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authorZmnSCPxj <ZmnSCPxj@protonmail.com>2022-04-25 05:12:10 +0000
committerbitcoindev <bitcoindev@gnusha.org>2022-04-25 05:12:17 +0000
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treeecc557dc49c81187b193112edf79e1d9c8ff7114 /91
parentabdac82e86d0c7c9d4b59c9548938fd1813d7c5d (diff)
downloadpi-bitcoindev-7f5705b63ea3788d40cb2c222db5886d2379de2f.tar.gz
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Re: [bitcoin-dev] Automatically reverting ("transitory") soft forks, e.g. for CTV
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+To: "David A. Harding" <dave@dtrt.org>,
+ Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
+From: ZmnSCPxj <ZmnSCPxj@protonmail.com>
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+Subject: Re: [bitcoin-dev] Automatically reverting ("transitory") soft forks,
+ e.g. for CTV
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+
+Good morning Dave, et al.,
+
+I have not read through *all* the mail on this thread, but have read a fair=
+ amount of it.
+
+I think the main argument *for* this particular idea is that "it allows the=
+ use of real-world non-toy funds to prove that this feature is something ac=
+tual users demand".
+
+An idea that has been percolating in my various computation systems is to u=
+se Smart Contracts Unchained to implement a variant of the Microcode idea I=
+ put forth some months ago.
+
+Briefly, define a set of "more detailed" opcodes that would allow any gener=
+al computation to be performed.
+This is the micro-opcode instruction set.
+
+Then, when a new opcode or behavior is proposed for Bitcoin SCRIPT, create =
+a new mapping from Bitcoin SCRIPT opcodes (including the new opcodes / beha=
+vior) to the micro-opcodes.
+This is a microcode.
+
+Then use Smart Contracts Unchained.
+This means that we commit to the microcode, plus the SCRIPT that uses the m=
+icrocode, and instead of sending funds to a new version of the Bitcoin SCRI=
+PT that uses the new opcode(s), send to a "(n-of-n of users) or (1-of-users=
+ and (k-of-n of federation))".
+
+This is no worse security-wise than using a federated sidechain, without re=
+quiring a complete sidechain implementation, and allows the same code (the =
+micro-opcode interpreter) to be reused across all ideas.
+It may even be worthwhile to include the micro-opcode interpreter into Bitc=
+oin Core, so that the mechanics of merging in a new opcode, that was protot=
+yped via this mechanism, is easier.
+
+The federation only needs to interpret the micro-opcode instruction set; it=
+ simply translates the (modified) Bitcoin SCRIPT opcodes to the correspondi=
+ng micro-opcodes and runs that, possibly with reasonable limits on executio=
+n time.
+Users are not required to trust a particular fixed set of k-of-n federation=
+, but may choose any k-of-n they believe is trustworthy.
+
+This idea does not require consensus at any point in time.
+It allows "real" funds to be used, thus demonstrating real demand for the s=
+upposed innovation.
+The problem is the effective erosion of security to depending on k-of-n of =
+a federation.
+
+Presumably, proponents of a new opcode or feature would run a micro-opcode =
+interpreter faithfully, so that users have a positive experience with their=
+ new opcode, and would carefully monitor and vet the micro-opcode interpret=
+ers run by other supposed proponents, on the assumption that a sub-goal of =
+such proponents would be to encourage use of the new opcode / feature.
+
+Regards,
+ZmnSCPxj
+