Erik Werba (23 May 1918 – 9 April 1992) was an Austrian classical pianist who is especially known as an accompanist of singers. He was also a music critic, conductor, composer, author and academic tea
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 0xa85996fdb06d1895fea5bc0dbbc76e43c2f91571ad09bdfd82e980d78fa6deff. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cfbf9333-081b-4ded-8773-723bcddb4c7f.json and https://artists.proofprofile.net/proofs/artist/cfbf9333-081b-4ded-8773-723bcddb4c7f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Wolf: Italienisches Liederbuch, Morike-Lieder & Spanisches Liederbuch
R. Schumann: Frauenliebe und -leben, Op. 42 & Ausgewählte Lieder (Live)
Mozart, Beethoven, Schumann & Others: Goethe Lieder (Live)
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 0x73c7eea402282ea41e6a010bad2ff2d0403a469e278e61abceb1dcfdebf8dcda. 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/DEF055702480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54273fb0773f6bce06dbad2767fe2158749a84fab705d32e3d274d48b6d73660. 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/DEF055702540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0af542be71c7a65c335a875dd6905aaad3246292f4e1e4e023e5c25a588d8f3c. 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/DEF055802680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x368c4c20d30697b74a13312968512fac08a398871a04c6f24c5f404a84c62ad7. 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/USX761801216.
Gluck, Haydn, Mozart, Beethoven & Schubert: Lieder
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc218c4315b93cd11490079306e0f059033599af71c58067087c6c9431e0c576. 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/USX761580230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1adf980ef584c79d9d0af97c20d9e17edb8e1af1e61d645fafe6cf17e41d89da. 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/USX761580234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3c3fd74b670ea69d5a50e865f36fa18fab2fc43fa3725a9170755980eb1bf18. 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/GBLGL1037573.
Lieder von Schubert, Schumann, Brahms (Stereo Version)
Grace Bumbry singt Lieder von Schubert, Brahms, Wolf und Strauss (Mono Version)
Lieder von Schubert, Schumann, Brahms (Mono Version)
Wolf: Spanisches Liederbuch, Extrakte (Mono Version)
Wolf: Italienisches Liederbuch, Vol. 2 (Stereo Version)
Wolf: Italienisches Liederbuch (Mono Version)
The Art Of Irmgard Seefried - Volume 10: Wolf & Egk Lieder
Rita Streich singt Lieder von Franz Schubert (Mono Version)
Récital de lieder sur des poèmes de Goethe (Mono Version)
Kim Borg chante des lieder de Jean Sibelius (Mono Version)
The Art Of Irmgard Seefried – Volume 8: Wolf & Strauss Lieder
The Art Of Irmgard Seefried – Volume 4: Lieder
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4e31b4d30fd0e54899765bf75db67f62e3a7a4c52a0c5b581c94f08f208e0b4. 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/DEF055702600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78b3bdd1bc410f32bc484b9762d2a79e882a9c744bf9e3f165ebd672c358c368. 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/DEF055702710.
The Art Of Irmgard Seefried - Volume 9: Lieder By Wolf; Hindemith; Reger
Schubert & Brahms: Lieder (Mono Version)
Brahms: Liebeslieder-Walzer; Neue Liebeslieder-Walzer
Liebeslieder Waltzes, Op. 52: No. 1, Rede, Mädchen, allzu liebes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x292d1835e83d20ee79efaa989793ef06ef1526f4076dc0f28e4bbe00f7d3aa03. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/DEF056230101.