I'm interested in the technical question of how you got BIP34Hash and nMinimumChainWork.
The changes were introduced here:
nMinimumChainWork: https://github.com/bitcoin/bitcoin/commit/ad20cddce2097c6561202777fccd257deb1a9810
BIP34Hash and BIP34Height: https://github.com/bitcoin/bitcoin/commit/33c90cf197223fb95f858db80d090d570d70498a
getblockchaininfo
to get the current chain work. Consequently this is the minimum chain work, as the chain work can never decrease.