Using packs

Can I open a pack myself?

Yes. A text editor shows its cards and links, standard tools check its seal, and Cintilé’s Rust library opens, checks, writes, combines and compares packs.

Opening a pack in a program

Cintilé has a library for Rust, a programming language. A library is ready-made code that programmers build on.

It opens and checks packs, reads their lines, writes new packs, and combines and compares them.

A test set of 111 checks, each with a known right answer, tests Cintilé’s library against the pack rules. On October 2, 2026, the library passed all 111 checks of version 1 of the set.

Checking a seal without the library

A programmer can check a pack’s seal with a few standard tools on Linux, a free system many computers run. The developer pages show each step and the result to expect.

How developers check a seal

Reading one by eye

The first line and the middle of a pack are plain text. A text editor shows the cover line, the cards and the links.

The end of the file is not text, so that part looks scrambled. Reading by eye does not check the seal.