Returns an object containing various state info regarding blockchain processing.
curl --user myuser --data-binary '{"jsonrpc":"1.0","id":"1","method":"getblockchaininfo","params":[]}' -H 'content-type:text/plain;' http://127.0.0.1:8332/{
"chain": "main",
"blocks": 840000,
"headers": 840000,
"bestblockhash": "00000000000000000002a7c4...",
"difficulty": 86388558925171.02,
"time": 1713571767,
"mediantime": 1713569243,
"verificationprogress": 0.9999991,
"pruned": false
}