- It would be cool if any rate-limiting POW was specified as bytecode ...
so nodes can plug in as many "machine-captcha" things as they please, and
solvers can choose to solve... or just say "nope too hard".

- Alternately, it would be a lot nicer if you just required people to pay a
nanobit .... that could prevent DDOS even better, and generate a revenue
stream for nodes.


On Sun, May 7, 2017 at 10:48 PM, Karl Johan Alm via bitcoin-dev <
bitcoin-dev@lists.linuxfoundation.org> wrote:

> Hello,
>
> I am proposing a new feature for rate limiting purposes where nodes
> can make and solve arbitrary PoW challenges in return for connection
> slots (to be expanded to cover e.g. bloom filters or other DoS risky
> services).
>
> The BIP currently includes two proofs of work (sha256 and
> cuckoo-cycle) which can be combined (e.g. sha256(cuckoo-cycle) or
> sha256(sha256(sha256)), etc).
>
> Link: https://github.com/kallewoof/bips/blob/pow-connection-
> slots/bip-rate-limiting-via-pow.mediawiki
>
> Feedback welcome.
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>