[bitcoin-dev] Defending against empty or near empty blocks from malicious miner takeover?

Tom Harding tomh at thinlink.com
Sun Mar 26 21:42:51 UTC 2017

On 3/26/2017 1:22 PM, Bryan Bishop via bitcoin-dev wrote:
> On Sun, Mar 26, 2017 at 2:05 PM, Peter R via bitcoin-dev
> <bitcoin-dev at lists.linuxfoundation.org
> <mailto:bitcoin-dev at lists.linuxfoundation.org>> wrote:
>     With a tightening of the rule set, a hash power minority that has
>     not upgraded will not produce a minority branch; instead they will
>     simply have any invalid blocks they produce orphaned, serving as a
>     wake-up call to upgrade.
> False. With bip9-based soft-fork-based activation of segwit, miner
> blocks will not be orphaned unless they are intentionally
> segwit-invalid (which they currently are not). If you have told miners
> otherwise, let me know.

A reasonable miner automatically checks every transaction seen, to see
if it might be valid with his own outputs substituted.

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