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 0x4afc37ef37f1fbc184d0ac68fa5d8c4d122ecf47c715873ac78d03507898ae6c. 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/a0746d29-3102-47c2-87e9-665fd4d7782c.json and https://artists.proofprofile.net/proofs/artist/a0746d29-3102-47c2-87e9-665fd4d7782c.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 0xeee72e1e99aac275a097a42ff7bb8c24be5d3bd43519723627905424573c58f4. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PLC062241163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80f493f11117618e357934f58d866af6fa816fe0167fa33fa7a90925507cac32. 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/PLC062243870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d6d706417d8c28d01a8b2d1d412e7d3040d3a466afe80461bb65dc3271563a4. 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/PLC062246764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x190d4393e931994cc1106c6ee1ff8f33b1ccf1c71e49440cc8158137af7d7e18. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/PLI365415780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4393b8ff9f2e2ddaa0fe2b7abf57978e9ab961c841e5e83f31adfbe14823658. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T22:38:12Z), 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/PLI364577440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95a37be73387596cebf1fd4c973dbcdb78f907df1d943cf60e52a6166f400335. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T18:31:00Z), 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/PLC062529880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65bad76f023736e21850f32669ecdb51c44090896958776d7bd043b46771cf05. 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/PLC062533192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b5aad66cc8bfdd579112be6b432b9e72a67c31b933011a3fafb896e0118199. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLC062239686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b5aad66cc8bfdd579112be6b432b9e72a67c31b933011a3fafb896e0118199. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PLC062239686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87ae8a6f6a90ada14c4b589492d73f413643fe9a4804bce5ffab00729671f7cc. 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/PL89B2200057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d9dd4bb873b158eda2b9def3a01173f2c0c0802b4cce17508bd89ff4196b67. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLC062429537.