i wonder how a proof of work scheme, a la hashcash, would work for call spam. it was originally designed to reduce email spam: https://en.wikipedia.org/wiki/Has

i wonder how a proof of work scheme, a la hashcash, would work for call spam. it was originally designed to reduce email spam: https://en.wikipedia.org/wiki/Hashcash https://en.wikipedia.org/wiki/Hashcash it could be possible to have different PoW requirements for different callers. perhaps you could require a higher PoW for an unknown caller, and no requirement for someone you know.