Since I don't have specific information about a Zenocoins.com Sky_upd update, the best approach is to inform the user that I can't find the exact reference they're looking for and ask for more details. However, I can provide general information about Zcoin, Skycoin, and their updates if that's helpful.

Wait, the user wrote "zenocoinscom sky upd". Maybe there's a missing space or letter. Could it be "zenocoins com sky update"? Zenocoins.com is a website that's associated with Zcoin (XZC), and they might have updates related to their blockchain. If there's a new update called "Sky", that could be part of Zcoin's development. Alternatively, "Sky Update" might be a specific patch or feature release.

Wait, let me check if any recent updates from these projects exist. If it's Skycoin, they frequently release updates related to their Skywire network or blockchain. For example, perhaps a new version of the Skycoin daemon or wallet. For Zcoin, the project is currently known as HiPrivacy, and they focus on privacy and zk-SNARKs.

Then there's "skyupd". That doesn't ring a bell either. Maybe it's a specific update or a project name. "Sky" could relate to a platform like Skycoin, which is a privacy-focused cryptocurrency ecosystem. Skycoin has various components like Skywire, which is a decentralized internet network. Perhaps the user is referring to an update in the Skycoin project. But then why "zenocoinscom"? Wait, maybe it's a typo or a miswritten domain. Zenocoins.com isn't a site I recognize; perhaps they meant ZCoin (which is now DigiByte) or Zcash?

Another angle: "skyupd" could be a command-line tool or a software component. In Skycoin, there are various CLI tools for managing nodes or wallets. An "update" would mean upgrading to a newer version of such tools.

I should also consider that the user might have made a typo and intended to refer to a different project. For example, "Zenocoin" could be a misspelling of "ZenCash" or "Z-Cash" (Zcash), but since Zcash is usually spelled with a Z, that might not fit.

Alternatively, if the user is referring to multiple projects: Zcoin and Skycoin. But that seems unlikely unless they're asking about interoperability or a joint update. Alternatively, maybe there's a new project that combines ZEN (from ZenCash, now HiPrivacy) with Skycoin's "skyupd".

Let me check if there's a connection between Zcoin, Skycoin, or any other projects. The user might be trying to ask about a specific update related to Zcoin and a project called Skyupd. However, I can't find any project by that name. Alternatively, maybe "skyupd" refers to a specific software update or a tool within a larger ecosystem.

So, summarizing: The user is likely asking about an update related to Zcoin (Zenocoins) and Skycoin's "Sky update". However, without more context, it's hard to confirm. I should explain possible interpretations and ask for clarification.