Estonia has had electronic signatures since 2002. Cryptographically signed PDFs (or any files), backed by the government, free to use, and widely used by common

Estonia has had electronic signatures since 2002. Cryptographically signed PDFs (or any files), backed by the government, free to use, and widely used by common citizens. All you need is residency (an ID card) and a cheap USB reader. https://en.wikipedia.org/wiki/Digital_signature_in_Estonia https://en.wikipedia.org/wiki/Digital_signature_in_Estonia (yes, "free to use" means tax-funded, no need to point this out)