We play on Roll20, so this might not be anywhere near as convenient IRL. For each campaign, we create a google drive that each player can at least partially access. Part of this drive is a group loot document, where treasure found and xp gained for each session is tracked. One DM just gives out the value of everything (because it's simple) while I often give a location note so when they sell it I know its value. At one point we used the document for which character kept which item, but that quickly became a long document that took forever to load.