Leo Ornstein (born Lev Ornshteyn; ; – February 24, 2002) was an American experimental composer and pianist of the early twentieth century. His performances of works by avant-garde composers and his o
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 0x506e5c3b793e646d0f1c5195a8c95a1417884286a03906273f0a58fc1dc0711e. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9862fb44-6546-454c-87cb-545ab87d3227.json and https://artists.proofprofile.net/proofs/artist/9862fb44-6546-454c-87cb-545ab87d3227.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Leo Ornstein Respectfully Prepared For Piano Vol.3
Leo Ornstein Respectfully Prepared For Piano Vol.2
Leo Ornstein Respectfully Prepared For Piano
Leo Ornstein: Piano Quintet & String Quartet No. 2
Leo Ornstein: Complete Works For Cello And Piano
Six Preludes For Cello And Piano: I. Moderato Sostenuto
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 0x6109a79aae713a89ae0e43191bfa0d688cfcbef0d32bb94e6ba0d9c833774f3a. 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/US4QP0765501.
Six Preludes For Cello And Piano: V. Non Troppo (Quasi Improvisato)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfebbc4f15e0cfbe5867f52fa3495597a9725792f9b8132fd3827cd84767e01a. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/US4QP0765505.
Sonata No. 1 For Cello And Piano, Op. 52: III. scherzo (vivo, ma non troppo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc19ddf8c4780cb6e66b61724e6466ddb6bed95f4761134811a165b94ccebc452. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/US4QP0765510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79e923559b7f70bf73993a395a504c2109a544432a1970ae38b7741d38d2b7c4. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/US4QP0765514.
Six Preludes For Cello And Piano: II. Con Moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b7fcb5c122a11b00ccee68b42b8e48c55511e345bbe65862dfaaa9fb1932c13. 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/US4QP0765502.
Six Preludes For Cello And Piano: III. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ebe39433077dea3f90268697698a098cecb40eb05e5984d21f383b0fc98134a. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/US4QP0765503.
Sonata No. 1 For Cello And Piano, Op. 52: I. Allegro Appassionato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbdb70fbae13c55caa196a832d265204f9d4506f59f327636604c7ddf32e7667. 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/US4QP0765508.
Sonata No. 1 For Cello And Piano, Op. 52: II. Andante Sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc71ad182770e524ddf77f0672fedbc820e068f0cc0dbf5aa34a87515bede639a. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/US4QP0765509.
Sonata No. 1 For Cello And Piano, Op. 52: IV. moderato (con moto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x587f67b3c33abdf48e296676941d7fccc4d8112874e0801225b914b34ee9fbfa. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/US4QP0765511.
Leo Ornstein: Piano Quintet, String Quartet #3
Ornstein: Sonata For Cello & Piano - Prelude tragique
Danse Sauvage: Early Piano Music Of Leo Ornstein