[Bitcoin-segwit2x] Addressing Segwit's anyone-can-spend "issue" with the hard fork?

Christopher R. Halbersma chris at halbersma.us
Mon Jul 10 21:34:32 UTC 2017


On Mon, 2017-07-10 at 14:35 -0400, Jameson Lopp via Bitcoin-segwit2x
wrote:
> "anyone-can-spend" is not actually an issue. By the time SegWit2X's
> hard fork activates, there will be 3 months of proof of work
> accumulated on top of SegWit activation; it would be economically
> infeasible for miners to reorganize the chain to deactivate SegWit at
> that point.
> 

I think the worry is not that someone will mine separate chain from
history to re-org the main chain, but instead that sometime in the
future it will become common place to discard the witness data for
transactions over x period of time old. If, for example, 90% of the
network discards witness data 7 years old. Unspent 7 year old
transactions could be spent by a malicious miner and only fork off 10%
of the network.

CRH
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