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With more stricter ordering and resending of messages, the protocol for negotiating a new channel status can get simplified. As resending lost messages means that a started exchange can not be aborted anymore, we can already define the next revocation hash at the end of the current exchange. With a known revocation hash, the initiator can directly send signatures for the update. Also, LNPaymentProcessor and LNPaymentLogic have been made less stateful with relying on the database as single source of truth. This means that much logic has been moved into the DBHandler.
NodeKey is a wrapper around ECKey that does allow comparing the same ECKey. ECKey.equals is generally not reliable, as it also compares the createDate of the key.
When both parties send a request to update the channel concurrently, there was a problem that could have led to loss of funds. We now send a fresh revocation hash to be used for the next exchange at the beginning of the exchange (with the A message), such that in case of a conflict, we can use that unused revocation hash directly to construct the new status.
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