btmakemetafile.bittorrent(1) on Linux
The text 57514757b4de, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it. The page shows this text now.
program to generate torrent info files for bittorrent
Flags it lists
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--piece_size_pow2