Account: StorageDescriptor<[number, SS58String], {
    balance: bigint;
    reason: Enum<{
        Consumer: undefined;
        DepositFrom: [SS58String, bigint];
        DepositHeld: bigint;
        DepositRefunded: undefined;
        Sufficient: undefined;
    }>;
    status: Enum<{
        Blocked: undefined;
        Frozen: undefined;
        Liquid: undefined;
    }>;
}, true>

The holdings of a specific account for a specific asset.