[DIS] fiber-payjoin-kit: Collaborative Privacy for the Nervos Fiber Network

[knmo]

Personally, I think we’re navigating some rough waters right now. Do you want to run some benchmarks on the post-quantum implementation? Are SPHINCS+ transactions that are not covered by this privacy-enhancing solution also processed in a block at the same time? So that there is little additional computational overhead?

@ILE_LABS

asking about roadmap compatibility with collaborative channel funding.

Quantum-resistant signatures are significantly larger than classical ones, which directly impacts transaction size and fees.

• ML-DSA (Dilithium): ~2.5 KB (~40x larger)
• SPHINCS+: 8 KB – 49 KB (~125x - 760x larger)

Grouping inputs that share the same Lock Scripts, allowing multiple inputs to be verified with a single signature stored in the transaction’s Witnesses.

Edit:

• PayJoin requires both sender and receiver wallets to support the protocol.
• PayJoin is used during an actual payment.
• PayJoin involves only two parties (sender and receiver) and makes a payment transaction look normal while breaking the assumption that all inputs belong to the sender.
• read spark.money bitcoin-privacy-tools-comparison

@knmo

Has PayJoin been considered for integration into Bitcoin Light Wallet? There is a funding request for the Nervos-Fiber PayJoin integration at Nervos-Talk.

Your insights and related decisions might be of interest there. Has Peersyst looked into this or considered implementing it? Could these experiences also be helpful for Nervos-Fiber?

Have other privacy-preserving technologies been implemented? Cake Wallet Payjoin v2 is certainly a good guide for successful implementation.

@vriveraPeersyst