> Silent payment is right now unusable for light mobile clients so not a solution tonreplace bip47, I don’t need a separate scanning server for SP, BIP47 is serverless I don't think silent payments requiring anything more than bip47 does. How does your Bip47 wallet identify which blocks contain payments for it? If you look into it, I suspect you'll find it is by getting information about blocks from a server, which is how SP wallets do it too > Op_return in Tx0...contains info allowing the server to verify that the fee was actually paid to a publisher If the publisher tells their fee address to the server, the op_return is not needed. Neither solution requires a static fee address >. It's an anti-spoofing mechanism. If the fee is not seen on chain then the inputs are not registered. It also allows to NOT use a static fee for address collection.