Adding CashFusion background mixing & RPA one-time ECDH addresses for BCH

[CyberAshven]

Wondering if it’s possible for BCH to add CashFusion mixing in the background, similar to the StackWallet implementation, to improve user privacy in unstoppable wallet.

In addition, I suggest pairing this with RPA (Reusable Payment Addresses). This adds one-time payment ECDH-derived addresses in addition to CashFusion, further enhancing BCH user privacy better than stealth addresses RPA is similar to Silent Payments (like Cake Wallet’s implementation), but designed for reusable static addresses.

How does it work?

• Alice sends BCH to Bob’s static public key. Using ECDH, the wallet derives a one-time payment address unseen by outsiders.
• Bob wallet scans the blockchain, detects and spends from that one-time address.
• Third-party spectators only see unrelated one-time addresses. Where Bob static address never appears on-chain.

So in short:

• Alice → Bob (static address) → generates one-time payment address.
• Bob detects it using the privatekey that crosspond to the ECDH one-time address.
• Spectator C only sees random one-time addresses, not the static one.

RPA Wallet specs: https://github.com/imaginaryusername/Reusable_specs/blob/master/reusable_addresses.md