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 0xb1657e52c0a11a879ba0aae3c4c05574f8459c6b1dac35b5ca1c9f7a29cf517a. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0662ad7a-7552-4fd6-b9a1-7667b68cc1b0.json and https://artists.proofprofile.net/proofs/artist/0662ad7a-7552-4fd6-b9a1-7667b68cc1b0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sonate en la mineur pour arpeggione et piano: I. Allegro moderato
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 0x85b6393d02b897834e149946f5030c9c232160875c0ccdb7ea65386673c6d44c. 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/FRZ130914010.
Sonate en la mineur pour arpeggione et piano: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe81b802864220a3daa99ff11495bd08651e9745ff30364e9eb39f99a6500107. 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/FRZ130914020.
Sonate en la mineur pour arpeggione et piano: III. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b7bb0d4f0fdfd85503250ede651215ab4aa4b92592aa9b930edf45c1a108d32. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/FRZ130914030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb3ebc24cebe999c32e1d42bfb749c6656112a7bc4620a818b6aba0ce4ae216b. 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/FRZ130914040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12cded584d99e6393ad8ccf2c4b60fc9abef9564899c1962e11af27c4b9afd6e. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/FRZ130914050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b41a0f0ce7f860733c1bc57674486ce0a30e65ef2d68a484cc4a8cf73637695. 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/FRZ130914060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8962a7ad82c79eb1fb6cdcd850bd334921ea08e8f2350ecc72402acc8c5716d. 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/FRZ130914080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x321edd23012c23af11b647445305cc9979d3e1a911061362bf032e295febee73. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/FRZ130914090.
Ich schleiche bang und still herum (romanze der Helene)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cdcd3dc37a0a4ae9d3ec6e6178ca905dfdf649b835be2e17879981fb878e0a9. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/FRZ130914100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a83f059c9ddaae2e20d5ca308599bf7c618189652a16be2c95fecc9a6b647a7. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/FRZ130914110.
Shostakovich: Sonata for Viola and Piano - Schnittke: Concerto for Viola and Orchestra
Sonata for Viola and Piano: II. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4ca98f3cc279cd9e5c7a4019e8d16bcf5b688efd641b6908c4b1c1ec1774e5a. 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/FRZ130807022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a905f2ea76594a2a9430ae6c7694e5bf0757250c2b4bb9470382b471b4746f1. 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/FRZ130807023.
Carmen Concert Fantasy, Op. 25: IV. Allegro moderato
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Violin Concerto No. 1, Op. A-7 "Concierto español": III. Allegro molto
Orquestra Simfònica de Barcelona i Nacional de Catalunya
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The Soldier's Tale Suite: II. Airs by a Stream
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8545a38a2ec21fc97635937385aff4110d02aa336721580b8a9f4f86e7d469d0. 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/HKI191517002.
Caprice basque, Op. 24: Capricho vasco (Basque Caprice), Op. 24
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Sarasate: Violin and Piano Music, Vol. 3
Sarasate: Violin and Piano Music, Vol. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29da33533da43a2fdc183cfce5d4caf460c1e9db95b43e8dfb4e6290b9406796. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/HKI190709806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32167d952e6a4586aeecb2a5e0f0e3bf3fda6d02b667d0cbba93d2280135c214. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/HKI190709802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c1a467afc4b5e49a0018207169b087b8497e8b74a426ad80080a809c197f80. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/HKI190709803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8547c59c4af8c1b7b886be16bcaa826a88adf5a413f090e33f87ce18a2037bf2. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/HKI190709804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ec79605702bf181a9fc622a81ca8e02ad47ccae5502ee8fe333f8115ec81b2e. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/HKI190709805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab3021a2952f9f284f9548e7e14ee17a9fdf27ce69a3e9fa7d7c8adb3bd1f224. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/HKI190709807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x643ebaf65d8fbcb8088e5e5143ad177e225715ecabbe883bb1ebc6ad90e02793. 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/HKI190709808.
Concert fantasie on La forza del destino, Op. 1
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Sarasate: Violin and Piano Music, Vol. 1
Spanish Dances, Op. 21: Danza espanola No. 2: Habanera, Op. 21, No. 2
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Spanish Dances, Op. 23: Danza espanola No. 5: Playera, Op. 23, No. 1
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Spanish Dances, Op. 21: Danza espanola No. 1: Malaguena, Op. 21, No. 1
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31fea190cb0b8663af2f3a8b9ac064e215ed3ef94e1797f64c97f12fad1e9b51. 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/HKI190548604.
Spanish Dances, Op. 22: Danza espanola No. 3: Romanza andaluza, Op. 22, No. 1
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Spanish Dances, Op. 22: Danza espanola No. 4: Jota navarra, Op. 22, No. 2
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe78399cc061be404e9c1bc9678617f834f90ed9d45cc8ca0fffa519e52df8519. 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/HKI190548607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x864192a50acb38f410781da9c3c92f0978ee4ab8ad3bb65140b78fa605b62c30. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/HKI190548608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3d41c5f35a654e5decc97aadf17ec14792d1d5d4527a3388ec5b68fc2638a51. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/HKI190548609.
Spanish Dances, Op. 23: Danza espanola No. 6: Zapateado, Op. 23, No. 2
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Spanish Dances, Op. 26: Danza espanola No. 7: Vito, Op. 26, No. 1
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Spanish Dances, Op. 26: Danza espanola No. 8: Habanera, Op. 26, No. 2
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Zemlinksy, Brahms & Škroup: Trios Piano, Clarinet & Cello
Brahms: Wie Melodien zieht es mir – Selected Songs
Es war einmal ein König ("Flohlied") No. 3, Op. 75
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Auf dem Wasser zu singen, Op. 72, D. 774 - Arr. for Arpeggione and Piano
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Orlando Furioso, RV 728: II. Sol da te, mio dolce amore (Aria)
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Piano Sonata No. 8 in C Minor, Op. 13 "Pathétique": II. Andante cantabile
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Douze études, Op. 25: No. 1 in A-Flat Major, Allegro sostenuto
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Le nozze de Figaro, K. 492: Voi, che sapete che cosa e amor
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Nocturne No. 2 in E-Flat Major, Op. 9, No. 2 (arr. P. Sarasate for violin and piano)
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Waltz No. 3 in A Minor, Op. 34, No. 2, "Valse brillante" (arr. P. de Sarasate for violin and piano)
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Serse (Xerxes), HWV 40, Act I: Ombra mai fu, "Largo" (arr. P. de Sarasate for violin and piano)
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Waltz No. 8 in A-Flat Major, Op. 64, No. 3 (arr. P. de Sarasate for violin and piano)
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