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 0xd20d920152fd9bb3e54d11235d402339c5127b5912a5e4e1107f56f3fb524939. 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/728152bd-aa5b-4d38-9345-b6e7a907568c.json and https://artists.proofprofile.net/proofs/artist/728152bd-aa5b-4d38-9345-b6e7a907568c.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Portrait Bronislaw Gimpel (Violin Concertos & Violin Sonatas in recordings for RIAS Berlin, 1954-1957)
Verdi: Macbeth (Live Recordings 1950) [Sung in German]
Ferenc Fricsay conducts Béla Bartok - The early RIAS recordings (live and studio recordings from Berlin, 1950-1953)
Edition Sergiu Celibidache: The Complete RIAS Recordings
Donizetti: Lucia di Lammermoor - Opernquerschnitt in deutscher Sprache
Richard Strauss: Burleske, Oboe Concerto, Duet Concertino & Till Eulenspiegel (RIAS 1st Master Release)
Concerto for Oboe and Small Orchestra in D Major, AV 144 / TrV 292: 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 0xbefde807f5c34aa2c2ee9a5e25bc55ef0ef81a0d2119c8c738cb4abcd2961a04. 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/DEE219560402 — a six-check JSON result.
Beethoven: Violin Concerto & Brahms: Violin Sonata No. 2
Béla Bartók: Two Portraits, Dance Suite, Piano Concerto No. 2 & Divertimento for Strings
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86372bcaf576238badbc5ae8d26ffcc8689304cfa4ed0d7aefc8217669e63726. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB639560102 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08252d366744012e87fa5098c000d983f1b696cb1da1e1c30a7b79cafe6515f1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB639560104 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfd5d12ae33998889cb6f7869455da289cc0962695a711a2c77c1455ba7c1086. 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/DEB639560108 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef2f9c3a335f9a49a0a22dc3f6887dfccf20265b5b8b9b0fc2d154903d002691. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB639560109 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb09f339420f345bbfbe92d7bedb69c5ecbb768db51a557b75f4142b229997e75. 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/DEB639560111 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8de5b276a2d000482f5a53e749fb2b844ecff73f02c022988a2c36dbe02a8d2. 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/DEB639560113 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a23f0a517603855678230b334f1716928e3e10efb24e6c503e188e46a0531d7. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB639560116 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd064c1cb300e84ab47eeb110bafb895145e20f9de33d2e9c7f675e55c85dc06. 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/DEB639560117 — a six-check JSON result.
Frédéric Chopin: Piano Concerto No. 2 & Franz Schubert: Symphony 'the Great' in C Major, D. 944
Tchaikovsky: Violin Concerto & Symphony No. 5
Haydn: Symphonies No. 48 "Maria Theresia", No. 53 L'Imeriale" & No. 101 "The Clock"
Dvorak: Violin Concerto & Symphony No. 9 ''From the New World''
Haydn: Symphony No. 44 'Mourning Symphony' in E Minor, Hob. 1:44 - Reger: Variations and Fugue on a Theme by Mozart, Op. 132 (History Records - Classical Edition 50 - Original Recordings Digi
Erica Morini plays Tchaikovsky, Tartini, Vivaldi, Kreisler, Brahms and Wieniawski
Peter Anders - Recital , RIAS-Kammerchor, RIAS-Unterhaltungsorchester and RIAS-Symphonieorchester , Ferenc Fricsay (First Master Release , RIAS studio recordings from Berlin (1949,1950 and 19
R. Strauss: Don Juan, Eine Alpensinfonie & Walzerfolge from Der Rosenkavalier , Rias-Symphonie-Orchester , Karl Böhm (First Master Release , RIAS studio recordings from 1952 and 1954)
Tchaikovsky: Symphony No. 4 in F Minor, Op. 36
Martha Mödl Sings Händel, Purcell, Gluck, Mussorgsky and Others
Rosenthal at RIAS: Gaité Parisienne & Offenbachiana (2025 Remastered Edition)
Rene Kollo, Vol. 4: Am Brunnen vor dem Tore
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x443d4a6b4cfd2e0c5fccf43e4a6cc028592c24c06b8a22417f1d543e883c0b02. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEU241109200 — a six-check JSON result.
Vintage Pop Nº 57 - EPs Collectors "39 De Fièvre'"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x359bfdb9eef12387feb0b8d5f1223abd5b99e65a6ca7d1dcdca656d63e67abdb. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USA370905829 — a six-check JSON result.
Deutsche Messe, D. 872: Zum Eingang: Wohin soll ich mich wenden
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8eb419829a633a971be8dde2308603c1de23ddff14fcbc2ad83c7fcdb48e70d. 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/USB8U1014755 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x590c2949db5c7e7976312be142e8492139295bbeb22a41e46dca6b13f6c56cb0. 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/DEU241109190 — a six-check JSON result.