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yea but at hashnest and oxbtc,they sell their hashrate based on current market price.their prices is low.You mine and take them to exchanges.@ immetal6669

Hash rates and difficulty change all the time. Do they adjust the contract accordingly...and how can you guarantee these companies will exist in the future? Like I said, I do have more BTC now than if I had used the money for mining in the beginning

yea,they do adjust,like oxbtc.but i dont think mining firms will exist for long cause mining is limited .the one that will last for long will be hashnest

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