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
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: I. Allegro non troppo
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d5b233c71102a427e381d57f5091d36fdddeb3a5618381360475dde9f0d8e34. 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/HKI192317204.
Cello Concerto No. 2, W516: IV. Allegro energico
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.
Cello Concerto No. 1, Op. 50, W095: I. Allegro con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f6c49fedeb281f45dcda4cb530747b2ae47f02659e5f5152c5339f21e7d2c15. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/HKI192317201.
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
Cello Concerto No. 1, Op. 50, W095: II. Tempo de gavotte. Assai moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x251a209119c011255c7630c68da02e3af1977391f30a77ec540eb50c3f325974. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/HKI192317202.
Cello Concerto No. 1, Op. 50, W095: III. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7334dd586ffa68493a4e64644a5df0251ac90b4b72ecd7ee8ef5eb17f93c0bbc. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/HKI192317203.
Cello Concerto No. 2, W516: II. Molto andante cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39f6626417b368f378a165a16f64d4717aff0f227b9ca78a3da101314cf7fdee. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/HKI192317205.
Cello Concerto No. 2, W516: III. Scherzo. Vivace - Cadenza
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50136abb8b331f1e33fdfee7c606123bc8059b29d3ff954f4a2e8c70bb7afbd1. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/HKI192317206.
Fantasia for Cello & Orchestra, W454: I. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x268a818d94ef586e5f4738ba83cfba2000cdfbc9948bb5a4f2079e831cdf7793. 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/HKI192317208.
Fantasia for Cello & Orchestra, W454: II. Molto vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6634bf79a71a74d82d2f7871c9a67352c2454c453ba54dd6b22293b867a3002a. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/HKI192317209.
Fantasia for Cello & Orchestra, W454: III. Allegro expressivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57d8534ae2418f21b9a9a61ffc793de61d67cd51666217e68c112b4571c348f7. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/HKI192317210.
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 956312 (2026-07-02T05:09:12Z), 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.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91f11ee3054799188ee46833a0afc2ce6f08913dbf7325d55c45c09fecfdc693. 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/BRDEP1700089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2513eeba81a749e9179c192008c8c56b68054157c18ab65020f5e83020dc6c. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BRDEP1700087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23661f350a2115838dbf07acc244162b89ee06cb3d9c722c68951ee20278bf54. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/BRDEP1700088.
The Essential São Paulo Symphony Orchestra
A Petrobras Sinfônica e Isaac Karabtchevsky - Uma Coletânea
Symphony No. 8: III. Allegretto scherzando
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb061b21dd59e189aa7a335566789c166420c4bbf744bbdafab284be9f6afe378. 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/HKI191626903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77be9f4823f1a15f2f4d15fcab33036a76732fd4b5857d98a38e29249d993bf1. 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/HKI191626906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17f44f23dcacf9bb79a7fb9c35f4b950c2aab910228fa932487cf82dd2fb1d1b. 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/HKI191626901.
Villa-Lobos: Symphony No. 12, Uirapuru & Mandu-Çarará
Villa-Lobos: Symphony No. 10, "Ameríndia"
Symphony No. 10, W511 "Ameríndia": Part I: The Earth and Its Creatures
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6fa197741de733a5f2d4913a72f3bcd621ba706f0138e05fb77fbee9476b09. 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/HKI191409501.
Symphony No. 10, W511 "Ameríndia": Part II: War Cry (Bass, The Voice of the Earth)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ca4d98d3834387f96f067d9f743dbf193f4bd94b2ca113e1b1e126f3e781de0. Chain 2 (Bitcoin): anchored in block 960384 (2026-07-31T09:54:03Z), 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/HKI191409502.
Symphony No. 10, W511 "Ameríndia": Part III: Iurupichuna (Indian Natives, The Voice of the Earth)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97510e123f3473eef3977b8dd7fe1040e5823470b1c32bfa45ecd722d683c34f. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/HKI191409503.
Symphony No. 10, W511 "Ameríndia": Part IV: The Voice of the Earth and the Appearance of Father Anchieta (The Amerindio, The Voice of the Earth, Indian Natives, Anchieta)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81625289b18ee47b01426bbcd4417c6b89e1c6e55889cea7891660c9d5d890e4. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/HKI191409504.
Villa-Lobos: Symphonies Nos. 3, "War" & 4, "Victory"
Symphony No. 6, "On the Outline of the Mountains of Brazil": I. Allegro non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x657b550090958ad778cc7ddb0ec9402d7e64f646538dbee0d9ae4b170ea16ad1. 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/HKI191211701.
Rachmaninov : Concerto pour piano N3 - Piano Concerto No. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x739181c5196bab900664b3c5a10b69db2da9f9fd9f82e6f018734810e2d722e6. 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/FR6V80417118.