thumb|right|Isaac Karabtchevsky, 2010 Isaac Karabtchevsky (born December 27, 1934, in São Paulo) is a Brazilian conductor of Russian-Jewish ancestry. He studied music and conducting in Germany, where
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 0xf513f83daeab5976d1e2e905e0178dafbf7f5bf068cc0aeb72642e58238152a9. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/56e99308-b744-4cd1-aa7f-ce2cfef8983d.json and https://artists.proofprofile.net/proofs/artist/56e99308-b744-4cd1-aa7f-ce2cfef8983d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Obras-primas da música clássica brasileira
Villa-Lobos: Cello Concertos, Nos. 1 & 2 & Fantasia for Cello & Orchestra
Cello Concerto No. 2, W516: IV. Allegro energico
Orquestra Sinfônica do Estado de São Paulo
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 0xd520a71c26bb7261b38eaf7f2dac6066499d14249275073cb6c47d3b2ef2e060. 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/HKI192317207.
Villa-Lobos: Cello Concerto No. 2: II. Molto andante cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9540d8b903d0eb858d1458faf4817b7235cfd24308814fbe9736305a732c6cd3. 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/BRDEP1700086.
The Essential São Paulo Symphony Orchestra
A Petrobras Sinfônica e Isaac Karabtchevsky - Uma Coletânea
Villa-Lobos: Symphony No. 12, Uirapuru & Mandu-Çarará
Villa-Lobos: Symphony No. 10, "Ameríndia"
Villa-Lobos: Symphonies Nos. 3, "War" & 4, "Victory"
Rachmaninov : Concerto pour piano N3 - Piano Concerto No. 3