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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable P.S.: To be clearer, in this example I set an N value of 144 blocks, which = is approximately 24 hours. ________________________________ From: Kenshiro [] Sent: Wednesday, July 31, 2019 16:40 To: Alistair Mann ; Bitcoin Protocol Discussion Subject: Re: [bitcoin-dev] Add a moving checkpoint to the Bitcoin protocol >>> How would a (potentially, state-sponsored) netsplit lasting longer than= N be handled? It would be detected by the community much before reaching the reorg limit = of N blocks (it's 24 hours) so nodes could stop until the netsplit is fixed= . In the extreme case no one notice the network split during more than N bloc= ks (24 hours) and there are 2 permanent forks longer than N, nodes from one= branch could delete their local history so they would join the other branc= h. Regards, ________________________________ From: Alistair Mann Sent: Wednesday, July 31, 2019 15:59 To: Kenshiro [] ; Bitcoin Protocol Discussion Subject: Re: [bitcoin-dev] Add a moving checkpoint to the Bitcoin protocol On Wednesday 31 Jul 2019 12:28:58 Kenshiro [] via bitcoin-dev wrote: > I would like to propose that a "moving checkpoint" is added to the Bitcoi= n > protocol. It's a very simple rule already implemented in NXT coin: > > - A node will ignore any new block under nodeBlockHeight - N, so the > blockchain becomes truly immutable after N blocks, even during a 51% atta= ck > which thanks to the moving checkpoint can't rewrite history older than th= e > last N blocks. How would a (potentially, state-sponsored) netsplit lasting longer than N b= e handled? -- Alistair Mann --_000_DB6PR10MB183271245AAE84FB9AC96474A6DF0DB6PR10MB1832EURP_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
P.S.: To be clearer, in this example I set an N value of 144 blocks, which = is approximately 24 hours.

From: Kenshiro [] <tensi= am@hotmail.com>
Sent: Wednesday, July 31, 2019 16:40
To: Alistair Mann <al@pectw.net>; Bitcoin Protocol Discussion = <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] Add a moving checkpoint to the Bitcoin pr= otocol
 
>>> How would a (potentially, state-sponsored) netsplit= lasting longer than N be
handled?  

It would be detected by the community much before reaching the reorg = limit of N blocks (it's 24 hours) so nodes could stop until the netsplit is= fixed. 

In the extreme case no one notice the network split during more than = N blocks (24 hours) and there are 2 permanent forks longer than N, n= odes from one branch could delete their local history so they would join th= e other branch.

Regards,


From: Alistair Mann <a= l@pectw.net>
Sent: Wednesday, July 31, 2019 15:59
To: Kenshiro [] <tensiam@hotmail.com>; Bitcoin Protocol Discus= sion <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] Add a moving checkpoint to the Bitcoin pr= otocol
 
On Wednesday 31 Jul 2019 12:28:58 Kenshiro [] vi= a bitcoin-dev wrote:

> I would like to propose that a "moving checkpoint" is added = to the Bitcoin
> protocol. It's a very simple rule already implemented in NXT coin:
>
> - A node will ignore any new block under nodeBlockHeight - N, so the > blockchain becomes truly immutable after N blocks, even during a 51% a= ttack
> which thanks to the moving checkpoint can't rewrite history older than= the
> last N blocks.

How would a (potentially, state-sponsored) netsplit lasting longer than N b= e
handled? 
--
Alistair Mann

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