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For example, instead of using my laptop to run bitcoind...how can I run bitcoind on a smartphone to create a light bitcoin wallet?

I understand hashing may drain battery, but is this possible? If so how?

I read somewhere a client is considered "light" if it doesn't download the whole blockchain, but just communicates by sending headers.

Thanks.

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    There are no mobile apps that do hashing (i.e. bitcoin mining); this would be absurdly inefficient. But there is no technical obstruction to writing such an app if you really wanted to. – Nate Eldredge May 16 '14 at 2:10
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If you're looking to mine on your phone, it's literally useless. The hashing power on these devices is so low that you'd probably need a very large amount of phones (around the thousands) to reach the hashing power of a single ASIC machine.

Also, storage is an issue because a Bitcoin node needs all of the blockchain data (around 17gb as of today), so you'd need a high-end phone that has a large amount of disk space.

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