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To run a node, you need at least 1000 waves

more info: https://wavesplatform.com/mining

From what I understand you can run a full node and have other people lease their waves to you. I read on the site:"Leased proof-of-stake (LPoS) allows Waves holders to profit by using their balances to secure the network — whilst retaining full control of their funds."
I saw this interesting question on reddit which is related:
https://www.reddit.com/r/Wavesplatform/comments/92tbkp/wave_full_node/

Yeah, and waves world is doing this lease, It is more profitable to lease your 1k waves than to start your own node for only 1kwaves

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