Yes, you can. Well with or without a will, all your estate will be be divided to your heirs upon death, and estates are taxed. When it comes to taxation of cryptocurrencies, it is very complex in every country and there is no universal rule yet for its accounting. So unless you want your children to suffer the rough road of estates along with the emotional pain of you passing away, you should rather find an attorney who will execute your will on your behalf and who will find out how bitcoin is accounted for in your country because that is where the tax rate will be based. Either way, your heirs will still pay estate taxes because if not, transferring of your properties to them will not happen. But if you want your death to be a little bit easier and peaceful, liquifying your assets before is also an option.