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lightning-checkmessage -- Command to check 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 correct usage, an object with attribute *verified* will be
returned.
If *verified* is true, the signature was generated by the returned
*pubkey* for that given message. *pubkey* is the one specified as
input, or if none was specified, the known node which must have
produced this signature.
If *verified* is false, the signature is meaningless. *pubkey* may
also be returned, which is they *pubkey* (if any) for which this
signature would be valid. This is usually not useful.
AUTHOR
------
Rusty Russell <<rusty@rustcorp.com.au>> is mainly responsible.
SEE ALSO
--------
lightning-signmessage(7)
RESOURCES
---------
Main web site: <https://github.com/ElementsProject/lightning>