submitblock
See https://en.bitcoin.it/wiki/BIP_0022 for full specification.
Argument #1-hexdata
Type: string, Required
Description: the hex-encoded block data to submit
Argument #2-dummy
Type: string, Optional
Default=ignored
Description: dummy value, for compatibility with BIP22. This value is ignored.
Result---(If the block was accepted)
null (json null)
Result---(Otherwise)
Type: string (hex)
Description: According to BIP22