Some info about private networks creating, contracts deploying is stored here

Some info about block saving in Nethermind, reading bytes from db is stored here

Rust code needed to read bytes from db and create hex strings is stored here

The ability of Geth to init contract storage through genesis file was checked here

Some info about MPT organization in Nethermind is stored here

Researching the ability to get storage of contract's state at the time of the certain block here

Some comments on code creating are stored here

Some info about TreeDump and KV-pairs in the tree is stored here

Researching ability to internally migrate Nethermind's db to Geth's db is described here

Implementing BlockReward in Geth here