OP_TEMPLATEHASH #100
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OP_TEMPLATEHASH #100
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This introduces a new Script operation exclusively available in Tapscript context: OP_TEMPLATEHASH. This operation pushes the hash of the spending transaction on the stack. See BIP xx for details. This operation is introduced as replacing OP_SUCCESS187 (0xbb). Co-Authored-By: Greg Sanders <[email protected]>
Sanity check the template hash by using it to commit to the transaction that must spend an output. Malleating committed fields must lead to a consensus failure, and changing non-committed fields is fine. We also add the option to generate test vectors from this unit test.
We introduce one specialized target focused on exercising the new `GetTemplateHash()` logic introduced for OP_TEMPLATEHASH, and one broader fuzz target which exercises using OP_TEMPLATEHASH on a variety of transactions while asserting invariants.
This leverages the extensive feature_taproot.py test framework to generate coverage for the numerous scenarii and mutations exercised there. Additionally, a separate feature_templatehash.py functional test is introduced for end-to-end testing of the commit-to-next-transaction use case, which does not fit nicely into the feature_taproot.py framework (assumes input independence).
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This is a port of instagibbs#3 for inquisition.
In draft for now until we get a BIP / BINANA number. See bitcoin/bips#1974 to track progress there.