Gavin Andresen ea2fda46c3 Special-case the last alert for alert-key-compromised case
Hard-code a special nId=max int alert, to be broadcast if the
alert key is ever compromised. It applies to all versions, never
expires, cancels all previous alerts, and has a fixed message:
   URGENT: Alert key compromised, upgrade required

Variations are not allowed (ignored), so an attacker with
the private key cannot broadcast empty-message nId=max alerts.
2012-08-27 10:22:57 -04:00
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