1
blocks.index file stores an index into the block log file.
You can find a block via number quickly in the index and the index will have the location of the block in the block log file.
1
Use /v1/chain/get_info to know the last_irreversible_block_num
1
Eossharp doesn't contain the functionality to query the NET API and is not maintained anymore... you could just call the NET API endpoints yourself, see here https://developers.eos.io/manuals/eos/latest/nodeos/plugins/net_api_plugin/api-reference/index#operation/connections
1
The chain state is correct since every block is built on the previous block.
However, you don't have the transactions prior to block 3 so you can't figure out when/how the state was changed. But the state is ok.
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