naive: return signature for pending txs as hex-encoded string
::
:- 'raw-tx'
%- pairs
- :~ ['sig' (numb sig.raw-tx)]
- ['tx' (tx:to-json tx.raw-tx)]
+ :~ ['tx' (tx:to-json tx.raw-tx)]
+ ::
+ :+ 'sig' %s
+ %- crip
+ "0x{((x-co:co (met 3 sig.raw-tx)) sig.raw-tx)}"
== ==
::
++ tx
