How do miners signal upgrade readiness? Other things?

[ZenGround0]

One consideration for a smooth upgrade process in the filecoin network is getting a read for the network's willingness and preparation for a protocol change. There is a precedent to allow miners to write arbitrary data somewhere in the block (i.e. BTC's coinbase input). This way miners can signal their readiness to upgrade. This isn't strictly necessary as everyone can vote by hard fork but it could make things easier.

Right now we don't have something like this in our block format. Should we?

[whyrusleeping]

Take a look at #178, I’ve been thinking about this a bit