AUTHADA sign enables customers to sign contracts using the Qualified Electronic Signature (QES) remotely or on-site. The digital signature is legally equivalent to a handwritten signature due to its secure technology. AUTHADA sign is an efficient, digital, and sustainable way to sign. It allows users to achieve a legally valid digital signature with just a few clicks. AUTHADA sign offers security, legal validity, and efficiency, allowing documents to be signed in minutes, whether customers sign at home or in a branch. The digital signature process involves starting the AUTHADA web application, holding the ID to the NFC interface of a smartphone, confirming identity by entering the PIN, and signing the document with one click. The ID data and signed documents are then transferred to the service provider. AUTHADA sign is suitable for every industry and can be used in highly regulated industries due to its high security standards. It complies with numerous regulations and laws, including the eIDAS regulation, ensuring the authenticity of identification documents and protecting customer identity with encrypted data.