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Increases conciseness and clarity

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Co-authored-by: Vojtěch Strnad <43024885+vostrnad@users.noreply.github.com>
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Ethan Heilman 2023-12-15 10:04:36 -05:00 committed by GitHub
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@ -34,7 +34,7 @@ OP_CAT aims to expands the toolbox of the tapscript developer with a simple, mod
* Vaults <ref>M. Moser, I. Eyal, and E. G. Sirer, Bitcoin Covenants, http://fc16.ifca.ai/bitcoin/papers/MES16.pdf</ref> which are a specialized covenant that allows a user to block a malicious party who has compromised the user's secret key from stealing the funds in that output. As shown in <ref>A. Poelstra, "CAT and Schnorr Tricks II", 2021, https://www.wpsoftware.net/andrew/blog/cat-and-schnorr-tricks-ii.html</ref> OP_CAT is sufficent to build vaults in Bitcoin.
* Replicating CheckSigFromStack <ref>A. Poelstra, "CAT and Schnorr Tricks I", 2021, https://medium.com/blockstream/cat-and-schnorr-tricks-i-faf1b59bd298</ref> which would allow the creation of simple covenants and other advanced contracts without having to presign spending transactions, possibly reducing complexity and the amount of data that needs to be stored. Originally shown to work with Schnorr signatures, this result has been extended to ECDSA signatures <ref>R. Linus, "Covenants with CAT and ECDSA", 2023, https://gist.github.com/RobinLinus/9a69f5552be94d13170ec79bf34d5e85#file-covenants_cat_ecdsa-md</ref>.
The opcode OP_CAT was available in early versions of Bitcoin. However OP_CAT was removed because it enabled the construction of a script for which an evaluation could have memory usage exponential in the size of the script.
The opcode OP_CAT was available in early versions of Bitcoin. However OP_CAT was removed because it enabled the construction of a script whose evaluation could have memory usage exponential in the size of the script.
For instance a script which pushed a 1 Byte value on the stack and then repeated the opcodes OP_DUP, OP_CAT 40 times would result in a stack value whose size was greater than 1 Terabyte. This is no longer an issue because tapscript enforces a maximum stack element size of 520 Bytes.
==Specification==