# BTCAmount Single Bitcoin amount type. Stores satoshis, decodes/encodes BTC decimal. ``` struct BTCAmount ``` ## Overview Fields in sat-denominated Core JSON use plain `Int64` instead. Negative amounts are valid and expected (e.g., `fee` in wallet transactions). ```swift let amount = BTCAmount(satoshis: 100_000_000) // 1 BTC print(amount.btc) // 1 print(amount) // "1 BTC" let fee = BTCAmount(btc: Decimal(string: "0.0001")!) print(fee.satoshis) // 10000 ``` > Note: Targets Bitcoin Core v31.x.