Leonid Gavrilovich Grin (Russian: Леонид Гаврилович Грин, IPA: [lʲɪɐˈnʲid ɡrʲin]) (born ) is a Soviet-born American conductor. Biography Grin was born in Dnepropetrovsk, Ukrainian SSR (today part of
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 0x36fc0ed43b42b64f7e859352d9e6bccac8f6316e1ba7b9022f3cf0f324e42b69. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4371c220-47e9-470e-9db9-675dd56082fd.json and https://artists.proofprofile.net/proofs/artist/4371c220-47e9-470e-9db9-675dd56082fd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Rubinstein & Moszkowski: Piano Concertos
Tchaikovsky, P.I.: Seasons (The) / Hamlet Entr'Actes
Land of the Midnight Sun - Music and Images From Finland
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 0x03e974cd3b0d10431a477d9bb8bbd00371897eee82e61d382d3a2c90b767d3a5. 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/USSM18100545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e992c120a9f5adcdfa427bdbb59c4adee85b93bd9ebd07d645957354c957ae5. 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/DELV41700756.
Shostakovich, D.: Shostakovich - 100 Years Celebration (1906-2006)
Land of A Thousand Lakes - The Beauty of Finnish National Romanticism: Music of Sibelius / Kaski / Melartin / Merkanto / Jarnefelt / Klami
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e7bacb075e9f7064e18d12d74ecd2a715a247ce6c908c3f01eb4a14897e3e2e. 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/FINDE9400024.
Prokofiev, S.: Waltz Suite / Pushkin Waltzes / Summer Day
Prokofiev, S.: Symphony No. 2 / Summer Night / Autumnal Sketch
Shostakovich, D.: Hamlet Suite / The Gadfly Suite
Shostakovich, D.: Movie Madness - Selections From Film Music