If you're looking to Download Namirial Digital Sign on your Chromebook laptop Then read the following guideline.

FirmaCerta by Namirial S.p.A. provides the following features for remote signature, time stamping and signature verification: - Sign any digital document (documents, pictures, programs, data, etc..) in CAdES format - Sign PDF documents in PAdES format - Base64 signed files encoding - Document signatures verification (requires active internet connection) - Signature validity verification on CRL (requires active internet connection) - Signature validity verification using OCSP service (requires active internet connection) - Sign and Time-Stamp of digital documents (requires active internet connection) - Time-stamp of advanced electronic signatures (requires active internet connection) - Time-stamp in CAdES-T, PAdES-T and TSD formats (requires active internet connection)