Was gold stored in ingot form in the Middle Ages like in the show?

There were a variety of ways of storing gold: you’d definitely have gold ingots (since when you’re smelting the impurities of gold in the end-stage of mining, you generally pour the result into ingot molds), you’d have gold plate (because plates are easy to store and transport, but they’re also handy to serve people off of if you’re trying to impress them), and you’d have sacks of coin (bulkiest and hardest to transport, but more immediately usable whereas everything else would generally need to be melted down and then coined first).