And while a hash of each message gets written to the chain to prove it was written, the message itself does not, so you can erase it from pow anytime you want.
The beauty of posting on pow is that every post costs a bit of eCash to help separate the signal from the noise.
> the message itself does not, so you can erase it from pow anytime you want. Right, that's a real distinction. The hash proves a message existed at a given time; it doesn't preserve the message. If the only copy sits off-chain, whoever controls that copy can delete it, and the…