---
name: "gpgparticipants-prefill"
section: "1"
platform: "linux"
package: "signing-party"
version: "2.11-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/gpgparticipants-prefill"
---

# gpgparticipants-prefill(1)

insert checksum-digits in a gpgparticicpants' form

## NAME

gpgparticipants-prefill - insert checksum-digits in a gpgparticicpants' form

## SYNOPSIS

**gpgparticipants-prefill** \[*OPTIONS*\] *EMPTYLIST* *FILLEDLIST*

## DESCRIPTION

**gpgparticipants-prefill** takes a file produced by **gpgparticipants** (*EMPTYLIST*) and tries to fill in some digits into the SHA256 field such that the resulting list actually has a SHA256 checksum that starts with those digits.  In other words, it tries to produce a file that hashes to a checksum that is partially written down in the file. Whenever a match is found, a file with the digits filled in is written to *FILLEDLIST***.***DIGITS*.

## OPTIONS

- **-h**, **--help**

  Print the usage text.

- **--fastforward**

  If a match is found of some length, immediately jump to the next length.

- **--min-length** *NUM*

  Start search with given length.

- **--max-length** *NUM*

  Stop search after the given length.

- **--prefix** *PREFIX*

  Only consider hex strings starting with *PREFIX*.

## SEE ALSO

[**gpgparticipants**(1)](/gpgparticipants/1.md)

## AUTHOR

This manual page was written by Stefan Huber \<shuber@sthu.org\>.