2018-06-26 00:44:45
The 
Hive account@nijeah account started the first power down process of -1 VESTS.
2018-06-26 00:47:06
After the start of the power down process of first -2 VESTS and then -10,000,000,000 VESTS, the power down reaches its maximum of -1,000,000,000,000 VESTS, which is currently about -492,666,183,591 STEEM Power.
2018-07-03 00:47:00
The first payout of the Power Down process breaks the blockchain because it was a negative amount which was powered down so the blockchain didn't know how to handle it. There were any blocks produced at this point.
So far the problem has been solved and everything is running smoothly again. Witness Nodes updated to version 0.19.5, which solves the problem.
https://github.com/steemit/steem/releases/tag/v0.19.5
This is a brief description of what happened. You can read more posts on this topic by @jerc33, @bobinson, @holger80, @ironshield and even @steemitblog.
But there was an interesting point @isnochys' that caught my attention. It draws a connection between 
Hive account@netuoso and Hive account@nijeah. Both sent SBD to the same bittrex address.
So the question is, who is this guy, Hive account@nijeah?
[…]
This points to Hive account@netuoso
His answer says that he is not involved in this issue but his support for the user may have helped him to do this:
I do not own or run the Hive account@nijeah account. Several months back I helped the user with a couple scripts and answered a few questions on discord. I was compensated for my time.
[…]
They did contain automated vesting withdrawals so could be related.
So one question remains: Who is Hive account@nijeah ?
The account was created by 
Hive account@anonsteem on 2017-12-27 23:07:12. Since there is no STEEM transaction, it was created either with payment in LTC or in BTC. I don't see any possibility to get further information about the account holder here.
After creation, the account plagiarized 
Hive account@haejin's contributions and was caught five times by Steemcleaners.
1, 2, 3, 4, 5
Since January 8, 2018, the account was inactive until it began to power down a negative amount.
As mentioned above they both transferred SBD to the same bittrex address. Hive account@netuoso's answer seems reasonable, but the question why Hive account@nijeah didn't send SBD directly makes it suspicious.
So I dug into Hive account@nijeah to find any evidence that keeps the account. Pretty quickly I went over to do some research on the accounts Hive account@nijeah delegates to. These accounts are 
Hive account@grumpydog and 
Hive account@wewt.
Hive account@grumpydog is not very interesting. It was created by Hive account@nijeah and just upvoted Hive account@nijeah. So there is Hive account@wewt left.
Hive account@wewt was created by 
Hive account@msp3k [1] and Hive account@msp3k was created by Hive account@netuoso [2]. Both accounts set Hive account@netuoso as proxy [3] , [4].
There are already two connections between Hive account@netuoso and Hive account@wewt, the creator and the witness voting.
Also the upvoting scheme shows a clear picture:
Around 38.5% of all Upvotes went to Hive account@netuoso.
The last connection I found between Hive account@wewt and Hive account@netuoso was that Hive account@wewt set Hive account@netuoso as withdraw vesting route [5]. This means that when Hive account@wewt powers down VESTS, they automatically end up in the Hive account@netuoso account. You won't need to set this for every power down process manually.
When I completed all the research on Hive account@wewt, I have some pretty hard evidence that this account belongs to Hive account@netuoso. And the account, most likely operated by Hive account@netuoso, has a delegation from Hive account@nijeah that broke the blockchain yesterday.
I contacted Hive account@netuoso on Discord and asked him a few questions but I didn't get an answer yet. As soon as I get an answer I will edit it into this post afterwards. Or maybe he wants to make a statement in the comments? I would also appreciate this way.
To make it clear. I don't want accuse Hive account@netuoso of crashing the blockchain but there are interesting relations between the two accounts which I investigated here. To put it into the words of 
Hive account@isnochys:
We don't have a smoking gun here, but at least a gun with maybe fingerprints on it.
Hive account@netuoso wrote an open letter in which he denies any owner ship of Hive account@nijeah.
https://steemit.com/drama/@netuoso/open-letter-to-the-harassers-and-anyone-else-paying-attention-re-blockchain-freeze
Image source: https://pixabay.com/de/hacker-cyber-kriminalit%C3%A4t-internet-2300772/
PS: On all 61 open Discord Server related to Steemit I joined, there is nowhere an account named Hive account@nijeah. But Hive account@netuoso got in contact with him on Discord…
