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If you recently restarted the omnicored node software, you may see this message:

Failed to load freeze state from levelDB. It is unsafe to continue.

Then the startup fails and exits. This paper gives the official solution to the above problems and the cause analysis of the failure.

Similarly, if you use a graphical version of omnicore-qt, you may see this screen:

After clicking the [OK] button, omnicore-qt exits.

Whether you use version 0.3.1 or the latest version 0.4.0 of omnicored or omnicore-qt, the above errors are inevitable, which makes it impossible for you to use the omni node.

Solution

Formal solution: Omni officially acknowledges that this is a software bug, and the official solution is _ _ waiting for a new version _ _, but the release date of the new version has not yet been set. You can follow the official github 99th issue to keep abreast of the new version of the omni node software.

Temporary solution: the official twitter also gives a temporary solution before the release of the new version:

In a nutshell, use the-startclean option when starting omnicored. For example:

~ $omnicored-startclean

This is a time-consuming operation, depending on your machine configuration and network conditions, and may take hours or even days.

Avoid rebooting: it should be noted that this Bug only affects the startup process, so don't worry if your omni node is still running. Therefore, officials also recommend that it is best not to restart omnicored or omnicore-qt until the new version is released.

Cause analysis

If you look at omnicore.log, you will find that when omnicore parses the omni protocol during the startup process, an incorrect USDT (Asset Type: 31) freezing transaction caused the software to fail.

The question is, how did this wrong deal come about?

One possible reason is that this is a targeted forged offensive transaction, which is introduced into the omni node software through P2P connections, resulting in the startup failure of the omni node software.

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