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SRVR:CO1NAM04HT139; x-forefront-prvs: 0359162B6D spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: multipart/alternative; boundary="_000_BLUPR0301MB200297FEF1BF16D950BCF981EED40BLUPR0301MB2002_" MIME-Version: 1.0 X-OriginatorOrg: outlook.com X-MS-Exchange-CrossTenant-originalarrivaltime: 05 Jul 2017 09:18:36.5067 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Internet X-MS-Exchange-CrossTenant-id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-Transport-CrossTenantHeadersStamped: CO1NAM04HT139 X-Spam-Status: No, score=-1.6 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,FREEMAIL_ENVFROM_END_DIGIT,FREEMAIL_FROM,HTML_MESSAGE, RCVD_IN_DNSWL_NONE,RP_MATCHES_RCVD autolearn=no version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org X-Mailman-Approved-At: Wed, 05 Jul 2017 13:20:08 +0000 Subject: [bitcoin-dev] The Nuclear Option: BIP148 + MR POWA X-BeenThere: bitcoin-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Bitcoin Protocol Discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 05 Jul 2017 09:21:42 -0000 --_000_BLUPR0301MB200297FEF1BF16D950BCF981EED40BLUPR0301MB2002_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable This idea is highly contentious as it would guarantee a viable chain of Bit= coin with SegWit activated whether BIP148 gained sufficient support or not.= I am not necessarily advocating it - just putting it out for discussion. W= hile the downside is that it could permanently split the network, the upsid= e is that it could heap additional pressure on miners to follow the BIP148 = chain and ensure a minimally disruptive upgrade. This is pure game theory. MR POWA (Mining Reactive Proof of Work Addition) is a method to introduce a= n additional proof of work to a blockchain in response to a detected mining= behaviour. In the case of BIP148, the criteria for activation could be when the softwa= re detects a non-BIP148 compliant chain that is 144 blocks (24 hours) ahead= of a BIP148 compliant chain. At this stage the software would change its consensus rules (hard fork) to = do two things: * Lower the difficulty for existing PoW method (SHA256). * Introduce a second POW method, such as Scrypt or Ethash, that is inco= mpatible with SHA256 hardware but already has an established mining industr= y for altcoins. The difficulty should be low, and blocks will initially be found much more = quickly than every 10 minutes until the difficulty adjusts. Each method wou= ld have its own difficulty. It could be a requirement that POW methods alte= rnate to neutralise attacks from the other chain. This would guarantee SegWit activation. Anybody who is already running a BI= P148 node could just as easily run a BIP148 + MR POWA node. This could not = realistically be supported by Core and would have to be implemented in a gr= assroots movement, similar to BIP148. Ideally, it would just force the miners to follow the BIP148 chain (or risk= the value of their hardware being hurt) and the code would never be activa= ted. MR POWA would mean BIP148 miners would no longer need to =93hold their= nerve=94 as they would be guaranteed a viable chain and rewarded for their= early support. Regards, John Hardy john@seebitcoin.com --_000_BLUPR0301MB200297FEF1BF16D950BCF981EED40BLUPR0301MB2002_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable

This idea is hig= hly contentious as it would guarantee a viable chain of Bitcoin with SegWit activated whether BIP148 gained suff= icient support or not. I am not necessarily advocating it - just putting it= out for discussion. While the downside is that it could permanently split = the network, the upside is that it could heap additional pressure on miners to follow the BIP148 chain and= ensure a minimally disruptive upgrade. This is pure game theory.

 

MR POWA (Mining = Reactive Proof of Work Addition) is a method to introduce an additional proof of work to a blockchain in respons= e to a detected mining behaviour.

 

In the case of B= IP148, the criteria for activation could be when the software detects a non-BIP148 compliant chain that is 144 bloc= ks (24 hours) ahead of a BIP148 compliant chain.

 

At this stage th= e software would change its consensus rules (hard fork) to do two things:

  • Lower the difficulty for existing Po= W method (SHA256).

  • Introduce a second POW method, such = as Scrypt or Ethash, that is incompatible with SHA256 hardware but already has an established mining industry for al= tcoins.

 

The difficulty s= hould be low, and blocks will initially be found much more quickly than every 10 minutes until the difficulty adju= sts. Each method would have its own difficulty. It could be a requirement t= hat POW methods alternate to neutralise attacks from the other chain.

 

This would guara= ntee SegWit activation. Anybody who is already running a BIP148 node could just as easily run a BIP148 + MR P= OWA node. This could not realistically be supported by Core and would have = to be implemented in a grassroots movement, similar to BIP148.

 

Ideally, it woul= d just force the miners to follow the BIP148 chain (or risk the value of their hardware being hurt)= and the code would never be activated. MR POWA would mean BIP148 miners wo= uld no longer need to =93hold their nerve=94 as they would be guaranteed a viable chain and rewarded for their= early support.


Regards,<= /p>


John Hardy

john@seebitcoin.= com



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