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doc: add discussion about why CAP-21 and CAP-40 are preferred over some other mechanisms #458
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What
Add discussion about why CAP-21 and CAP-40 are preferred over some other mechanisms.
Why
It's come up in discussion recently about how HASH_X signers could play a similar role to the signed payload signer introduced in CAP-40, and how preauthorization transactions could play a similar role as well. We made decisions not to use these existing mechanisms and it is worth capturing why, especially since those decisions have security implications.
Co-authored-by: Leigh McCulloch [email protected]