Analysis of the Breakthrough Listen signal of interest blc1 with a technosignature verification framework

The aim of the search for extraterrestrial intelligence (SETI) is to find technologically-capable life beyond Earth through their technosignatures. On 2019 April 29, Breakthrough Listen SETI project observed Proxima Centauri with Parkes 'Murriyang' radio telescope. These data contained a narrowband signal characteristics broadly consistent technosignature near 982 MHz ('blc1'). Here we present procedure analysis potential technosignatures, in context ubiquity human-generated interference, which apply blc1. Using this procedure, that blc1 not an technosignature, but rather electronically-drifting intermodulation product local, time-varying interferers aligned observing cadence. We dozens instances interference similar morphologies at frequencies harmonically related common clock oscillators. complex products highlight necessity detailed follow-up any signal-of-interest using such as one outlined work.