By changing only GIT_COMMITTER_NAME while keeping the commit message stable, you can mine any commit hash prefix you want (bottleneck: compute). The suggested amend command restores the original message text without adding a mined date suffix. The final mined commit must be unsigned because a signature changes the commit object and therefore the hash, but a signed HEAD is still fine: the miner ignores the existing gpgsig header and the suggested amend command uses --no-gpg-sign only for that amend, so you can keep your normal Git signing defaults unchanged. Most repos use SHA1, but it is possible to toggle SHA256. This script only works for SHA1 and will terminate if it detects that the repo is configured to use SHA256. CUDA is preferred, but actually this script has a CPU mining fallback. When targeting 7 specific digits on a base model M4 mac mini it takes less than 30 sec to CPU mine. When targeting 7 digits on an RTX 4070 ti using CUDA you instantly find the solution.
make
Create any commit, then run:
./gitminer-head(if you want 7 leading zeroes). Then just run the suggested command.
or if you want a custom commit hash prefix run
./gitminer-head 1234567
The miner picks nonce_digits automatically from the requested hex prefix
length. If you want to choose a CUDA device explicitly, pass it as the second
argument, for example:
./gitminer-head 7a11effec7 0
Other targets could be readable words, like:
/gitminer-head 0facade/gitminer-head 1decade/gitminer-head beeeeef/gitminer-head faceb00/gitminer-head caffeee