Estonia is the world leader in digital signature usage: 99 % of residents own an ID-card, Smart-ID or Mobile-ID. All three are eIDAS-qualified (QES), so they are legally valid in all EU countries. 4b2b integrates all three signing methods: ID-card (DigiDoc4), Smart-ID (Smart-ID API), Mobile-ID (DDS API), all working with one click.
A client is on a business trip abroad and needs to sign a contract now — can they sign remotely?
Smart-ID app on the phone (iOS/Android): the client gets a PIN-entry prompt, confirms the signature, and an ASIC-E container is created in 5 seconds. Works globally, only internet is required. Valid under eIDAS QES across all EU countries.
I have old ID-card certificates — do they still work?
ID-card certificates are valid for 5 years. After expiry, certificates must be renewed at a PPA office or you switch to Smart-ID. The platform checks certificate validity before signing and warns 30 days before expiry.
My invoice needs to have a digital signature — is a regular email PDF enough?
Estonian law recognizes a DigiDoc4 container (.bdoc, .asice) as an official document. The invoice is digitally signed with the seller's ID-card, the client receives the container and can validate it even offline. EMTA accepts digitally-signed invoices as the preferred format.
The entire 4b2b ecosystem is built for the Estonian market — from e-Residency through EMTA and X-Road to ID-card / Smart-ID signatures.
