Sylvia Sass (born 12 July 1951) is a Hungarian operatic soprano who has sung leading roles both in her native country and internationally. Life and career Born in Budapest, Sass studied at Franz Lisz
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 0x7d9bf228c94b14f25b3b889b5388eef4e1162ca68359f17c9872d609883fc3e2. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f5fa8f4f-4539-4269-b572-7b90a159e117.json and https://artists.proofprofile.net/proofs/artist/f5fa8f4f-4539-4269-b572-7b90a159e117.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Madama Butterfly / Act 2: "Un bel dì vedremo"
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 0xd4774a70133bd6ea2b49cda03f71176081cd29d511c9a1c9993f356524d2b1a9. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/GBBBA7750155.
Liszt & Bartók: Songs · Chansons · Lieder
Sass, Sylvia: Soprano Arias From Verdi and Donizetti
Sass, Sylvia: Arias - Wagner, R. / Strauss, R.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db1a18adbe680db70cbd81f79cd75a46b9260de92972c66fb93af8f75b3407f. 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/HUA251687911.
Bridge over Troubled Water (Sung in Hungarian)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ed740dec64494b92fece13cd9b12e0855a40504ffeeb060fdc400f198067cd6. 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/HUA251687913.