Reproduce a Chia netspace estimate between two headers
A farm-sizing chart should identify the exact observation interval behind its estimated network space. Two fixed block headers make that interval reproducible.
Choose ordered endpoints
Set OLDER and NEWER to block header hashes from the same canonical history, with the earlier header first. Keep both hashes, not just their heights, alongside the result. Compare wider and shorter intervals ending at the same newer header.
req=$(jq -cn --arg old "$OLDER" --arg new "$NEWER" '{older_block_header_hash:$old,newer_block_header_hash:$new}')
chia rpc full_node get_network_space "$req"
Present the estimate with explicit units
The returned space is estimated bytes across the network. Divide by 2 to the power of 60 for EiB using a numeric type large enough for the raw integer. It does not inventory plot files or directly measure free disk capacity. Short windows can vary even when your own farm stays unchanged.