• Use JBETHProjectPayer as starting point

• Add an extra layer of privacy via big number: -- contributions are sent to empty addresses -- these addresses are the deterministic addresses using create2 from a factory -- create2 salt is the sender address, a nonce (to use multiple addresses, if wanted), the projecId to fund -- deployer is a project payer factory -- this project payer takes the address balance and contribute to the juicebox project

• the payer has sweep functionnalities: the sender address can retrieve any erc20 or eth in this deposit address