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From: Luke Dashjr <luke@dashjr.org>
To: Bitcoin Dev <bitcoin-dev@lists.linuxfoundation.org>
Date: Sun, 7 Feb 2016 09:52:31 +0000
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Subject: [bitcoin-dev] Pre-BIP Growth Soft-hardfork
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Here's a draft BIP I wrote almost a year ago. I'm going to look into revising 
and completing it soon, and would welcome any suggestions for doing so.

This hardfork BIP aims to accomplish a few important things:
- Finally deploying proper merge-mining as Satoshi suggested before he left.
- Expanding the nonce space miners can scan in-chip, avoiding expensive
  calculations on the host controller as blocks get larger.
- Provide a way to safely deploy hardforks without risking leaving old nodes
  vulnerable to attack.

https://github.com/luke-jr/bips/blob/bip-mmhf/bip-mmhf.mediawiki

Luke