Marianne Mendt (née Krupicka; born 29 September 1945) is an Austrian jazz singer and actress, best known for her participation in the 1971 Eurovision Song Contest. Early career Mendt trained as a
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 0xa42fa0187bba35307feb128789553dedaaef9c6d0b6c55aedc902180458c6c81. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e1dac326-1962-41bc-bbc8-a70c8d240f2e.json and https://artists.proofprofile.net/proofs/artist/e1dac326-1962-41bc-bbc8-a70c8d240f2e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xd7ae7000b1475da633398e1e15da7dac8d6db20bec950408b946da6b8c3b77c1. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/ATE067000030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb817c4ac0f703de9c92b7970e61740a1c1d92cc8c182ae1cfc0294a24dce83b. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ATE067000100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x232c4b6cd9b39bfa0f1cf92e64985d45788bfc745c9b4f1b3b55f6033fc8d248. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ATE067400010.
Kaisermühlenblues - Die Musik aus der legendären TV-Serie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9170605d9c4cf69e3b656854989ba244f0cbdb80bc62aa18fe8e4ae5ca4e5526. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ATP139841401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x356c3819fc312c03942e969072e65edd76cba8a089ad3ce5022e803434b076f0. 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/ATP139841406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77e02c1b647f902633e8567c0d2f35bf6b4987cbad95fa25c40445092b9d8818. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/ATP139841407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdef5c8c7e7e62154c3da26951d2bbac1b71c775cfd88c0afbf78cbd15c9bad1a. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/ATP139841411.
That's EntertainMENDT (Live aus der Stadthalle Wien / 2014)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e95a0d085209766a6a05db8a02ffdcb3b2faf0f2ca5fb5ec11820dfaea7019c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ATMK32501601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb82cecb94e89fe7507693a792783b7b9d6914aa1d093d85586a2874a56d6eaf8. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/ATMK32501604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32d0f736f903d9af7348c9b01b684d85eb689f0d80f8255fc0c8a7c629b564c3. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/DEA600000632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9800fe067e3036580b86874dc4a458ecbb41a9df83edacbc5c8707b7d055c02a. 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/DEUM71806822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6795d0c9cab39285988904745bbd051643e2b79e944323823a5c39b9a54f0786. 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/DEUM71806825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x035cc001c7491bda1dd9a1d53c2534af30d1798530b7098c29cdd5982ccfc647. 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/ATUM70801080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c56350ca35a70c759fd580cb32a621e138954e33058b03aeb405341d445b26a. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/DEA600000630.