anyways my version of Silver accidentally erased himself from the timeline (some more detail here lol) and as a result, has to stay in the present-time Sol dimension/Blaze's world, otherwise he'll cease to exist. Sil-Bit (working name, bc I cannot think of a good one asjdnsak) is Silver's personal Bit. It's one of the last tethers Silver has to his old life pre-erasure, so he's extremely protective of it.
If y'all want a detailed + unhinged telling of my version of Silver's backstory + extras, check out these series of tumblr posts i made I've made a few changes since tho! the biggest being the inclusion of Gold the Tenrec—who Prof. Schlemmer also took under his wing.