Leila Bronia Josefowicz ( ; born October 20, 1977) is an American-Canadian classical violinist. Biography Josefowicz was born in Mississauga, Ontario, Canada. When she was a young child her family
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 0x3a97012edd643798b27495efe7cbbb713db27f523e59daa36bc09c0bf27fd155. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/80bf1762-1f68-4286-8fa9-6f65e6d7b0a7.json and https://artists.proofprofile.net/proofs/artist/80bf1762-1f68-4286-8fa9-6f65e6d7b0a7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The John Adams Edition, Vol. 2: Lollapalooza, Scheherazade. 2 & The Wound-Dresser
Violin Concerto in D Major, Op. 35: II. Canzonetta. Andante
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 0x2218eeb77ac72cbe82b79d02a8c6f2cdb04b7f2809b9bd6581a44b43ed52a0ee. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLA509413302.
Sérénade mélancolique in B flat minor, Op. 26
Prokofiev: Violin Concertos Nos.1 & 2 / Tchaikovsky: Sérénade mélancolique
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x225069dae7f0ab4bd0dfeb7f49f84264b0d301cc38c688199127990b19c865c7. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBBBB9810404.