Sebastian Feiersinger (5 May 1913, in Kirchbichl – 2 September 1984, in Nuremberg) was an Austrian operatic tenor, particularly associated with the German repertory. He studied at the Vienna Music Ac
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17de9455479a1e18315428269f9190a9cf6063a3aaa319a4b7e7d94d27288026. Chain 2 (Bitcoin): anchored in block 954659 (2026-06-21T06:14:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dda65aac-e0de-4c35-a145-4c03f0125d67.json and https://artists.proofprofile.net/proofs/artist/dda65aac-e0de-4c35-a145-4c03f0125d67.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).