Thanks for doing some work on this Jonas. It's something I've been interested in for a while. I haven't had an opportunity to read the bips but I will do so soon and comment.

As far as the use cases others mentioned, connecting and SPV wallet to your full node is certainly one. It would make it easy to, say, connect the android bitcoin-wallet to your own node. I've hacked on that wallet to make it connect to my .onion node, but it's very slow border-line unusable. Basic encryption and authentication would make that viable.

Also, while bloom filtering in bitcoinj is broken, it could be fixed by just creating a single filter and filling it with 1000 addresses and persisting it to disk. The main issue is you can't restore from seed that way and would have to revert to what bitcoinj does now and blow your privacy. If you had the ability to make an encrypted connection to a trusted node just for restoring from seed, you could save your privacy during a restore.

On 03/23/2016 11:24 AM, Jonas Schnelli via bitcoin-dev wrote:

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