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+From: John Hardy <john@seebitcoin.com>

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+Thread-Topic: The Nuclear Option: BIP148 + MR POWA

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+Subject: [bitcoin-dev] The Nuclear Option: BIP148 + MR POWA

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+

+--_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

+

+<html>

+<head>

+<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DWindows-1=

+252">

+<style type=3D"text/css" style=3D"display:none;"><!-- P {margin-top:0;margi=

+n-bottom:0;} --></style>

+</head>

+<body dir=3D"ltr">

+<div id=3D"divtagdefaultwrapper" style=3D"font-size:12pt;color:#000000;font=

+-family:Calibri,Helvetica,sans-serif;" dir=3D"ltr">

+<p><span id=3D"docs-internal-guid-6c0fcb17-1202-79ea-96b2-c4a2764562bd"></s=

+pan></p>

+<p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt;"=

+><span style=3D"font-size: 11pt; font-family: Arial; background-color: tran=

+sparent; vertical-align: baseline; white-space: pre-wrap;">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.</span></p=

+>

+<p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt;"=

+>&nbsp;</p>

+<p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt;"=

+><span style=3D"font-size: 11pt; font-family: Arial; background-color: tran=

+sparent; vertical-align: baseline; white-space: pre-wrap;">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.</span></p>

+<p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt;"=

+>&nbsp;</p>

+<p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt;"=

+><span style=3D"font-size: 11pt; font-family: Arial; background-color: tran=

+sparent; vertical-align: baseline; white-space: pre-wrap;">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.</span></p>

+<p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt;"=

+>&nbsp;</p>

+<p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt;"=

+><span style=3D"font-size: 11pt; font-family: Arial; background-color: tran=

+sparent; vertical-align: baseline; white-space: pre-wrap;">At this stage th=

+e software would change its consensus

+ rules (hard fork) to do two things:</span></p>

+<ul style=3D"margin-top:0pt;margin-bottom:0pt;">

+<li dir=3D"ltr" style=3D"list-style-type: disc; font-size: 11pt; font-famil=

+y: Arial; background-color: transparent; vertical-align: baseline;">

+<p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt;"=

+><span style=3D"font-size: 11pt; background-color: transparent; vertical-al=

+ign: baseline; white-space: pre-wrap;">Lower the difficulty for existing Po=

+W method (SHA256).</span></p>

+</li><li dir=3D"ltr" style=3D"list-style-type: disc; font-size: 11pt; font-=

+family: Arial; background-color: transparent; vertical-align: baseline;">

+<p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt;"=

+><span style=3D"font-size: 11pt; background-color: transparent; vertical-al=

+ign: baseline; white-space: pre-wrap;">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.</span></p>

+</li></ul>

+<p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt;"=

+>&nbsp;</p>

+<p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt;"=

+><span style=3D"font-size: 11pt; font-family: Arial; background-color: tran=

+sparent; vertical-align: baseline; white-space: pre-wrap;">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.</span=

+></p>

+<p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt;"=

+>&nbsp;</p>

+<p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt;"=

+><span style=3D"font-size: 11pt; font-family: Arial; background-color: tran=

+sparent; vertical-align: baseline; white-space: pre-wrap;">This would guara=

+ntee SegWit activation. Anybody who is

+ already running a BIP148 node could just as easily run a BIP148 &#43; 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.</span></p>

+<p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt;"=

+>&nbsp;</p>

+<p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt;"=

+><span style=3D"font-size: 11pt; font-family: Arial; background-color: tran=

+sparent; vertical-align: baseline; white-space: pre-wrap;">Ideally, it woul=

+d just force the miners to follow the

+ BIP148 chain<span style=3D"font-family: Arial; font-size: 14.6667px; white=

+-space: pre-wrap;"> (or risk the value of their hardware being hurt)</span>=

+ 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.</span></p>

+<p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt;"=

+><span style=3D"font-size: 11pt; font-family: Arial; background-color: tran=

+sparent; vertical-align: baseline; white-space: pre-wrap;"><br>

+</span></p>

+<p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt;"=

+><span style=3D"font-size: 11pt; font-family: Arial; background-color: tran=

+sparent; vertical-align: baseline; white-space: pre-wrap;">Regards,</span><=

+/p>

+<p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt;"=

+><span style=3D"font-size: 11pt; font-family: Arial; background-color: tran=

+sparent; vertical-align: baseline; white-space: pre-wrap;"><br>

+</span></p>

+<p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt;"=

+><span style=3D"font-size: 11pt; font-family: Arial; background-color: tran=

+sparent; vertical-align: baseline; white-space: pre-wrap;">John Hardy</span=

+></p>

+<p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt;"=

+><span style=3D"font-size: 11pt; font-family: Arial; background-color: tran=

+sparent; vertical-align: baseline; white-space: pre-wrap;">john@seebitcoin.=

+com</span></p>

+<div><span style=3D"font-size: 11pt; font-family: Arial; background-color: =

+transparent; vertical-align: baseline; white-space: pre-wrap;"><br>

+</span></div>

+<br>

+<p></p>

+</div>

+</body>

+</html>

+

+--_000_BLUPR0301MB200297FEF1BF16D950BCF981EED40BLUPR0301MB2002_--

+