re: Official CryptoTalk Thread

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there is a value of btc below which there is no incentive to mine. Is that true?

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Yes, but as that happens more and more miners drop off the network which reduces the mining difficulty. As mining difficulty goes down the cost to mine goes down with it as there is less hashing power on the network to compete with.

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what happens to the system when mining dries up?

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Theoretically, the network would continue simply by fees added to transactions. Realistically, Bitcoin will be effectively dead before then.