As a side note, you should look into OSMU and the bitaxe line of miners.
I like the bitaxe. It's a cool project. I've talked with Skot who created that.
I wrote a little bit about trinket miners in a post I just did. It's a fun way to learn about the mining hardware side of things, but they are pretty expensive for what they are.
I really like though how it's all open sourced and could be a real way to develop more hardware for different applications outside of industrial scale mining.
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The Bitaxe Hex is going through finalization so should be done soon. ~2Th at 12V for about $300 (guessing a bit here from the last conversations I've read).
The bitaxe is also a great way to get into mining software as well. I've been running my own ckpool + bitcoind with my half dozen bitaxe ultras.
It also got me using testnet since I had to make sure my pool was configured properly.
I have been running lightning since the start, but the bitaxe finally made mining accessible to the plebs who don't have the capital to run a s19 etc.
Power is also a concern. I can be part of the mining network, as small as it may be, without ConEdison obliterating my wallet.
All in all, I feel like the utility of the bitaxe fundamentally undermines the label of 'trinket miner'.
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So I think in dollars per terahash and the numbers you just stated hurt me inside. I like the bitaxe as a project but that's expensive.
Today a S21 is selling for $23/th and a s9 which can run on 120v is selling for $7/th from kaboomracks with warranty and customer support.
That bitaxe is selling for $150/th
I'm not saying don't do it, but just know how much you're paying and what you're paying for before doing.
Older equipment is the way to go for people on a budget. Mining is not for everyone and not everyone needs to mine
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