ryley-o

This merge conflict has me a bit 🥴 😅 Getting a bit more context with the help of @lindsgil tomorrow - should be able to get to this after many...

Agree here, should be seeded with 64 bits or else someone may be able to brute force 5-6-7 addrs, especially in the future.

also, per [this comment](https://github.com/ArtBlocks/artblocks-contracts/pull/246#pullrequestreview-1074714542), dig into https://app.codecov.io/ when setting up the CI piece and that should give us a nice lil' widget thing we can drop into the README.

With the changes in #498, this becomes less valuable thanks to hardhat fixtures being much more performant than our previous use of mocha's beforeEach. We can keep this issue though,...

@lyaunzbe - this might make sense to implement (as a follow-on PR) in our new set of minters. Cc @jakerockland

>LMK if this plan sounds good to you, and if so if you could do an initial review as an initial a sign off before I start getting into writing...

This is wonderful 🙏 Gave this a look over, and everything LGTM. Some minor nits in a follow-on #416 (Consider this my approval ✅ since I cannot approve an already-merged...

@jakerockland - would appreciate your thoughts and review on this initial implementation, before I go write a bunch of tests. diff between DAExpV2 and DAExpRefundV0: https://www.diffchecker.com/5X7KY4xK

I've added events that are emitted every time a user's receipt is updated in e17c8ae

Added functions that enable a user to claim refunds across multiple projects in a single transaction in commit b839fd0