laravel-a1-pdf-sign

Multiple digital signatures on a single PDF, in Laravel. Each signature is appended as a new revision, so signing again never invalidates the ones before it. A1/x509 certificates, PAdES profiles, RFC 3161 timestamps, LTV and cryptographic validation. Maintained by lsnepomuceno on GitHub, where it has earned 317 stars from the community.

It's actively developed around laravel-framework, lumen, php, and is a solid reference for anyone building with these tools.