Jorge Grundman Isla (born 1961) is a Spanish classical composer, musicologist, musician and professor who has helped to recover the music of Robert Kahn and Adalbert Gyrowetz among others through the
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 0xba12e02d1cb3bd4a33e47e1036b111353812b1aa69caeb2dbb1630fbd52f4a23. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cb2029b6-8593-48fb-9043-13de05191622.json and https://artists.proofprofile.net/proofs/artist/cb2029b6-8593-48fb-9043-13de05191622.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Jorge Grundman: Surviving a Son's Suicide & God's Sketches
Jorge Grundman: W Sonatas for Violin & Piano
Grundman: A Mortuis Resurgere (The Resurrection of Christ)
Two Etudes for Piano: I. We Are Forthcoming Pass
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 0xe8fe6900a8f57784e17475de74692275fb3981ac9c58bd82b42ae1f9dcd38ddd. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ES5021700608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7992a20a4c461fe84be63bafd51e8dc9d33bf52c084d11678e82ec8a7a4b1db7. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ES5021700620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd156f4f0c2414e203ae3c271a53bacf3b5b196ddabc061491d8c42a3a11c884b. 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/ES5022101602.
Concerto for Cello and String Orchestra Op. 76. Act of Contrition: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1258f43f9775e2b8a4e756cdbc0452d562175d689cc96cf2b90c578ac9021c5c. 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/ES5022101606.
Concerto for Cello and String Orchestra Op. 76. Act of Contrition: VI. Epilogus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5bde6874a7ac72888b0f790bc1ff3ecac5c4819bfef413ad54643e53496ad3d. 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/ES5022101609.
Concert Sentido for Violin, Viola, Cello and String Orchestra: IV. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78023f9cf92c4365a8a1fe12b6ff96d878623004664cf00e09a669a51859e502. 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/ES5150700046.
Jorge Grundman : Concierto Sentido for Violin, Viola, Cello and String Orchestra : I Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb91b08f75bff79e88163e0da7c6095d52346c0809f9fb5ba7643bc2aea33ac94. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/ES5150700043.
Jorge Grundman : Concierto Sentido for Violin, Viola, Cello and String Orchestra : II Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb16d8a8a4acad44df52cde0f3f3f11ec4f12ee37fa9b04d40a2f2875fcd5c2d3. 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/ES5150700044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78023f9cf92c4365a8a1fe12b6ff96d878623004664cf00e09a669a51859e502. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ES5150700046.