Tigerz is a video game in the Petz series, developed by French studio Magic Pockets and released by Ubisoft in February 2008 for the Nintendo DS. It was released after Petz 5, and is therefore part o
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 0xbcff676bf9c035a580d87cb990cc342dddd81e5ce75135217eb3fa74ebf4f172. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a7eb08b1-6bcb-466a-8808-e0d92e381184.json and https://artists.proofprofile.net/proofs/artist/a7eb08b1-6bcb-466a-8808-e0d92e381184.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).