Klemens Sander (born before 1980) is an Austrian baritone. Life Education Born in Steyr, Upper Austria, Sander (married and stage name, born Klemens Geyrhofer) was first a member of the before g
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 0x2b97ba683775b7ea54b72fe003fdef7b0869a6cbe1cfa17d9902983be8951180. Chain 2 (Bitcoin): anchored in block 954717 (2026-06-21T15:47:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f31f91b3-771f-4a91-b28b-7b1ccaec4007.json and https://artists.proofprofile.net/proofs/artist/f31f91b3-771f-4a91-b28b-7b1ccaec4007.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
St. Augustin - Mozart: Messe in D / Loretomesse
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 0x07e23c5a60e560ea0cf22b21cb37db0c73bf53851233acc05198801a54c38fe2. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:29:35Z), 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/ATP131104301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x217de39f120a85043230c0616dadd925b052d1002aee53a0034d95d15aea9eb9. 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/ATP131104302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe71f6088fa5c56608b40ebb43981da6a93dc86fc27cb79066cf5e660d31ef11a. 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/ATP131104305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e1611c66e7e70f72bd36ef7df5f7a5d2fafd619391317e00c0e674b2ef3ca29. 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/ATP131104306.
Schubert: Die schöne Müllerin, Op. 25, D. 795