192 client signing execution

A least.

HUGE PR (+1000/-100) and the review will take time.

Included

• Sequence analysis (Axel)
• Naive signature sequence execution
• Persist result to file in JSON

Still pending (reported to another story?)

• Persist evidences after completion to a file
• Check for connection security (cert) here and there
• Better error management
• Benchmarks 😄