Parsing lock function in transaction document
Created by: maxime4duniter
https://forum.duniter.org/t/doc-protocol-example-tx-format/3325/23
if a lock function is present > alone < in document like XHX we cant make an unlock to retrieve source...
so, duniter have to check the input transaction document to see if the output field contain a lock function like XHX (have to check CSV/CLTV) present alone without any others SIG conditions.