[Bitcoin-development] Proposed additional options for pruned nodes

Jeff Garzik jgarzik at bitpay.com
Tue May 12 16:05:44 UTC 2015

A general assumption is that you will have a few archive nodes with the
full blockchain, and a majority of nodes are pruned, able to serve only the
tail of the chains.

On Tue, May 12, 2015 at 8:26 AM, gabe appleton <gappleto97 at gmail.com> wrote:

> Hi,
> There's been a lot of talk in the rest of the community about how the 20MB
> step would increase storage needs, and that switching to pruned nodes
> (partially) would reduce network security. I think I may have a solution.
> There could be a hybrid option in nodes. Selecting this would do the
> following:
> Flip the --no-wallet toggle
> Select a section of the blockchain to store fully (percentage based,
> possibly on hash % sections?)
> Begin pruning all sections not included in 2
> The idea is that you can implement it similar to how a Koorde is done, in
> that the network will decide which sections it retrieves. So if the user
> prompts it to store 50% of the blockchain, it would look at its peers, and
> at their peers (if secure), and choose the least-occurring options from
> them.
> This would allow them to continue validating all transactions, and still
> store a full copy, just distributed among many nodes. It should overall
> have little impact on security (unless I'm mistaken), and it would
> significantly reduce storage needs on a node.
> It would also allow for a retroactive --max-size flag, where it will prune
> until it is at the specified size, and continue to prune over time, while
> keeping to the sections defined by the network.
> What sort of side effects or network vulnerabilities would this introduce?
> I know some said it wouldn't be Sybil resistant, but how would this be less
> so than a fully pruned node?
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Jeff Garzik
Bitcoin core developer and open source evangelist
BitPay, Inc.      https://bitpay.com/
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