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 0x96b9f6c846e9242b7e311dcaa695efa35be5bb64d3ee2aa977374d6236e90c2b. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d87c02d4-b456-4031-9ff8-c3bef20f35b3.json and https://artists.proofprofile.net/proofs/artist/d87c02d4-b456-4031-9ff8-c3bef20f35b3.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Mord und Mandelbaiser [Thekla, Hilde, Wally ermitteln, Fall 1 (Ungekürzt)]
Mord mit Streusel [Thekla, Hilde, Wally ermitteln, Fall 2 (Ungekürzt)]
Mord mit Marzipan [Thekla, Hilde, Wally ermitteln, Fall 3 (Ungekürzt)]
Mord und Mandelbaiser (Thekla, Hilde & Wally ermitteln, Fall 1)
Die große Thekla, Hilde & Wally Box - Mord und Mandelbaiser, Mord mit Streusel, Mord mit Marzipan [Thekla, Hilde, Wally (Ungekürzt)]
Mord mit Streusel (Thekla, Hilde & Wally emitteln, Fall 2)
Mord mit Marzipan (Thekla, Hilde & Wally ermitteln, Fall 3)