In theory it does not belong to an exchange unless the exchange purchased the coins. It might however be an account created in the exchange wallet by a user of the exchange. The answer to your question is in the taint analysis. Chainz is one of the best block explorers out there and provides lots of rich information for chain analysis. When coins move it leaves traces of information that can be analyzed. When coins are withdrawn from an exchange they do not necessarily come from the public key that the particular user created on the exchange. Coins during exchange withdrawals come from random public keys in the exchange wallet. This means that one withdrawal could come from multiple exchange accounts debited simultaneously. Interpretation of this means that the only way that accounts can be withdrawn from multiple accounts simultaneously is when all those accounts' private keys are controlled by the same entity. Over time all these traces can be put together and a picture starts to emerge of entities that control certain groups of accounts.
In this case if you go to the
largest wallets tab you will see that the largest wallet according to taint analysis consist of 12 addresses with coins in them and 466 with zero balances. One entity therefore controls the private keys of 12 stocked accounts. This can be due to 2 reasons: Option 1) More often than not it is safe to say that a very lob-sided number of accounts in contrast to the others are addresses on an exchange. The address you mention forms part of the taint analysis of the 12 and my guess would be with this option that someone has stored 17.7m on an exchange to reduce admin later or to be able to move fast on a rainy day. Option 2) There might have been a skew initial coin distribution coupled with some creative accounting and sloppy coin movements by an individual. What does bother me in this case is that exchange account movements are normally more random but these accounts seem to have been moving through many accounts with more round numbers and blocks of thousands, which is not typical of an exchange. It could therefore be under this option that the top wallet is owned by one individual.
The way to find out which option it is, is easy. Each person that has an exchange account must look through the list of accounts linked to the large wallet and if you find it there, then the large wallet is an exchange account. If no-one can find his/her exchange account in the list, then it is an individual's account.
I think the wallet
https://chainz.cryptoid.info/vidz/address.dws?13987.htm is on Exchange because if it is compared with the second of rich list
https://chainz.cryptoid.info/vidz/address.dws?5269.htm you will notice that the first is not POS while the second yes.
The first wallet does not produce POS while the second yes. You can see this from transaction +1.0vidz produced by the POS.
But it is also possible that the first wallet was blocked POS.
Another strange thing is that the first wallet has all net transactions type +2,000 +1,000 + 700 and this is not the classic deposit on an exchange.
If someone has accumulated 17.7Mil of VIDZ is why want to do something big.