Support Bitcoin Cash (BCH)

Please add support for Bitcoin Cash in your wallet.

• It has enough compatibility with BTC, that implementing support wouldn't be massive (relatively speaking).
• It also has some standardized privacy-improving features that BTC does not have (fitting for Proton).
• It also has intentionally cheaper transaction fees (due to the community spirit of Bitcoin Cash of continuing the original Bitcoin goal of being a "A Peer-to-Peer Electronic Cash System")
• Finally, it has relatively wide support as a Crypto Currency payment method.