It may not work in all countries but:
- In some countries, donations are not taxed. So donate the money to your brother (0% tax)
then your brother donate to your sister (0% tax) and finally, your sister donate to you (0% tax)
- Buy gold with cryptos, once you receive the gold bars, sell them
- Use decentralized exchanges
- Move to a country without taxes on capital gains for 6 months
- Pay the taxes in your country, because it is somewhat for your own benefits too.
This is somewhat good idea but unfortunately it won't work and based on the Capital Gains Tax Act that I have sighted I have not seen such loophole and I don't think drafters of laws, the legislative house that will pass it or the Executive that will append signature can allow such to pass all over the world. What the law says from here is something acquired by way of gift and disposed as gift so if anything is go by your analogy, its just shifting the eveul day forward because at some point you will have to either use it buy something, or convert it to fiat which in from the tax point of view, is sale and tax becomes payable.
A way I can think of is if the capital gains tax is high in your own country, convert it abroad, then issue an invoice for services to be paid in form of consultancy fee the tax rate for consultant is always lower than Capital Gains Tax with that you reduce your tax liability and if you have paid tax in the country its coming from, you enjoy double taxation relief.