadf6961ab19c725a9a7d98. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/NOGTA0615060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fed318c28d20fd4b7351012c4622a2e362cf1f35ef9c3a6997e5ff8b085ac41. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NOGTA0598060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5888950e44d82111d0c25aba59a99c0ce1bab3b077ccf1b2784e7f451065fc6. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/NOX9X3725210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc5938965226e52bfa56ca7ef8d5b4852fef8c1b1d9683f64bbfee874f0fc47. 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/NOGTA1077120.