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 0x8ca767bfe26263fa2a4327b428fc05a4afc07e776b90f9d2e6a81364f50473b3. 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/e86c7311-18d1-426b-887b-ac08f558e7c4.json and https://artists.proofprofile.net/proofs/artist/e86c7311-18d1-426b-887b-ac08f558e7c4.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 0x819c3de58d0155e4f543ab84b03c940c2a016d0dd58188243a11b6e73913edef. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/USHM21707069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cfc6e7a9232a75bfe2075a798428a2c7bd6661263de9ff1221c325b60ada251. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/USHM21799824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe426b98a8a4af2c4a72ebc82c24b235eb1ccb204e5bb95daf856c4ca4712a130. 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/USHM91707469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a529fe3e99297e54819647dc6c694ec53815592d523745ee38629c566eb5f94. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/USHM91707470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98da6bfd49ecca92f09c9b3b86e0c935bf6cdfe0f4b9596630e86a9c36a25bf2. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USHM91707471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46f3d12caa9d02d9eb3f9403519e1c19dcb3055afe7d0d2d46c396d95c9d46fc. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USHM91707472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11bf660a5e691a113366a6efb9d3ef98b2c08638dc3b64212ad1a53afbc3a9d7. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/USHM91707474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd75c841fb6a007f402a3424a76a10ce6d92dd96583919496fbc6ee56a48d5d9. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/USHM91707475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5dcd5808d16ac464f4093a3bcbf265182c85bc87bd6e654da050363ca95afcc. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/USHM91707477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda3e8b4c2aa008d5165fb265b513a70698bb92bec85d5b87f062787ad52a445. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/USHM22118579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x975cb3c877ada2c9fe73eff54907e0ff8d65323a67bf2128be9eb8972848fedc. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/USHM22184342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b11d936acc6833d6040c859ae311a5dcb3c1473c0f407aba3418a08b41c6bc. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/USCGJ2243406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c792a6c035ad0866dbaf8dacb61a358542e9460498f933f0f0881601707523a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USHM92412399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f4d340eb902fd82b46673a5191199cbaca34a99954a73b0f032389051f7dd96. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/USHM92412677.