0a93286c4ea7e69da8fb45137b7f0d60984876f31811f6123d006652f38ff2ee _rpi_ws281x.so
Full source code is available here:
https://github.com/jgarff/rpi_ws281x/
Provided version was compiled 2021-09-28 on Raspberry Pi 3B+ with fully updated Debian Stretch, from HEAD 5d0041eba608e3a52aa637122a72396d3336d91b.