Short answer: You can’t, don’t try, don’t do it. You will get yourself in trouble especially those live in the USA and other nations that tracks of your fiat by accessing and monitoring your bank transactions. The IRS is Targeting Crypto especially hitting it harder than ever and they will continue to do so, it is helping them to fight crime and also increase tax revenue.
https://medium.com/altcoin-magazine/6-ways-to-avoid-capital-gains-tax-on-your-bitcoin-transactions-cdea03e17eb4
Medium had an article about this, and I think people should think twice before trying to find loop hole that they to lessen or avoid capital gain tax.
Gifting
Self Directed IRA
Offshore Corporation
International Life Insurance Policy
Become a Resident of Puerto Rico
Give Up US Citizenship