I am worried about how you are operating this bounty. E2e encryption is not an easy thing to get right (in the context of leaking metadata), the implementation is in open discussion, there are always tradeoffs and so getting people to rush to be first instead of working to get it right is worrying.
If you just wanted e2e encryption, pay nostr:npub1a8jzweysxa9qmtmht874736aalm0lwdsl306nrys9d05ktlrhw3qcr5pj4 for his original nip.