https://chainquery.com/rpc/getblockhash
getblockhash, Bitcoin Core RPC, ChainQuery.com
returns the header hash of a block at the given height in the local best block chain.
bitcoin coregetblockhashrpc
https://bitcoincore.org/en/doc/29.0.0/rpc/blockchain/getblockhash/
Bitcoin Core :: getblockhash (29.0.0 RPC)
getblockhash (29.0.0 RPC)
bitcoin coregetblockhashrpc