Amihai Grosz (; born in 1979 in Jerusalem) is an Israeli violist. From 1995 to 2009, he was the violist with the Jerusalem Quartet. Since 2010, Grosz has been the Principal Violist of the Berlin Philh
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 0x1bf164c620a66784b2782c1a38a7130a7bfd130853286f84ca8705cca1ac3769. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e9cc78e0-2d77-454e-9c14-2b39a6bf3119.json and https://artists.proofprofile.net/proofs/artist/e9cc78e0-2d77-454e-9c14-2b39a6bf3119.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bartók: Concerto pour orchestre - Concerto pour alto
Concerto for Orchestra, Sz. 116: Concerto for Orchestra, Sz. 116: IV. Intermezzo Interrotto. Allegretto
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 0x44b47b081a91391a171a1311af018b6a9d0fb0067139b579bd3283dda8d8c25c. 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/FR50X2201304.
Concerto for Orchestra, Sz. 116: V. Finale. Pesante-Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfce918bce6ef9cb8a23632ebd841d6b56b8ae91f130384436f7192a61822b785. 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/FR50X2201305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d95db615c312707c631effafc9806c776ca30575f18c074ce98d7bc0210b70b. 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/FR50X2201306.
Viola Concerto, Sz. 120: III. Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6e3aa7cd3a03604af39cff5318d516733c4b4eae2e04bf042edc6b4ee4b0ac7. 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/FR50X2201308.
Viola Concerto, Sz. 120: II. Adagio religioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e8cd99270f87305dd798223a8e5f4e224edfd28ea870b568e54a85fb1c0e9c. 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/FR50X2201307.
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
Schubert: String Quintet - Schoenberg: Verklärte Nacht
Verklärte Nacht, Op. 4: 1. Sehr langsam (bar 1)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07ae1e22b84c850caea9cd9facdb8bbad2157f76d271aa907ab118f29baf1125. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/GBF071202771.
Verklärte Nacht, Op. 4: 4. Sehr breit und langsam (bar 229)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x779271e725efb2f7e9fc5ee4b0779d390fbac1e576bdbc6ee0355d0bb6adcc8c. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/GBF071202774.
Verklärte Nacht, Op. 4: 5. Sehr ruhig (bar 370)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb7c67b42ca714eae0337f65677cd2bfd32892b9fdd9daf7cd1506204600998. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), 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/GBF071202775.
String Quintet in C, D.956: 4. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf65009e01df4e12ae2160961448d52eb1d2e1c1e6dcb9b2ea8897d8e0654abc2. 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/GBF071202784.
Verklärte Nacht, Op. 4: 2. Breiter (bar 200)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a137667b17ee7b580f875d48c70da80a1558c4669d726e8e51cd297cba99d3a. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/GBF071202772.
Verklärte Nacht, Op. 4: 3. Schwer betont (bar 201)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b9c022013e13fea13f93f4a7cd133e9b1eebbb52308d0b9636db0724da9e9fe. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/GBF071202773.
String Quintet in C, D.956: 1. Allegro ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5cb62072e00d76ebc755fdcf61f26c74762f8291a6b93476eb7d66e3220f218. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/GBF071202781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f7868cccff8e292cc276c5c1822bbf5c6e0152148d60f8f242ddce4c9665ec7. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/GBF071202782.
String Quintet In C, D.956: 3. Scherzo (Presto) - Trio (Andante sostenuto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x302ee1c4cd30158cb7651dc78643b906d4c1bf7ffe4da991c304c485621bb4b4. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/GBF071202783.