[Bitcoin-development] New attack identified and potential solution described: Dropped-transaction spam attack against the block size limit

Peter Todd pete at petertodd.org
Mon Jun 8 22:28:16 UTC 2015

On Mon, Jun 08, 2015 at 06:06:00PM -0400, Bob McElrath wrote:
> There was this wonderful technology invented a few years ago to deal with spam. It's called Hashcash. All these hacky heuristics like block size are just dancing around the problem, and the natural solution is already present in bitcoin: smaller blocks, (down to the point of individual transactions) each mined. Don't relay things that haven't been mined. As spam or transaction levels go up, mining targets for submission go up too.

You know, you can think of Bitcoin as a system that maintains a ledger
for transferrable hashcash... Which means transaction fees *are* paid in

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