eIDAS, Act on Trust Services
NCCert
PLN
Yes, electronic signatures are generally legally valid in Poland under eIDAS, Act on Trust Services and sufficient for most contract types without a form requirement. canusign uses the simple electronic signature (SES); for documents with a statutory written-form or notarial requirement it is not sufficient.
In Poland, you can digitally sign most contracts, including: Commercial contracts. Exceptions are: Notarial deeds.
The responsible authority in Poland is NCCert. They oversee compliance with legal requirements for electronic signatures.