thumb| Hermann Leopoldi (born Hersch Kohn; 15 August 1888 – 28 June 1959) was an Austrian composer and cabaret star who survived Dachau and Buchenwald. Einzi Stolz, wife of composer Robert Stolz, rem
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 0x971993be56d2fbc5c1f1cb1785030a640288058a65b9803916be4fcbe1033531. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c518074f-1048-41a4-ab7b-6b0670eef39e.json and https://artists.proofprofile.net/proofs/artist/c518074f-1048-41a4-ab7b-6b0670eef39e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Hermann Leopoldi - Wie er singt und lacht
Unvergessener Hermann Leopoldi - Lieder und Duette mit Helly Möslein
Hermann Leopoldi - LeopOldies (Frühe Aufnahmen)
Soirée bei Tannenbaum: Das Lustigste von Hermann Leopoldi (1928 - 1937) (2019 Remaster)
Buchenwaldlied (Arr. for Tenor & Horn Quartet by Alexander Krampe)
Heimat - 500 Jahre Heimatlieder und -gedichte
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 0x235d3e7a6f48ee829e7f007911cf169a38be56521ae3350702f57941d2d9593e. 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/CHE272201127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2315f5ce7f882da16eb2d6c95baa60e44c3ec38c17161136095afccbde2e7134. 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/DEA310903860.