Are signatures created with sproof sign legally valid?

Yes, signatures created with sproof sign are legally valid. In the EU, this is clearly regulated by law in the eIDAS Regulation. Digital signatures created with sproof sign comply with the eIDAS regulation. Specifically, a distinction is also made between advanced digital signatures and qualified digital signatures. Both can be created with sproof sign. The qualified digital signature requires a unique identification and the created signatures are equal to the handwritten signature.