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 0x77def1ab7271a6bd4600bf45207fcd69902e4c566abcbdd054296177ae3c6404. Chain 2 (Bitcoin): anchored in block 953687 (2026-06-14T20:19:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6a5de160-59e2-4151-aac7-f093d3a36e21.json and https://artists.proofprofile.net/proofs/artist/6a5de160-59e2-4151-aac7-f093d3a36e21.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
György Kurtág: Scenes (Scenes from a Novel, Op. 19, Eight Duos for Violin and Cimbalom, Op. 4, Seven Songs, Op. 22, In memory of a Winter evening, Op. 8, Several Movements from Georg Christop
Labor: Piano Quintet in E Minor, Op. 3 & Piano Quartet in C Major, Op. 6
Galgenlieder à 3 (1996) Fünfzehn Stücke für Gesang, Schlagzeug und Kontrabass auf Gedichte von Christian Morgenstern: 1. Die Mitternachtsmaus
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 0x3f60b576600eb5be0612a02918efb5fa292ad43c6aa24df8bfaedfc8a3dd01c9. 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/ATK942202301 — a six-check JSON result.
Galgenlieder à 3 (1996) Fünfzehn Stücke für Gesang, Schlagzeug und Kontrabass auf Gedichte von Christian Morgenstern: 2. Nachdenken
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa7ec013a9ec296263a10eb9c19f5e33442422f44598467cf0834780f03d50d0. 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/ATK942202302 — a six-check JSON result.
Galgenlieder à 3 (1996) Fünfzehn Stücke für Gesang, Schlagzeug und Kontrabass auf Gedichte von Christian Morgenstern: 3. Das ästhetische Wiesel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cb4a86dac8aef0b9a60d49e847da800d0d85f6b446d8f3982e43eb1aad7721d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK942202303 — a six-check JSON result.
Galgenlieder à 3 (1996) Fünfzehn Stücke für Gesang, Schlagzeug und Kontrabass auf Gedichte von Christian Morgenstern: 4. Das Knie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01a5bc0c81bcd70b88a3480ec6bfec4589604048abe1ae456c828f5d00cbb37b. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/ATK942202304 — a six-check JSON result.
Galgenlieder à 3 (1996) Fünfzehn Stücke für Gesang, Schlagzeug und Kontrabass auf Gedichte von Christian Morgenstern: 5. Spiel I
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x400fbd824b0a4f2720ff75b816c186c185725d74c178c27c762d1287840497c4. 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/ATK942202305 — a six-check JSON result.
Galgenlieder à 3 (1996) Fünfzehn Stücke für Gesang, Schlagzeug und Kontrabass auf Gedichte von Christian Morgenstern: 6. Spiel II
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d868766715b228a315ef0de6691454cd6470fbfd64a6e1f64ce91efd4ed9801. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK942202306 — a six-check JSON result.
Galgenlieder à 3 (1996) Fünfzehn Stücke für Gesang, Schlagzeug und Kontrabass auf Gedichte von Christian Morgenstern: 7. Die Beichte des Wurms
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f43a184a7aecb54b1ceb3b23347c2dacbef3437beb193ed9b6556f49a98fca2. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK942202307 — a six-check JSON result.
Galgenlieder à 3 (1996) Fünfzehn Stücke für Gesang, Schlagzeug und Kontrabass auf Gedichte von Christian Morgenstern: 8. Psalm
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb01023663092c1405e1bdd57a1f1a1ce649b8d9efd932318334597973abc3279. Chain 2 (Bitcoin): anchored in block 960161 (2026-07-29T22:51:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK942202308 — a six-check JSON result.
Galgenlieder à 3 (1996) Fünfzehn Stücke für Gesang, Schlagzeug und Kontrabass auf Gedichte von Christian Morgenstern: 9. Der Tanz
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdffcb3cdce3219dd221cf0281f006ab7bf29aa23a366fd89160af5c2c4a765e3. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK942202309 — a six-check JSON result.
Galgenlieder à 3 (1996) Fünfzehn Stücke für Gesang, Schlagzeug und Kontrabass auf Gedichte von Christian Morgenstern: 10. Das Gebet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcca58bd87e7c50c3ea3222c65dc0678c6acd4b6225a3e5154557368256a6a21f. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK942202310 — a six-check JSON result.
Galgenlieder à 3 (1996) Fünfzehn Stücke für Gesang, Schlagzeug und Kontrabass auf Gedichte von Christian Morgenstern: 11. Das Fest des Wüstlings
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb380bde8f80a52abb1493c13a47a541080ac97026d1f95b2dc77333eadca7f0. 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/ATK942202311 — a six-check JSON result.
Galgenlieder à 3 (1996) Fünfzehn Stücke für Gesang, Schlagzeug und Kontrabass auf Gedichte von Christian Morgenstern: 12. Improvisation
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b23ebe427b773851a6ea123737bb72f1a20379011fd9dd855ac9b00b769123d. 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/ATK942202312 — a six-check JSON result.
Galgenlieder à 3 (1996) Fünfzehn Stücke für Gesang, Schlagzeug und Kontrabass auf Gedichte von Christian Morgenstern: 13. Fisches Nachtgesang
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61a9e5461bddf8a3b49e0ba33cbe0ce297389e734f9c60b04f6af0326011d2d8. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK942202313 — a six-check JSON result.
Galgenlieder à 3 (1996) Fünfzehn Stücke für Gesang, Schlagzeug und Kontrabass auf Gedichte von Christian Morgenstern: 14. Nein!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6cd1766f8c293809948abca6f257e1da549b145e888cc08e070a71042d201c9. 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/ATK942202314 — a six-check JSON result.
Galgenlieder à 3 (1996) Fünfzehn Stücke für Gesang, Schlagzeug und Kontrabass auf Gedichte von Christian Morgenstern: 15. Das Mondschaf
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5b8ffc1fda8c21f22d5a1ce1010fe12250342ea88555a41c5f61a4aaa979ca3. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/ATK942202315 — a six-check JSON result.
Rossini: Sonatas for Strings Nos. 4-6 – Hoffmeister: Double Bass Quartets Nos. 3 & 4
Rossini: Sonatas for Strings Nos. 1-3 - Hoffmeister: Double Bass Quartets Nos. 1 & 2
Sonata for Strings No. 1 in G Major: I. Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9ea52f7c2fd66934a28345d8384176b7bfd3868514bd6a5840bf88bc17f80b3. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEY1717010 — a six-check JSON result.
Sonata for Strings No. 1 in G Major: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6a864a43513d0f1a8cfb267ad1f640787beba5ea6c5f903019d0e71493e9901. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEY1717020 — a six-check JSON result.
Sonata for Strings No. 1 in G Major: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e3760be9a25da3fc713e9cbbfa0360bf543337e403f51903a6b59d545930c8e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEY1717030 — a six-check JSON result.
Sonata for Strings No. 2 in A Major: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ffc3ad259e80d9d5ce4fedeaf7a3220a05261e8705a3352186846d95ac39e4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEY1717070 — a six-check JSON result.
Sonata for Strings No. 2 in A Major: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77a9a494b26e538c5712b2a86532704db34a0673503aca9a1c40f55b7fd8df3b. 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/SEAEY1717090 — a six-check JSON result.
Brahms, Gubaidulina, Hindemith & Vasks: Sonatas for Double Bass
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2466ffe7a0235d9ea992c8f0d1d5dcfd68c944b95656382a87701dbc8505776d. 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/GBAJU1500693 — a six-check JSON result.