hardware token signing service 4
https://wiki-byte.win/index.php/Why_Your_Team_Needs_a_PDF_Signing_API_for_Remote_Signing_Workflows
A hardware token signing service uses physical devices, like USB keys or smart cards, to generate digital signatures securely. Unlike software-based methods, the private key never leaves the token, making it resistant to malware or phishing. You plug in the token, enter a PIN, and the signing happens on-device, ensuring that only you can authorize sensitive transactions. It's a straightforward way to add strong authentication for documents, code, or financial operations without relying on passw…