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 0x3dc34ec18a7fba3e7700809030973517a22c75d0726ff8b8b3acf0b3399b5c5e. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b88f1541-5790-442a-8b1e-a4f6e691a399.json and https://artists.proofprofile.net/proofs/artist/b88f1541-5790-442a-8b1e-a4f6e691a399.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
String Quintet No. 4 in G minor, K.516: 4. Adagio - Allegro
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 0x5ba61b35c01b41df81f746dd1d589b794ed4ab83d1a6475f65e137de5deab9b2. 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/GBUM70811627.
Trio for Clarinet, Viola and Piano in E flat K.498 "Kegelstatt": 1. Andante
Mozart: The Complete Piano Trios; Clarinet Trio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3742e21120c29f4f9d7ab63fdff3f284cb352c3f540669410e729bb270f469ef. 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/NLA506900030.
Trio for Clarinet, Viola and Piano in E flat K.498 "Kegelstatt": 2. Menuetto & Trio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0997544630db4916ad13edccfed042f06e5791297a355805016fffcd55ec9cc. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/NLA506900031.
Trio for Clarinet, Viola and Piano in E flat K.498 "Kegelstatt": 3. Rondeau (Allegretto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565ff4a57e73a242617ef4787d5c604f7767e8a3114db0a51d7e4a4af6a8ff43. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/NLA506900032.