Karl Terkal (7 October 1919 - 12 August 1996) was an Austrian operatic tenor, particularly associated with lyric roles of the German repertory, both opera and operetta. Born in Vienna, Terkal was wor
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 0x4b67190d691f8ad13e015d0f8c7166585546919a47fbee612c9b5c864497fd1c. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/df6ba4d2-c207-437d-8d06-3d5883e08f33.json and https://artists.proofprofile.net/proofs/artist/df6ba4d2-c207-437d-8d06-3d5883e08f33.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Paganini: Gern hab' ich die Frau'n geküsst
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 0xccc8d3e54570cfb954b181d4d50e303ffbdf8394abab0736c09d8e2f6ff26d71. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/CAM460870152.
Die Czardasfüsrstin, Act I: "Die Mädis vom Chantant"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98767258c70730a7f0cc02466020b99e4a0c89a7a358f8aa749c720e67cd27e3. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/CAM460870142.
Im weissen Rössl, Akt I: "Es muss was Wunderbares sein"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x110ca1fcca82d3ab230d557ab1972f33736ba07e21429e60c8fb403bbe84d6d9. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAM460870122.
Im weissen Rössl, Akt III: "Mein Liebeslied muss ein Walzer sein"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x816d3c9e3563dd512fec34341d0b2cf8ed80d960c6a125615b49ac1a676fc3ee. 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/CAM460870123.
Die lustige Witwe: Wie die Blumen im Lenze erblüh'n/Ballsirenenwalzer
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f1b5410ca55f570f58126e295ccfa73c4ac04413ef725bcdcfa5b192bc8d0ab. 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/CAM460870145.
Gräfin Mariza: Ich warte auf das große Wunder/Machen wir's den Schwalben nach
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06804c9f7229486dde0d4322e4cad6c3391743d789ff4dbfb71e964aa7f375ea. 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/CAM460870144.
Der Graf von Luxemburg, Act I: "Mein Ahnherr war der Graf von Luxemburg"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3446f7e1c1aa26ee500472b728bd6a9906e78279e0a4484843940d34adf2fec. 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/CAM460870150.
Der Graf von Luxemburg, Act I: "Bist Du's, lachendes Glück"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64191ae219c53011499899c8ec4e6f818deddebe30c4e83b3b8b04dc48cb741b. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/CAM460870151.