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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4779d11027773860351e27aec99992e7247c28f37b3e0f141592942fe2ae49df. Chain 2 (Bitcoin): anchored in block 954569 (2026-06-20T14:36:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b2c81af4-35f8-4b6e-8f85-e8edee13b6b1.json and https://artists.proofprofile.net/proofs/artist/b2c81af4-35f8-4b6e-8f85-e8edee13b6b1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Hochrenaissance: Serie D. Italienische Gesellschaftskunst & Serie I. Das französische Chanson (Mono Version)
Hochrenaissance: Serie A. Niederländer um und nach Josquin. 9 Chansons aus den Notenbüchern der Margarete von Österreich & Serie G. Tanzmusik (Mono Version)
Das zentrale Mittelalter: Serie A. Troubadoure, Trouvere, Minnesänger - Serie B. Musik der Spielleute & Serie C. Frühe Mehrstimmigkeit bis 1300 (Mono Version)
Frührenaissance: Serie A. Der florentische Stilkreis, Madrigale und Caccien aus dem Codex Squarcialupi & Serie D. Die Niederländer bis Ockeghem (Mono Version)
Frührenaissance: Serie C. England um John Dunstable (Mono Version)
La musique espagnole à la cour d'Isabelle et Ferdinand (Mono Version)
Leonin:Organum Duplum / Perotin: Organum Quadruplum / Machaut: Messe de Nostre Dame / Dufay: 5 Sacred Songs
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7797ece22d777e050d5f7903dd60c7727ce7983e062f8ae4b626268cb36188d9. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEF055604010.
European Music in Historical Sites in Warmia and Mazury
European Music in Historical Sites in Warmia & Mazury Orneta