Sha256 mining pools

The BCN pump and ZEC

A couple weeks back I decided to look into investment opportunities on coins still using the original cryptonight algo. The thought being, all those X3s are mining something other than monero - so what?
My criteria were, cryptonight algo and traded on polo. The list was short, exactly one coin - Bytecoin. The diff had risen 8x over the past month and the price had not risen proportionally, this made the decision easy. Bought a not- insignificant quantity of them around 60 sats and expected to hold for a while until the expected price increase to move more inline with the diff.
Today, you probably heard what happened on binance with a 32x rise in price. This was "made possible" by no blocks being mined for at least two hours. This jogged my memory on something that happened a couple years back that I'd forgotten all about. This also caused me to reasses my stance on the Z3 and whether it is good or bad for ZCash.
Leading up to the latest bitcoin halving , I was researching SHA256 coins to speculate on. At the time, I figured a lot of the SHA ASICs would move off of bitcoin and into alts after the halving took place. At the time I was trading on both polo and trex, so I wanted coins on both platforms. There were about three coins I settled on as I remember - DGB, Myriad, and CURE. Bought some of each on both exchanges.
A similar scenario unfolded with CURE as happened with BCN today There was a massive, MASSIVE, pump of CURE on Polo but price was mostly unchanged on trex. Sold my CURE on polo and initiated a transfer from trex to polo to sell the remainder. After some time, there were zero confirmations showing on trex. WTF? Searched out a block explorer for CURE and low and behold the chain was not moving. After some time, the pump was over and the chain began moving again.
There was certainly a nefarious actor on the mining side that had stalled the chain. I'm no expert on the technicals of how, but winning shares were being withheld by someone with a significant portion of that network's hashrate. Maybe someone else can chime in with the details on how this type of attack is perpetrated. Incidentally, CURE was delisted from polo a very short time later. Whether this was due to polo calling BS, or being complicit and tipping off somebody prior to the delisting announcement to get one last hoorah, the world will never know.
I also remember some talk around that time of excessive orphans happening on slushpool. It apparently ended up being an unintentional issue wherein one of the larger farms pointed at slush was withholding winning shares. This sounded very similar to what happened with CURE, but with so much more hashrate on the BTC network, others were finding winning shares to keep the chain moving.
So, how is this relevant to ZEC?
I believe the BCN attack was made possible by, and initiated with, Antminer X3s. Somebody has a lot of them and pulled this off.
I believe the CURE attack was perpetrated by a major holder of SHA256 ASICs. The CURE nethash was a drop in the bucket compared to bitcoin so it was probably a simple matter of pulling off BTC for a couple hours, attacking CURE, then returning to BTC (or whatever else they were moving at the time).
Not going to speculate on who waged these attacks, it's irrelevant. The important, common, factor is ASIC miners. I fear that the ZEC network will be vulnerable to this type of attack should action not be taken to resist ASICs. All it would take is two hours to completely trash it's reputation and the effort invested in getting it to where it is today.
Before you call me a GPU shill or ASIC fudder, consider that these things have actually happened and do your own research to refute the points being made. In either case, thank you for taking the time to read what I've written and I look forward to your feedback.
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AntMiner S9 Bitcon Asic SHA256 Miner BITMAIN

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