Representatives of the Callisto was obviously wrong, because the problem with bloccano really caused . Earlier similar was already done with some coins on the algorithm Ethash. For example, victims , and others.
Source: Callisto Network Hashrate
2Miners when splitting chains Callisto
Sorry, hit the wrong chain after its division, which led to erroneous confirmation of the blocks for the sum of 167 thousand CLO, or about 800 dollars. Payments were suspended for some time, and developers 2Miners gave information to the Callisto. In the end, Callisto acknowledged the attack 51 percent, but declined to reimburse the miners. 2Miners offset 167 thousand CLO from its own funds, users of the pool have received all their due reward.
Members of the Callisto Network Team has acknowledged the problem, but ignored the loss of the miners.
According to them, the team has been for months working on preventing attacks 51 percent through testing and is audit. However, the introduction of protective functions probably delayed. And we are talking about an indefinite period of time, because references to named features in the roadmap.
Later, 12 hours after the attack the developers Callisto advised to increase the minimum number of confirmations units to 300, making the approval time increased to 75 minutes.
The Findings are disappointing: the third largest Ethash-coin is unable to resist the attacks of 51%, as well as to act effectively in such situations. The developers get 30% reward from each block that goes to the Fund.
In Addition, representatives of the team actively suppressed the problem and for some reason blamed the team 2Miners after the publicity. Because 2Miners is completely transparent pool, this behavior are the representatives believe to be impermissible.
The Reputation of the pool worth a lot more than $ 800. For the protection of miners members of the team bought 167 thousand CLO on the stock exchange and held the payments.
the Problem with Callisto may be repeated
At the moment, and Callisto pools 2Miners work correctly, the network seems stable and payments are correct. The developers have also improved pool monitoring system of the blockchain. This will help prevent making payments when the network is split.
Alas, cannot be guaranteed — for developers of Callisto have to do something. However, the most offensive is the attitude of the miners. Representatives of the project want their coin is traded on the stock exchanges and flew to the moon, but do nothing to support and protect the owners rigs.
How to prevent the 51% attack?
There are several ready-made solutions. Ethash-coins are best suited and (dPoW).
Need to mention for the collection and analysis of metrics of the blockchain, and in the case of unusual situations .