I really loved to have some kind of private blockchain. it could be based on existing crypto-money but not interconnected to.
I do not plan to pay with, only to exchange some signed order among some partners. The basic part of the blockchain is enought for me, but has you said there is no such "blockchain". So my guess is that I may rely on some private use of ethereum or other project like hyperledger, but there is no Perl support for these.
By the way thanks for your constructive reply, it helps much more than other flat comment about how long I have been not posting or were else I did ask for informations.