Some guy on the internet was getting +/- 3hz using a Arduino based feedback system for the water feed valve.

We are building a hydroelectric generation system for mining. As I understand, the frequency of the electricity generated (60hz)
might vary some, depending on how well we can regulate the valve feeding the turbine.

Is this a risk of frying the S19 miners?  

Beeminer looks perfect for us we are building out a hydroelectric generation and already have river flow to supply perpetual cool water.

How much power do I save on the S19 by removing the cooling fan?

---

Will I still need room cooling with a Beeminer system set up?

---

with Antminer S19j pro
We are budgeting 25% overclock
and 10% reduction in electrical costs from not using fans on the mining rigs

Are those reasonable assumptions?

[moderator's note: consecutive posts merged]

I don't want to enter my bitcoin core password on an online machine. 
My ethernet switch was just hacked  . Had a phantom port lit up despite no cable being connected.
Fortunately it broke my internet connection but obviously cannot trust machine that is online.
At the same time my usb keyboard was randomly type weird control characters.


so yeah I have a machine that WAS online and is up to date with the blockchain and my bitcoin-qt wallet,
but I never typed my bitcoin password on this box.
i need to extract them coins without ever going only
this is the wallet that has the weird p2sh change address

my goal is to extract these coins into electrum without ever going online.

I was pretty close to thinking it was hopeless... Thanks for the help!

Now that my bitcoin-core wallet is fully recovered can I prune the blockchain?

How can I transfer this bitcoin-core wallet into electrum-offline without going online?

armory I was able to move to electrum with the private key export
it turns out
the missing coins were still in my original bitcoin wallet which I recovered by downloading the entire blockchain

wow, that goes quickly on a new tower.
my macbook was taking weeks, the new 4 core  i3 took half a day.

so yay, i have all the coins. but i need to move to secure solution
is electrum the best modern cold storage plan?
does electrum have issues with missing change addresses?
I never want to enter my password with an online machine
i have dedicated usb keyboard/mouse fo the offline machine because I am paranoid that way


if I am generating offline spends in electrum do I need to worry about change addresses?

Yeah I am thinking to build a linux box and run tests with the entire blockchain handy.
I got pretty far on a rasberry pi but will just go full ubuntu x86
.
I am learning more and now wondering if maybe I lost a change address. Would bitcoin from 2018 have the potential to lose change addresses if I don't have the latest wallet.

I moved bitcoin from bitcoin-qt to armory in 2018.
I have bitcoin wallet.dat from the date of the transfer. It is empty.
 and I have the armory paper wallet all the coins should be in
but it is only showing 1/3 of the coins when I import into electrum

I am going the check everything in the original format with full blockchain.


Does a change address start with a "3"?

I feel an urgency to liquidate some coinz as this NFT shit feels like a top (for the global economy)

Tried this but Electrum crashed with an error:
NotImplementedError:  p2sh

Thanks!

Can I do this with addresses instead of keys to make a watching-only wallet? [online machine]

or should I do this offline in electrum and then export a watching-only wallet to confirm i still have the funds?

Fair enough I will stick to this thread.

p2sh:your_private_key_here

where do I run this command? In Armory or Electrum?
Is there a way to know which private key to run it on?  Do the 2 kinds of keys have matching suffixes?

My paper backup only show P2PKH addresess but no p2sh addreses

unfortunately when I funded the wallet coins were sent using both a p2pkh and a p2sh address

So when I export to Electrum only 1/3 the balance of the wallet is showing.  I am on a mac. I only managed to get armory working
offline on a raspberry pi.

How do I recover the missing p2sh address and coins?

is it possible to *partially* restore an armory wallet but not get all the addreses back? this seems to have happened to mi recovered from a paper backup but didn't get the paper backup 100% correct
but armory went ahead and gave me my addresses and keys
but only 1/3 of the coinz seem to be there..

could such a thing happen?

as I understand it I can search the raw drive for that with hexfiend. Is there some advantage to a different program for this?

I have Disk Drill but am not sure it is up for the tasks...

I have a bunch of drives and one of them probably has some armory and/or bitcoin in deleted space. I don't know which it sadly. 

So I am running pywallet on each drive to look for bitcoin-qt wallets/keys
and then using hexfiend to search for the armory wallet/keys. I am not even sure if the Armory wallet is encrypted or not.. It is from 2018, I am pretty sure I have the password.
But I need help choosing the ideal string(s) to search for with hexfiend.

what would be the search string for an armory wallet?

I need to search some old drive for a lost armory wallet. What should I search for?
is there a good command line way to do this?

I have manage to export my wallet from amory
I imported the private keys to electrum
now I want to create a watch only walllet (within electrum)
and offline transactions

but my imported wallet has no master public key, how do I proceed?