The submitblock RPC attempts to submit new block to network.
submitblock "hexdata" ( "dummy" )
*bitcoin-cli help submitblock
submitblock "hexdata" ( "dummy" ) Attempts to submit new block to network. See https://en.bitcoin.it/wiki/BIP_0022 for full specification. Arguments: 1. hexdata (string, required) the hex-encoded block data to submit 2. dummy (string, optional, default=ignored) dummy value, for compatibility with BIP22. This value is ignored. Result (If the block was accepted): null (json null) Result (Otherwise): "str" (string) According to BIP22 Examples: > bitcoin-cli submitblock "mydata" > curl --user myusername --data-binary '{"jsonrpc": "1.0", "id": "curltest", "method": "submitblock", "params": ["mydata"]}' -H 'content-type: text/plain;' http://127.0.0.1:8332/