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From: <jl2012@xbt.hk>
To: "'Tier Nolan'" <tier.nolan@gmail.com>
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Cc: bitcoin-dev@lists.linuxfoundation.org
Subject: Re: [bitcoin-dev] BIP CPRKV: Check private key verify
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Seems it could be done without any new opcode:
=20
Bob is trading b Bitcoins for a altcoins.
=20
1. Bob Pays D Bitcoins to
=20
IF
<now+2days> CLTV DROP <Alice PK> CHECKSIG
ELSE
HASH160 <hash secret B> EQUALVERIFY <Bob PK> CHECKSIG
ENDIF
=20
2. Alice pays a altcoins to
=20
IF
HASH160 <hash secret B> EQUALVERIFY <Alice PK> CHECKSIG
ELSE
HASH160 <hash secret A> EQUALVERIFY <Bob PK> CHECKSIG
ENDIF
=20
3. Bob pays b Bitcoins to
=20
IF
<now+1days> CLTV DROP <Bob PK> CHECKSIG
ELSE
HASH160 <hash secret A> EQUALVERIFY <Alice PK> CHECKSIG
ENDIF
=20
4. Alice claims output from step 3 and reveals secret A
=20
5. Bob claims output from step 2
=20
6. Bob claims output from step 1 and reveals secret B
=20
From: bitcoin-dev-bounces@lists.linuxfoundation.org =
[mailto:bitcoin-dev-bounces@lists.linuxfoundation.org] On Behalf Of Tier =
Nolan via bitcoin-dev
Sent: Friday, 12 February, 2016 04:05
To: Bitcoin Dev <bitcoin-dev@lists.linuxfoundation.org>
Subject: [bitcoin-dev] BIP CPRKV: Check private key verify
=20
There was some discussion on the bitcointalk forums about using CLTV for =
cross chain transfers.
Many altcoins don't support CLTV, so transfers to those coins cannot be =
made secure. =20
I created a protocol. It uses on cut and choose to allow commitments to =
publish private keys, but it is clunky and not entirely secure.
I created a BIP draft for an opcode which would allow outputs to be =
locked unless a private key was published that matches a given public =
key.
https://github.com/TierNolan/bips/blob/cpkv/bip-cprkv.mediawiki
<https://www.avast.com/sig-email>=20
This email has been sent from a virus-free computer protected by Avast.=20
<https://www.avast.com/sig-email> www.avast.com=20
=20
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style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
>Seems it could be done without any new opcode:<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
><o:p> </o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
>Bob is trading b Bitcoins for a altcoins.<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
><o:p> </o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
>1. Bob Pays D Bitcoins to<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
><o:p> </o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
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style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
><now+2days> CLTV DROP <Alice PK> =
CHECKSIG<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
>ELSE<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
>HASH160 <hash secret B> EQUALVERIFY <Bob PK> =
CHECKSIG<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
>ENDIF<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
><o:p> </o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
>2. Alice pays a altcoins to<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
><o:p> </o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
>IF<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
>HASH160 <hash secret B> EQUALVERIFY <Alice PK> =
CHECKSIG<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
>ELSE<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
>HASH160 <hash secret A> EQUALVERIFY <Bob PK> =
CHECKSIG<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
>ENDIF<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
><o:p> </o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
>3. Bob pays b Bitcoins to<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
><o:p> </o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
>IF<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
><now+1days> CLTV DROP <Bob PK> =
CHECKSIG<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
>ELSE<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
>HASH160 <hash secret A> EQUALVERIFY <Alice PK> =
CHECKSIG<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
>ENDIF<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
><o:p> </o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
>4. Alice claims output from step 3 and reveals secret =
A<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
><o:p> </o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
>5. Bob claims output from step 2<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
><o:p> </o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
>6. Bob claims output from step 1 and reveals secret =
B<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'=
><o:p> </o:p></span></p><p class=3DMsoNormal><b><span lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span><=
/b><span lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'> =
bitcoin-dev-bounces@lists.linuxfoundation.org =
[mailto:bitcoin-dev-bounces@lists.linuxfoundation.org] <b>On Behalf Of =
</b>Tier Nolan via bitcoin-dev<br><b>Sent:</b> Friday, 12 February, 2016 =
04:05<br><b>To:</b> Bitcoin Dev =
<bitcoin-dev@lists.linuxfoundation.org><br><b>Subject:</b> =
[bitcoin-dev] BIP CPRKV: Check private key =
verify<o:p></o:p></span></p><p =
class=3DMsoNormal><o:p> </o:p></p><div><div><div><div><div><p =
class=3DMsoNormal style=3D'margin-bottom:12.0pt'>There was some =
discussion on the bitcointalk forums about using CLTV for cross chain =
transfers.<o:p></o:p></p></div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>Many altcoins don't support CLTV, so =
transfers to those coins cannot be made secure. =
<o:p></o:p></p></div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>I created a protocol. It uses on =
cut and choose to allow commitments to publish private keys, but it is =
clunky and not entirely secure.<o:p></o:p></p></div></div><p =
class=3DMsoNormal>I created a BIP draft for an opcode which would allow =
outputs to be locked unless a private key was published that matches a =
given public key.<o:p></o:p></p><div><div><div><div><p =
class=3DMsoNormal><br><a =
href=3D"https://github.com/TierNolan/bips/blob/cpkv/bip-cprkv.mediawiki">=
https://github.com/TierNolan/bips/blob/cpkv/bip-cprkv.mediawiki</a><o:p><=
/o:p></p></div></div></div></div></div><div =
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