archive snapshots

[0xluk]

JoeTom: "can we export a daily snapshot of the archive for people who would like to run their own nodes? can we cryptographically mark a complete epoch somehow to unsure the archive is complete?"

luk: "I think we can add a flag(which anyone can enable or disable) to check at startup store hash of lastProcessedTick against a predefined(also configurable by env) store hash which we can publish along with latest snapshot"

Rationale

Whenever a new archiver node runner wants to spin up a new archive node, he may want to start his archive node with all the historical data already stored and this snapshot provides this data.

Open issues

• The question for who should host and where the snapshots are not clear at this point.