Marc Hosemann (born 20 August 1970 in Hamburg) is a German actor. Filmography (selection) Alles außer Mord (1996, TV) Short Sharp Shock (1998) Long Hello and Short Goodbye (1999) Investigating
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 0xec114db1bf64c99b65211bf5646150660115039d82fd80b2dc37f6f16d2e28de. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b1d366dc-7bc7-495a-b63e-76a66debc00c.json and https://artists.proofprofile.net/proofs/artist/b1d366dc-7bc7-495a-b63e-76a66debc00c.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.