alt=|thumb|Sunday, May 27, 2018, at the Esperanza Iris City Theater. Katalin Károlyi is a Hungarian mezzo-soprano, noted for singing in Baroque opera, particularly those directed by William Christie.
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 0xc89d38a85b6ed0288e911ae91b4b2fdad91e33ac4734f3115ab722dfc00ad6fb. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8bbe13ab-25af-473b-9f3d-e4e6d8928542.json and https://artists.proofprofile.net/proofs/artist/8bbe13ab-25af-473b-9f3d-e4e6d8928542.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Gerald Barry: The Importance of Being Earnest (Live)
Hungarian Songs: Bartók, Kodály & Ligeti
Nyolc magyar népdal BB 47, 8 Hungarian Folk Songs: II. Istenem, istenem
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 0x3b41e081c35cceeeb4c2556e39abaf89e74fe2426a2b9270d615b6e6134ba34b. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/NLY332301196.
Nyolc magyar népdal BB 47, 8 Hungarian Folk Songs: III. Asszonyok, asszonyok
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x829f3d71f2d89a6b2451c92dd038a11a33a36be53355b5ce4e24af9bc4235ad9. 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/NLY332301197.
Nyolc magyar népdal BB 47, 8 Hungarian Folk Songs: IV. Annyi bánat az szűvemen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc950d6bdf440d205e912e2fd849cb22c5923e8ea8c1122d7530b77df2482e38d. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLY332301198.
Cage: Works for Percussion, Vol. 2 (1941-1950)
Boulez: Le marteau sans maître, Éclat & Dialogue de l'ombre double
Euridice: Prologue: Io, che d'alti sospir vaga e di pianti (La Tragedia)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ebba14bf16150027e5443fffca21e1229510a4605cfda095459f3c001dc8aa2. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/FRW030810168.
Euridice, Act I: Scene 2: Nel pur ardor de la più bella stella (Tirsi)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ffb167e78e49df0977229a847c378c2d8f2a7c4532ae0123a42694cf9435759. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/FRW030810174.
Euridice, Act I: Scene 2: Per quel vago boschetto (Dafne)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f5706a345e52d2e4397f423ecb1837e525b96964edc7e656a8185d089caec8b. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FRW030810176.
Gerald Barry: The Importance of Being Earnest (Live at the Barbican Hall, London, 4/26/2012)