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 0x12a1bc3fad086faacda38370a93bf8532ce85db7ebe78fb5bab91ebbb77c3c31. 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/777d0433-d766-407b-b6cd-bc00d9f7e9b7.json and https://artists.proofprofile.net/proofs/artist/777d0433-d766-407b-b6cd-bc00d9f7e9b7.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 0x58ce91a583946617065652a15f196a3b7e1864f7318737e8c7be18310872b344. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/USCGH0901401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c993851aeaa4613c2074e59035a6ee61731d62bc8695d3378411fe5f543d03f. 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/USCGH0901406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce22c095095c9a4d80a3b49c34c7e6aa0e0379b98bbcf56a327e4add97a856c. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USCGH0901411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e8c955cc73a6df8f23d4b2de36261ecca655248c25129dea07327f25453906. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USX9P1077194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba9f9031ddac24e4977cde9e3fb4441e9ef45ffc0034b7213015a57ff86a9bfe. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USHM91296214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa12e325c83ed16e823446b229cb0e34b68551153ec52df17d09bc57cc32bda5f. 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/USHM91296215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95de0f5e8585b5ee3cfb61cd77881bb120b6803fe6cf4c5410583f30a3052e2e. 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/USHM91296216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2345a6e56770aefc8c52a8a0b2a56f18ae187be4f33ec56897670c4746db1054. 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/USHM91296219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf1d2f7813129435984bd79a76bb1d4d7bcbbf012d52007a4c6fee2946439a33. 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/USHM91296220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c2ce9f575876bdec09b2a13b485fbe7c176e08d86fd5b13fe4949c367b2800. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USDY41526638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85d36961ed371d75f8c22032efbd29797b29fd900b56de3218892067f28f6e83. 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/USDY41526639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb134d4ccba40e6d80695ff6eaa3388f0a956ed7fc0eb1df6c01215cee897c9e4. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/USDY41526640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x708d73d4f69496128bd83bf9bf5f370f5e6d609a4e4f5df89e312c168647df97. 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/USDY41526641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2572199b0308c5886473a4f72c002112d671ad18d6bb5b51e0a9f29f6aeb24a. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USDY41526645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9cc2b4b221e9ceaa6a7fc9d9175324f3d8ba76ed46c59f1d4c21a0b736fb849. 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/USDY41526647.