3.Enable internal 'bridging' between BTC, XMR and ETH for a fee. You will be able to deposit ETH on your Whirlwind Note, change it internally to BTC and withdraw it to your on-chain address.
This would be an amazing thing to have, many users would want to use the mixer as an exchange instead, a no-KYC exchange is certainly needed by many users, not sure about the legal implications since the service will no longer be just a
BTC mixer, but rather an exchange and a mixer.
Viable, I'm not taking about the fees but rather about the goal => the Anonymity Set
Introducing a second medium to the formula will drastically increase the anonymity set, in other words, a pool of 10 mixed deposits btc/eth/xmr is better than a pool with 100 btc only deposits, just imagine how difficult it would be to trace a transaction which deposited $100 worth of
BTC, withdraw 50$ worth in
BTC today, $20 worth eth tomorrow, $25 in xmr 3 days later, donated $2 worth in
BTC, and kept $2 in the note.