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 0x50537545d226be34d941eb8ebcaad293ee58a2aa817a7e6c1a3fd21528eed826. Chain 2 (Bitcoin): anchored in block 953765 (2026-06-15T08:55:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bb98423b-2a2d-4749-a830-74b57d8e2a53.json and https://artists.proofprofile.net/proofs/artist/bb98423b-2a2d-4749-a830-74b57d8e2a53.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Elena Langer: Landscape With Three People
Schnittke: Works for Violin and Piano & Suite in Old Style
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 0x9b214fc6cd438148e74789baade0d1f7231b41de41234985cfb540fb2b6df360. 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/GBGCS1600017.
Fritz Kreisler: Music for Violin and Piano
Poulenc, Debussy & Milhaud: Works for 2 Pianos
Rita Strohl: Great Dramatic Sonata "Titus et Bérénice" for Cello and Piano - César Franck: Sonata for Cello and Piano in A Major
Great Dramatic Sonata "Titus et Bérénice" for Cello and Piano: III. Lento tristamente
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f9e557efb38f550e6b4784aa67ec12158c1efad524703643a89caa72553768a. 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/NOFZS2377030.
Great Dramatic Sonata "Titus et Bérénice" for Cello and Piano: IV. Allegro molto movimento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x718495405422076429f35b2324ddd3cb4a139e0052f62e1dcc39763065c2ed5a. 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/NOFZS2377040.
Sonata for Cello and Piano in A Major: I. Allegretto ben moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4649d16db58f20a4c7d8161d3255e96e95c11c43f2b1f08289d005026e4499b1. 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/NOFZS2377050.
Great Dramatic Sonata "Titus et Bérénice" for Cello and Piano: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x693fdf6356fae299ed724f18c0be10ff2048c9c809684403218982a67fe566d8. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/NOFZS2377010.
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
Great Dramatic Sonata "Titus et Bérénice" for Cello and Piano: II. Molto movimento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae70b308b449df1b97a8e5c0a8933bea1682183f1c055da67a8aa1b56c40fb69. 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/NOFZS2377020.
Sonata for Cello and Piano in A Major: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5deab59c7e2d6907d052712e737f2a0781c9460b26e795721ddac073c96ce203. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFZS2377060.
Sonata for Cello and Piano in A Major: IV. Allegretto poco mosso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ff7faa948451b7d6f8a8a181bee10583eba10c468207163abcf57bf88813c79. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFZS2377080.
Stravinsky: Piano Ballets - Petrushka & The Rite of Spring
Mussorgsky: Pictures At an Exhibition - Shostakovich: Preludes, Op. 34
Grieg: Holberg Suite, Poetic Tone-Pictures & Lyric Pieces
Prokofiev, Saint-Saëns, Ysaÿe & Chausson: Violin Sonatas
Trio in A minor for clarinet/viola, cello and piano, Op. 114: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x802b15da2b254f771d0de97d78028240b95aaf3ff99a8151e16a86fc40ed73af. 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/GBPCP0800374.
Sonata in F minor for clarinet/viola and piano, Op. 120, No. 1: II. Andante un poco adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc153bb0907d7530bed2aa8017f82f1f6d5f45d769d46242dc3a845e28b1f41b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPCP0800361.
Violin Sonata No. 1 in G major, Op. 78 (arr viola Klengel/Rysanov): I. Vivace ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf90c57490f55158d99a64f47ac9f98b6eaef737a27fcca691442aeb596324029. 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/GBPCP0800364.
Rachmaninov: Two-Piano Suites / Six Morceaux, Op. 11
Suite No. 1 in G Minor, Op. 5 "Fantaisie-tableaux": No. 3, Tears
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1a3115833e1a8fb1825b432cd13d01f9536b30e6a01de38cd0e5dbe7b15e62d. 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/GBELX1706565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7024caa1789499bbafd54147fcf4dcab8557ce762d69bbb7234452d7cca7563. 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/GBELX1706572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c70a7026f3ae10cdc8fa70e83d87bde658d0e1ea475ccc81104a48543910c10. 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/GBELX1706575.
Suite No. 1 in G Minor, Op. 5 "Fantaisie-tableaux": No. 1, Barcarolle
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04899cdd585b4294960559ec12dd60214af489fb5021445cb2388b61900daf4. 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/GBELX1706563.
Suite No. 2 in C Major, Op. 17: I. Introduction
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3439d98b8f7095a01567e16a710eb177ddfa1e4644210626d509be6ff96b499. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBELX1706567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ff377ea9c12e4a642ac6bb9f28a8d7fcfdd88e6fbf99021254ec2a43141b935. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/GBELX1706571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f7775dc261200690510f37a2859978f4e66388d848d0a698c0b72b38ba65d79. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GBELX1706573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bd3205598400c30f169499e1d70e0bfecdd181712235d3b68b3d6fd5ec6ac37. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/GBELX1706574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01ce706dcbe28bb0ed0aca46e9ff1b20abd3ab91ae9ca52eee290ce794b73055. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/GBELX1706576.
Martinů: Rhapsody-Concerto, Viola Sonata, 3 Madrigals & Duo No. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8455a78a63ae4487798d5a988b37f092c16fb8e46dbdea6b1b88629274e7249b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEV1430010.
Brown: Piano Quartet, Violin Sonata, Prospero's Isle, String Trio