Silentium: silent payment wallet (new privacy oriented wallet implementing BIP352)

This is a new wallet, work in progress; treat is as an unsafe proof of concept and don't put any meaningful funds on it

I just came across this announcement on Twitter: https://twitter.com/TheSingerLouis/status/1790824126472667227

The website: https://app.silentium.dev/

GitHub for the wallet: https://github.com/louisinger/silentiumd

GitHub for the server: https://github.com/louisinger/silentium

BIP352 (Silent Payments): https://bips.dev/352/

Bitcoinops articles on Silent Payments: https://bitcoinops.org/en/topics/silent-payments/

Silent payments are a type of payment that can be made to a unique onchain address for every payment even though the receiver provided the spender with a reusable (offchain) address. This helps improve privacy.

Traditionally, a user who receives payments should generate a new Bitcoin address for every payment. This is because receiving multiple payments to the same address reveals that the same user received those payments, even if the outputs are later spent in separate transactions. This is known as address reuse.

Using a new address often requires a secure interaction between sender and receiver so that the receiver can provide a fresh address every time. However, interaction is often infeasible and in many cases undesirable.

With silent payments, a receiver can generate and publish a single silent payment address, eliminating the need for interaction. The sender then selects one or more of their chosen inputs and uses their secret key(s) together with public key of the silent payment address to derive a shared secret which is used to generate the destination.