Marsupilami is a comic book character and fictional animal species created by André Franquin. Its first appearance was in the 31 January 1952 issue of the Franco-Belgian comics magazine Spirou. Since
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 0xc95f52104fea90965781ff918a4b7d48b0a2dc79d30047e14bb0266b46354e52. Chain 2 (Bitcoin): anchored in block 953958 (2026-06-16T14:52:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2667e080-57e6-446a-9a53-994296bbac28.json and https://artists.proofprofile.net/proofs/artist/2667e080-57e6-446a-9a53-994296bbac28.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).