• the easiest one if to use Acrobat or Foxit directly in GoFAST https://gofast-docs.readthedocs.io/en/latest/docs-gofast-users/doc-gofast-utilisation-avancee.html#signature-electronique-unitaire-des-pdf (don't know why the title is in French)
• for mutiple signature at the same time you can you Xolidosign
• we plan also to connect GoFAST to Yousign in late summer (https://yousign.com/), Yousign is an european competitor to Docusign
• stamp signature directly in GoFAST (additional module) : GoFAST adds a stamp directly in the PDF (usually in a workflow)

Obliviously all those signatures mechanisms are generally used in conjunction of a GoFAST workflow process, where different actors give approval and signoff.

For Records management (which is more pre-archiving), we will produce a small documentation in the next weeks. Basically you can assign a "Duration Date" to a GoFAST category (i.e Invoice). The documents with this category will be in Read Only State. When reaching this Duration date, the document will be either deleted or transferred to a legal Record Management Systems for Long-term archiving.

Please note that to our knowledge there are no European Regulations about Legal Record Management. In the U.S it is regulated by Dept. of Defense DOD 5015.02, in France NF Z42-013 (ISO 14641-1) and the ISO 15489.

In France, the French State has developed a important Legal Record Management application, Vitam https://www.programmevitam.fr/pages/english/pres_english/

I hope this will answer your questions