Considering helping out on the wiki to keep it updated - in particular the changed unique items need to be updated to reflect 2.6.0 changes.
Mods and base items have been updated to 2.6 values - skill progressions on some skill gem pages may need updating or some bugs need to be fixed.
Silver Coins are uncommon currency items that can be dropped by slain monsters, chests, and destructible containers. They also drop from Arcanist's Strongboxes.
In contrast to most other currency items, Silver Coins have no inherent function for item crafting or other utility. However, Navali can exchange them for prophecies or seal a prophecy to create an item from it, which then can be traded with other players.