C3N - archetype

A French government authority (cybercrime unit) deployed a smart contract on Tezos.
Below is the Michelson of the contract (see it on better call dev): 
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{
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{ { DUP ; CAR ; DIP { CDR } } ; { DUP ; CAR @newadmin ; DIP { CDR } } ; DIP { { DUP ; CAR @oldhash ; DIP { CDR @newhash } } } ; DIP { DIP { DIP { { DUP ; CAR @storedadmin ; DIP { CDR @storedhash } } } } } } ;
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SWAP ;
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{ DIP { DIP { DIP { SWAP } } } } ;
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{ DIP { DIP { SWAP } } } ;
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DIP { SWAP } ;
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{ DIP { DIP { DIP { SWAP } } } } ;
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{ DIP { DIP { SWAP ; DUP ; DIP { SWAP } } } } ;
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{
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{ COMPARE ; EQ } ;
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IF { }
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$ELSE { { UNIT ; FAILWITH } }
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} ;
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SENDER ;
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SWAP ;
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{ DIP { DIP { PUSH @admin bool false } } } ;
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ITER { DIP { DUP } ; { COMPARE ; EQ } ; SWAP ; DIP { OR @admin } } ;
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DROP ;
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{
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IF { }
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$ELSE { { UNIT ; FAILWITH } }
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} ;
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IF_NONE { }
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$ELSE { DIP { DROP } } ;
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NIL operation ;
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{ DIP { PAIR %admin %hash } ; PAIR %op }
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}
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Below is the transcription to Archetype:
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archetype c3n
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​
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/* michelson source : https://better-call.dev/main/KT1Gbu1Gm2U47Pmq9VP7ZMy3ZLKecodquAh4/script */
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​
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variable admins : list<address> = [caller]
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​
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variable hash : bytes = 0x050100000009617263686574797065
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​
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entry register (newadmins : option<list<address>> , oldhash : bytes, newhash : bytes) {
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    require {
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        r1: oldhash = hash;
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        r2: contains(admins,caller);
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    }
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    effect {
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        hash := newhash;
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        if issome(newadmins) then admins := opt_get(newadmins)
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    }
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}
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