On 10/21/18 at approximately 00:00 UTC, it became clear to us that a malicious entity had attacked the LTHN blockchain. Until more information is available and we have a solution to this problem in place, we have currently paused withdrawals and deposits on exchanges. We advise that users do not mine or send coins until the issue is resolved, as we are currently planning a rollback to block 296287 at this time, and any transactions from that block forward will be erased. This block number may change slightly as we gather more information.
We are currently working on a resolution, and will let you know when we have more information on the final details.