There is no need to create an emergency fund before investing. Because if you are not investing, then in my opinion, an emergency fund is of little importance. Invest first and then gradually build an emergency fund. Or if you have the money to create an emergency fund, then immediately create it as soon as you invest. Try to keep 3 times your disposable income in an emergency fund.
I personally think that whether you invest or not you need to have an emergency fund. Because at any moment you may fall into danger, you will need money to face the danger. It's not that only those investing in Bitcoin should have an emergency fund, everyone should have an emergency fund. Now it can be said that those who invest in risky sectors like Bitcoin, in this case emergency fund should be given more importance, you must have emergency fund. Now if you invest in Bitcoin, if you don't have an emergency fund, it will be difficult to hold the investment for long.