Daniel Gortler (Hebrew: דניאל גורטלר; born April 12, 1965) is an Israeli pianist. Education and early life Born and raised in Israel, Gortler began studying classical music and piano with Naomi Hacho
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 0x9008912529ead7f6fbec12422018e1905af522da9f8143f6505651350d91305a. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b87bb0d2-e4d1-4fbf-8f7c-6fe2ae2c73f7.json and https://artists.proofprofile.net/proofs/artist/b87bb0d2-e4d1-4fbf-8f7c-6fe2ae2c73f7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x183731e44df5f23692e4d3f57d8fb151c3d7da7b781e3ac4b07373392cd92288. 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/CHE272301833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe64c67d8b3abd9ba7c623e27de8ff865b5dc1c7ca085ae49a363d1a8937264ad. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/CHE272301834.
6 Lyric Pieces, Op. 54: No. 3, March of the Dwarfs
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6 Lyric Pieces, Op. 57: No. 1, Vanished Days
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9433d489feafcbd9d85f8b1858c24fff3df8cb6f30f5f6ba74f08073b402506. 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/CHE272301836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9c3c07ad5b0ba6ba81442fc719b14f68ad79df156578ba710badfafffb50ece. 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/CHE272301837.
6 Lyric Pieces, Op. 43: No. 6, To the Spring
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7 Lyric Pieces, Op. 47: No. 4, Norwegian Dance
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f4b6b62e69fe1c85b19d0e5f4711997822812f6cdfdebd23f8253c7e457a76. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/CHE272301843.
7 Lyric Pieces, Op. 47: No. 2, Album Leaf
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x371ed9c56114cd665cb997ddd5e8cc1bfbb3b9fe33d27bab0a8f41622204b4d4. 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/CHE272301846.
6 Lyric Pieces, Op. 43: No. 4, Little Bird
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6 Lyric Pieces, Op. 68: No. 5, At the Cradle
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7 Lyric Pieces, Op. 71: No. 4, Peace of the Woods
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Kinderszenen, Op. 15: No. 7, Träumerei (Arr. for Violin and Orchestra)
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Souvenir d'un lieu cher, Op. 42, Arr. for Violin and Orchestra: III. Mélodie: Moderato con moto
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefbdffa085a2126389ede4455231c21cb7f0372dffd368dcc8e931491edf420b. 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/USBC10200821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad3895fb77728bc1e80c6da3219907d0ef8c6975cd58668a3f2674000ba492d3. 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/DEE471100232.
Melodía for Violin and Orchestra, Op. 1, "1890"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x143038180e284d101445e2a7e514bfc5fb27a2b9c53c3aeec988ffcca9051803. 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/USSM11000993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6344a881c9289be8d31a9e49c0080aea256cafe62129e1e6e6965c89cea03343. 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/DEE471100234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9db88e115d23795439a133ebd86d542c41f81ecffb6d6df1b1e13c5657554865. 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/USBC14606614.
Preludés, Livre I, No. 8: La fille aux cheveux de lin
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The Four Seasons - Violin Concerto in E Major, Op. 8 No. 1, RV 269 "Spring": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcea58bc80fd5332eaa41f0d59f0925c8b354d5708bf2a7ed877a84b3e33dc648. 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/USSM10800885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01faa034da6a74c6ab838d715333aecba7fed8acaf5204336c9a3ddd8014b5ec. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USBC10200829.
Ich mag keine Klassik, aber das gefällt mir!, Vol. 5
Music for the Royal Fireworks, HWV 351: I. Overture
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Symphony No. 40 in G Minor, K. 550: I. Molto allegro
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Serenade No. 13 in G Major, K. 525, "Eine kleine Nachtmusik": II. Romance. Andante
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Il barbiere di Siviglia: Largo al factotum
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49c06514d26a560d4c27b54c07c00b147a3ee6da111e08c917bc8be10c8829ad. 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/USBC19606238.
Songs Without Words: Mendelssohn Played by Daniel Gortler
Grieg: 8 Lyric Pieces, Op. 38: No. 1, Berceuse
Grieg: 6 Lyric Pieces, Op. 65: No. 5, Ballad
Grieg: 6 Lyric Pieces, Op. 54, No. 4: Notturno
Grieg: 6 Lyric Pieces, Op. 65: No. 2, Peasant's Song
Grieg: 7 Lyric Pieces, Op. 71: No. 3, Puck
Grieg: 7 Lyric Pieces, Op. 71: No. 4, Peace of the Woods
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Grieg: 6 Lyric Pieces, Op. 68: No. 3, At Your Feet
Grieg: 8 Lyric Pieces, Op. 12, No. 1: Arietta
Grieg: 6 Lyric Pieces, Op. 47: No. 2, Album Leaf
Grieg: 6 Lyric Pieces, Op. 54: No. 3, March of the Dwarfs
Grieg: 6 Lyric Pieces, Op. 43: No. 2, Solitary Traveller
PROSPERO Catalogue 2024 - Our Listening Tips I: Composers A - Z
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x836e9266fe887d4b88a4d0909a75704433003c74284b2c229401d74ade5becf0. 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/USSM11102897.
Ich mag keine Geige, aber das gefällt mir!