thumb|212px|Wilhelm Taubert in 1862. Carl Gottfried Wilhelm Taubert (23 March 1811 – 7 January 1891) was a German pianist, composer, and conductor, and the father of philologist and writer Emil Tauber
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 0xc6477ea6239c061829f027263e71b790ad031290be0084e7ec9f62c340e0f1db. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/20896e9d-7023-443c-be96-08124d875860.json and https://artists.proofprofile.net/proofs/artist/20896e9d-7023-443c-be96-08124d875860.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Piano Sonata No. 4 in C-Sharp Minor, Op. 21 No. 2: II. Romance. Andante con moto
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 0xfd7e48aeefb720c3b545df05a7a3d6f77fb9cbaccb9aa3cc1dc76a9ce4099edb. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T08:03:16Z), 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/HKI192425408.
Piano Concerto No. 1 in E Major, Op. 18: I. Allegro vivace
Taubert & Rosenhain: Piano Concertos (Hyperion Romantic Piano Concerto 51)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c4e4a13a58ae291cf65e4066486507176323acb69a577d8f7ce1e30777c5283. 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/GBAJY1076501.
12 Gesänge, Op. 27: V. Wiegenlied "Schlaf in guter Ruh"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x101c95bc74451f7e0c396ccc9e028b8aa553ac6750c48a2fad72b2ed62e5acbb. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/DEB111000815.
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
12 Lieder Op.68, Nr.7 in F Major, IWT 28: Wiegenlied (Arr. for Harp)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d81ee6082542ee308e38db8b87f42101e271d8b26493eeab0e28ea2d1c09572. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/DEZC62131077.
12 Gesänge Op.27 in D Major, IWT 19: Schlaf in guter Ruh! (Arr. for Harp)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7639489dd81347c22fcdb70ecc5f1cc9f126563a50c9ab8d2a0a396321409e94. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEZC62131079.
Piano Concerto No. 2 in A Major, Op. 189: I. Andante cantabile – Allegro marcato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81ff049df0a2626c9afb7af2424fa6beca29cd24746e3fa507cc92937ee57194. 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/GBAJY1076504.