The Latvian National Symphony Orchestra (LNSO; ) is a Latvian orchestra based in Riga. Its primary performance venue is the Great Guild Hall in Riga. In addition to regular symphonic concerts, the o
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 0xf6c5f36ee36d067839dc4d78619281885ffffe34f525f2e38eedbbeb77c177ab. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5e8c1e7e-26ba-4bab-ae5e-48355f220dae.json and https://artists.proofprofile.net/proofs/artist/5e8c1e7e-26ba-4bab-ae5e-48355f220dae.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Sibelius, Bartók, Pone, Kalsons: Violin Concertos, Valdis Zariņš
Jānis Ivanovs: Piano Concerto in D Minor & Symphonies Nos. 14 & 20
Ķeniņš: Symphonies Nos. 4 & 6 & Canzona sonata
Ķeniņš: Symphonies Nos. 5 & 8 and Aria per corde
Tālivaldis Ķeniņš: Violin Concerto, Concerto for 5 Percussionists and Orchestra, Beatae Voces Tenebrae
Pēteris Vasks: Oboe Concerto, Vēstījums & Lauda
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 0xaf2c09eb505f4ca6739d6d0eb996bf1d543c6a146ca4d7153e84a58e3c9ce19e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FINDE2000228 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x645ac74c969192449bb01520c0a4bfe036b59299027bb47f7e9b5f4c5aa96241. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FINDE2000229 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73b459b8b9e93659b188da24da37128220c713ed7db3459550ebf1662c2a9c26. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FINDE2000231 — a six-check JSON result.
Arturs Maskats: Accordion Concerto, Tango, Cantus diatonicus & My River Runs to Thee
Ramans: Divertissement for Flute, Trumpet, Piano, Percussion and String Orchestra – Concerto for Saxophone and String Orchestra – Concerto Leggiero for Nine Jazz Instruments and String Orches
Latvian Radio Archive: Volfgangs Dārziņš
Suite for String Orchestra, Op. 60: IV. Dream
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9136c210efdbd63f6c026ff491659c5f02b6510a76656cecf93297c7ce2dc3a5. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWSJ0900809 — a six-check JSON result.
Symphony No. 1 in C Minor, Op. 7: I. Allegro patetico
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae0bea2d873173b84f96efa3829d6c98019856501dc0387bc18b932f0014737c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWSJ0900601 — a six-check JSON result.
Variations on a Norwegian Folktune, Op. 31: I fjol gjaett'e gjeitinn
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5663a25720b3e8d8ad41da4bf2b466e068fb949e972b425a898682db2fba27d0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB200837216 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7cf9be66380b5b992f4874d9cb7916d498c2a87540d66cdee8f5b760c2b6a89. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB200837214 — a six-check JSON result.
Davidoff: Cello Concertos Nos. 1 and 2 / Tchaikovsky: Variations On A Rococo Theme
Cello Concerto No. 1 in B Minor, Op. 5: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499f39e378175bf110a35e87a1d668f284792c9a69fd056f45355078260647ee. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB200726301 — a six-check JSON result.
Concerto for Viola and Orchestra: Adagio con fantaisa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4870d4b2ab47f418621839ca75c0979baa6b4594befb3325ff5d744b8b070d54. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USAB10614050 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b71d97fa962bcbf850852b55877725441a075c2c987baaa6ad4270e34de52c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USAB10614053 — a six-check JSON result.
Concerto for Viola and Orchestra: Gently flowing
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a1f4d40acad1add7ee8e481370480a44ec4e57eac8fc3cfcb87b1dd6870a35a. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USAB10614056 — a six-check JSON result.
Concerto for Viola and Orchestra: With verve and drive throughout
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x779a37faab78a895fb4924d0105e8ea8725e33b0a4dcdb1cda2bb5444d6df397. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USAB10614058 — a six-check JSON result.
Opera Arias (Favourite): Garanca, Elina - Mozart, W.A. / Rossini, G. / Bellini, V. / Donizetti, G. / Massenet, J.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01dd5eebab9a1b3839efa6e01a2af110371fc4e38ff6ecd5e38803fce13d6157. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/LVA109900046 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62fa955c95f22f23f6b024622e0e5f023b4fa58540a9ed37b23eb61a799d7f47. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/LVF251400010 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc9c759ac33a23077b933dad494b0a44f88ca357499e420616c1f35835be974e. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/LVA109900057 — a six-check JSON result.
Vitols: Dramatic Overture / Fantasie / Spiriditis / 'Autumn Song'
Il barbiere di Siviglia (The Barber of Seville), Act I: Una voce poco fa qui nel cor mi risuono
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1c947360b085464c1ce2ad1659eea4248ee1f41cff221f0c5bc3ed336634dd5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FINDE0100100 — a six-check JSON result.
La clemenza di Tito, K. 621: Act II: Deh per questo istante solo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2f1f40ef6073449bcd49ffad3ce0579a987f9e2dfec2b7c1f6dff8da5bb6b11. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FINDE0100098 — a six-check JSON result.
La Cenerentola (Cinderella), Act II: Nacqui all'affanno e al pianto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae1cbda071fa5b282d68363ef81fb87b8a130ab0f61439e8e2b115f1956a08aa. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FINDE0100101 — a six-check JSON result.
Die Hochzeit des Figaro, K. 492, 3. Akt: Canzonetta sull aria… Che soave zeffiretto (Die Verurteilten): Act I: Non so piu cosa son, cosa faccio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c7b366883e9f6c8226eb2bdd8093cb1c27c2cb70a01002f6b4971719677b3e9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FINDE0100096 — a six-check JSON result.
Die Hochzeit des Figaro, K. 492, 3. Akt: Canzonetta sull aria… Che soave zeffiretto (Die Verurteilten): Act II: Voi, che sapete che cosa e amor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8136a14ae9dcda2532d474dfc5ee3958f717cc4579b0148c1f88f8fb6aefddc. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FINDE0100097 — a six-check JSON result.
La clemenza di Tito, K. 621: Act I: Parto, ma tu ben mio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31d1fb0bcc7e3f52b947ed177a7c6ff2759ebe3540cecf0531fab6933c582c7a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FINDE0100099 — a six-check JSON result.
Anna Bolena, Act II: Per questa fiamma indomita alla virtu preposta
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfac4a996790d4e7ee89c63ca87b8104352c26ddbf3d69d0d5027e24f4c695749. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FINDE0100104 — a six-check JSON result.
I Capuleti e i Montecchi: Capuleti e i Montecchi, Act I: Se Romeo t'uccise un figlio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ade93aaecd69dd4f58d8a3064aaa270329c1caf67b769606fe94f87773a3550. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FINDE0100102 — a six-check JSON result.
La favorita, Act III: Fia dunque vero, oh ciel!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbb88bad840ebfec4fca114a042ef19679b9bb653301590459eb1c5aa643b24b. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FINDE0100103 — a six-check JSON result.
Werther, Act III: Werther! Werther! Qui m'aurait dit la place
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a3289dde462d92d529f4c7fc46dd082771da0b18f12126693384e6af5a93f5b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FINDE0100105 — a six-check JSON result.