Tabea Zimmermann (born 8 October 1966) is a German violist who has performed internationally, both as a soloist and a chamber musician. She has been artist in residence of the Concertgebouw Orchestra,
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 0x1aad672d5b3ed4c8c75a9e0bc33c8a82a92fed82b4e3ade81b8c74bbaca24e32. 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/2a56fcac-23ca-4ba8-9269-2970e22b0c79.json and https://artists.proofprofile.net/proofs/artist/2a56fcac-23ca-4ba8-9269-2970e22b0c79.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mozart: Sinfonia concertante for Violin and Viola, K. 364 & Symphony No. 40, K. 550
Mozart: Sinfonia concertante in E-Flat Major, K. 364: I. Allegro maestoso
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 0xf5fac361a3f81c2fc713f4fa14fc2f4a47bd95498c7c5ae39adb390564f1aadc. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/GB01A2100180.
Mozart: Sinfonia concertante in E-Flat Major, K. 364: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4a207c8a19fc64f3ba80a242c73400310e61db52e03368ea143f37a0ee368b4. 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/GB01A2100181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd52521ef9640a8223f47dd3cedf9fcb5f823975bf5c490c60100fa0e3f7db99d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DELN21002001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d3efa8db4459042695f1644bc1cf69c5880d75f2066eea1ac0f754c40706b0. 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/DELN21002002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0626122077ce66276ef2059ef1c4fc07b5a6bd2bb2b88a91442a69cc09f28c4. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DELN21002003.
Viola Sonata in B-Flat Major, Op. 36: I. Maestoso - Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b5a6308637c5cfc42057c2d9633b043683e793643546b1f4c07936bcd3f0339. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DELN21002004.
Viola Sonata in B-Flat Major, Op. 36: II. Barcarolla
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2d481931c53af7f235d1c8c266cf84166ecce2987ab6dc2282d1abd4a4ffa7d. 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/DELN21002005.
Viola Sonata in B-Flat Major, Op. 36: III. Finale scherzando
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86182aa7bbb7392c8ad8f43fe510a97b66161c290dc90a77ff6e6fc339fed3fb. 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/DELN21002006.
Clarinet Sonata No. 2 in E-Flat Major, Op. 120 No. 2 (Arr. for Viola & Piano): I. Allegro amabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a8d0ab1c2371bf8e32c8325dbbecda279134bcbaa5e636cca8db57677dcc70. 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/DELN21002007.
Clarinet Sonata No. 2 in E-Flat Major, Op. 120 No. 2 (Arr. for Viola & Piano): II. Allegro appassionato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9f69ff2d8524e08b3264e9e7183f466ad7a19f81e2ea11c7d787a21a002ef2e. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DELN21002008.
Clarinet Sonata No. 2 in E-Flat Major, Op. 120 No. 2 (Arr. for Viola & Piano): III. Andante con moto - Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f854bc862c2434b762d8200adb2e7da1768003a3cb1924e6149672adb4f76fc. 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/DELN21002009.
Winterreise, Op. 89, D. 911: No. 21, Tauschung (Arr. T. Zimmermann and H. Holl)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcb1068978e17398b4458bde3ca52b605eaf513260334fcfebd2dec4445e3756. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US2TL0904921.
Piano Quartet in G Minor, K. 478: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x483f10571f1838944417f5237e1011774c25f77ad27ecaee2531a022659ce27a. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/DEC628800716.