lightning-checkmessage – Command to check if a signature is from a node

SYNOPSIS

checkmessage message zbase [pubkey]

DESCRIPTION

The checkmessage RPC command is the counterpart to signmessage: given a node id (pubkey), signature (zbase) and a message, it verifies that the signature was generated by that node for that message (more technically: by someone who knows that node’s secret).

As a special case, if pubkey is not specified, we will try every known node key (as per listnodes), and verification succeeds if it matches for any one of them. Note: this is implemented far more efficiently than trying each one, so performance is not a concern.

RETURN VALUE

On success, an object is returned, containing:

  • verified (boolean): Whether the signature was valid

If verified is true:

  • pubkey (pubkey): the pubkey parameter, or the pubkey found by looking for known nodes

If verified is false:

  • pubkey (pubkey): the pubkey (if any) which could have signed this; this is usually not useful!

AUTHOR

Rusty Russell <rusty@rustcorp.com.au> is mainly responsible.

SEE ALSO

lightning-signmessage(7)