https://chainquery.com/rpc/getchaintips
getchaintips, Bitcoin Core RPC, ChainQuery.com
returns information about the highest-height block (tip) of each local block chain.
bitcoin coregetchaintipsrpc
https://developer.bitcoin.org/reference/rpc/getchaintips.html
getchaintips — Bitcoin
This site aims to provide the docs you need to understand Bitcoin and start building Bitcoin-based applications.
getchaintipsbitcoin