roller: return cryptoSuite in point as json string
:- 'keys'
%- pairs
:~ ['life' s+(json-number life.keys.net)]
- ['suite' s+(json-number suite.keys.net)]
+ ['suite' s+`@t`suite.keys.net]
['auth' (hex 32 auth.keys.net)]
['crypt' (hex 32 crypt.keys.net)]
==
