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From: "'Victor Kolobov' via Bitcoin Development Mailing List" <bitcoindev@googlegroups.com>
Date: Sun, 4 May 2025 15:10:55 +0300
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Subject: [bitcoindev] ColliderVM protocol for computation and L2 bridges
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I would like to update you about an alternative protocol to BitVM that we
have been working on, which we call ColliderVM. It uses the same trust
assumptions as BitVM but without needing fraud proofs. By that it is
eliminating the need for a fraud-proof time window. All in all, some
additional work is needed to make this protocol practical.
Perhaps some ideas here could also be of independent interest.
Here is the link to the paper:
https://eprint.iacr.org/2025/591
(Please note that we erroneously used an incorrect estimate for BLAKE3
script size, but this will be fixed in the next version which is coming in
a few days):
We=E2=80=99ve also made a video explaining this protocol
https://starkware.co/blog/avihu-levy-bitcoin-horizons-from-op_cat-to-covena=
nts-hong-kong/
Delving Bitcoin post with more details:
https://delvingbitcoin.org/t/collidervm-protocol-for-computation-and-l2-bri=
dges/1662
--=20
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mail to bitcoindev+unsubscribe@googlegroups.com.
To view this discussion visit https://groups.google.com/d/msgid/bitcoindev/=
CAF0T6Xhf%3DQb%2BB-3nBtR1Oiyk3gOO%3Do-8jdT0cJ6fRH%3D2azQvAg%40mail.gmail.co=
m.
--000000000000267d6d06344e4762
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<div dir=3D"ltr"><span id=3D"gmail-docs-internal-guid-fa9f8eab-7fff-ca44-60=
01-41409220963c"><p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;ma=
rgin-bottom:0pt"><span style=3D"font-size:11pt;font-family:Arial,sans-serif=
;color:rgb(0,0,0);background-color:transparent;font-variant-numeric:normal;=
font-variant-east-asian:normal;font-variant-alternates:normal;vertical-alig=
n:baseline">I would like to update you about an alternative protocol to Bit=
VM that we have been working on, which we call </span><span style=3D"font-s=
ize:11pt;font-family:Arial,sans-serif;color:rgb(0,0,0);background-color:tra=
nsparent;font-weight:700;font-variant-numeric:normal;font-variant-east-asia=
n:normal;font-variant-alternates:normal;vertical-align:baseline">ColliderVM=
</span><span style=3D"font-size:11pt;font-family:Arial,sans-serif;color:rgb=
(0,0,0);background-color:transparent;font-variant-numeric:normal;font-varia=
nt-east-asian:normal;font-variant-alternates:normal;vertical-align:baseline=
">. It uses the same trust assumptions as BitVM but without needing fraud p=
roofs. By that it is eliminating the need for a fraud-proof time window. Al=
l in all, some additional work is needed to make this protocol practical.</=
span><span style=3D"font-size:11pt;font-family:Arial,sans-serif;color:rgb(0=
,0,0);background-color:transparent;font-variant-numeric:normal;font-variant=
-east-asian:normal;font-variant-alternates:normal;vertical-align:baseline">=
<br></span><span style=3D"font-size:11pt;font-family:Arial,sans-serif;color=
:rgb(0,0,0);background-color:transparent;font-variant-numeric:normal;font-v=
ariant-east-asian:normal;font-variant-alternates:normal;vertical-align:base=
line"><br></span><span style=3D"font-size:11pt;font-family:Arial,sans-serif=
;color:rgb(0,0,0);background-color:transparent;font-variant-numeric:normal;=
font-variant-east-asian:normal;font-variant-alternates:normal;vertical-alig=
n:baseline">Perhaps some ideas here could also be of independent interest.=
=C2=A0</span></p><p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;ma=
rgin-bottom:0pt"><span style=3D"font-size:11pt;font-family:Arial,sans-serif=
;color:rgb(0,0,0);background-color:transparent;font-variant-numeric:normal;=
font-variant-east-asian:normal;font-variant-alternates:normal;vertical-alig=
n:baseline"><br></span><span style=3D"font-size:11pt;font-family:Arial,sans=
-serif;color:rgb(0,0,0);background-color:transparent;font-variant-numeric:n=
ormal;font-variant-east-asian:normal;font-variant-alternates:normal;vertica=
l-align:baseline">Here is the link to the paper:=C2=A0</span></p><p dir=3D"=
ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt"><a href=3D=
"https://eprint.iacr.org/2025/591" style=3D"text-decoration-line:none"><spa=
n style=3D"font-size:11pt;font-family:Arial,sans-serif;background-color:tra=
nsparent;font-variant-numeric:normal;font-variant-east-asian:normal;font-va=
riant-alternates:normal;text-decoration-line:underline;vertical-align:basel=
ine">https://eprint.iacr.org/2025/591</span></a><span style=3D"font-size:11=
pt;font-family:Arial,sans-serif;color:rgb(0,0,0);background-color:transpare=
nt;font-variant-numeric:normal;font-variant-east-asian:normal;font-variant-=
alternates:normal;vertical-align:baseline">=C2=A0</span></p><br><p dir=3D"l=
tr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style=
=3D"font-size:11pt;font-family:Arial,sans-serif;color:rgb(0,0,0);background=
-color:transparent;font-variant-numeric:normal;font-variant-east-asian:norm=
al;font-variant-alternates:normal;vertical-align:baseline">(Please note tha=
t we erroneously used an incorrect estimate for BLAKE3 script size, but thi=
s will be fixed in the next version which is coming in a few days):</span><=
span style=3D"font-size:11pt;font-family:Arial,sans-serif;color:rgb(0,0,0);=
background-color:transparent;font-variant-numeric:normal;font-variant-east-=
asian:normal;font-variant-alternates:normal;vertical-align:baseline"><br></=
span><span style=3D"font-size:11pt;font-family:Arial,sans-serif;color:rgb(0=
,0,0);background-color:transparent;font-variant-numeric:normal;font-variant=
-east-asian:normal;font-variant-alternates:normal;vertical-align:baseline">=
<br></span><span style=3D"font-size:11pt;font-family:Arial,sans-serif;color=
:rgb(0,0,0);background-color:transparent;font-variant-numeric:normal;font-v=
ariant-east-asian:normal;font-variant-alternates:normal;vertical-align:base=
line">We=E2=80=99ve also made a video explaining this protocol</span><span =
style=3D"font-size:11pt;font-family:Arial,sans-serif;color:rgb(0,0,0);backg=
round-color:transparent;font-variant-numeric:normal;font-variant-east-asian=
:normal;font-variant-alternates:normal;vertical-align:baseline"><br></span>=
<span style=3D"font-size:11pt;font-family:Arial,sans-serif;color:rgb(0,0,0)=
;background-color:transparent;font-variant-numeric:normal;font-variant-east=
-asian:normal;font-variant-alternates:normal;vertical-align:baseline"><br><=
/span><a href=3D"https://starkware.co/blog/avihu-levy-bitcoin-horizons-from=
-op_cat-to-covenants-hong-kong/" style=3D"text-decoration-line:none"><span =
style=3D"font-size:11pt;font-family:Arial,sans-serif;background-color:trans=
parent;font-variant-numeric:normal;font-variant-east-asian:normal;font-vari=
ant-alternates:normal;text-decoration-line:underline;vertical-align:baselin=
e">https://starkware.co/blog/avihu-levy-bitcoin-horizons-from-op_cat-to-cov=
enants-hong-kong/</span><span style=3D"font-size:11pt;font-family:Arial,san=
s-serif;background-color:transparent;font-variant-numeric:normal;font-varia=
nt-east-asian:normal;font-variant-alternates:normal;text-decoration-line:un=
derline;vertical-align:baseline"><br><br></span></a></p><p dir=3D"ltr" styl=
e=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style=3D"font=
-size:11pt;font-family:Arial,sans-serif;color:rgb(0,0,0);background-color:t=
ransparent;font-weight:700;font-variant-numeric:normal;font-variant-east-as=
ian:normal;font-variant-alternates:normal;vertical-align:baseline">Delving =
Bitcoin post with more details:</span></p></span><br><a href=3D"https://del=
vingbitcoin.org/t/collidervm-protocol-for-computation-and-l2-bridges/1662">=
https://delvingbitcoin.org/t/collidervm-protocol-for-computation-and-l2-bri=
dges/1662</a><div><br></div></div>
<p></p>
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