So--it leaves your wallet...
Government says: "I see your BTC has left your wallet--that's a taxable event--pay up!"
You say--"But I moved it to another wallet I own"
Government: "Great - we'll watch that wallet now and tax you if those coins move inappropriately--oh, and you owe us 1% for the Elizabeth Warren taxk"
I don't really see an alternative here--coins leave your wallet you get taxed, or you have to divulge that you own the downstream wallet...