If I have WBTC on ETH network, then I use curve.fi to swap WBTC from Ethereum network to BTC network, is the swap info, btc destination address and/or other info stored in any database or even in the main ETH network?
You do know that wbtc is fake Bitcoin on public ethereum blockchain held by centralized custodian so there is nothing anonymous about that, so much that even on their website they say it is completely transparent.
Your addresses, transfers and used IP addresses are all stored on blockchain, you are just paying extra conversion fees for nothing, and if you are a merchant you must pass extra kyc for holding wbtc.
BTCB on binance chain with their bridge is probably even worse than wbtc because it is 100% centralized chain held by 20 people and CZ is having all the power to roolback and do everything he wants.
I wish to repeat until death and keep btc and usdc allways anonymous and private.
or until they freeze your accounts and you lose your coins.