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+<pre>
+  BIP: TBD
+  Layer: Consensus (soft fork)
+  Title: CHECKSIGFROMSTACK
+  Author: Brandon Black <freedom@reardencode.com>
+  Comments-Summary: No comments yet.
+  Status: Draft
+  Type: Standards Track
+  Created: 2023-12-22
+  License: PD
+</pre>
+
+==Abstract==
+
+This BIP describes two new opcode for the purpose of checking cryptographic
+signatures in bitcoin scripts against data other than bitcoin transactions.
+
+==Specification==
+
+We propose replacing OP_NOP5 in bitcoin script with
+'''OP_CHECKSIGFROMSTACKVERIFY'''. When verifying taproot script spends having
+leaf version 0xc0 (as defined in BIP342), we propose '''OP_CHECKSIGFROMSTACK'''
+to replace '''OP_SUCCESS188''' (0xbc).
+
+'''OP_CHECKSIGFROMSTACK''' and '''OP_CHECKSIGFROMSTACKVERIFY''' have identical
+semantics to '''OP_CHECKSIG''' and '''OP_CHECKSIGVERIFY''' respectively,
+except:
+
+* On success the arguments to '''OP_CHECKSIGFROMSTACKVERIFY''' are left unchanged on the stack.
+* They read (or pop, respectively) 3 arguments (rather than 2) from the stack in the following order: '''<pubkey> <data> <sig>'''
+* Signatures must not have a sighash byte appended
+* The message being verified is '''<data>'''
+** '''<data>''' may be any length.
+** For ECDSA signature verification '''<data>''' is SHA256 hashed before being used as the message.
+
+==Resource Limits==
+
+These opcodes are treated identically to other signature checking opcodes and
+count against the various sigops limits in their respective script types.
+
+==Motivation==
+
+===LN Symmetry===
+
+When combined with '''OP_CHECKTEMPLATEVERIFY''' (BIP119/CTV),
+'''OP_CHECKSIGFROMSTACK''' (CSFS) can be used in Lightning Symmetry channels.
+The construction '''OP_CHECKTEMPLATEVERIFY <pubkey> OP_CHECKSIGFROMSTACK''' is
+logically equivalent to '''<bip118_pubkey> OP_CHECKSIG''' and a signature over
+'''SIGHASH_ALL|SIGHASH_ANYPREVOUTANYSCRIPT'''. The '''OP_CHECKSIGFROMSTACK'''
+construction is 8 vBytes larger.
+
+===Delegation===
+
+Using a script like:
+'''OP_DUP <pubkey> OP_CHECKSIGFROMSTACK OP_DROP OP_CHECKSIG'''
+A script can delegate signing to another key.
+
+==Reference Implementation==
+
+A reference implementation is provided in provided here:
+
+https://github.com/brandonblack/bitcoin/commit/fd57785b99442df092488135752112586597b756
+
+==Backward Compatibility==
+
+By constraining the behavior of an OP_SUCCESS opcode and an OP_NOP opcode,
+deployment of the BIP can be done in a backwards compatible, soft-fork manner.
+If anyone were to rely on the OP_SUCCESS behavior of OP_SUCCESS188,
+OP_CHECKSIGFROMSTACk would invalidate their spend.
+
+==Deployment==
+
+TBD
+
+==Credits==
+
+Reference implementation was made with reference to the implementation in
+Elements and started by moonsettler.
+
+==References==
+
+[https://github.com/bitcoin/bips/blob/master/bip-0119.mediawiki BIP 119] CHECKTEMPLATEVERIFY
+
+[https://github.com/bitcoin/bips/blob/master/bip-0341.mediawiki BIP 341] Taproot
+
+[https://github.com/bitcoin/bips/blob/master/bip-0342.mediawiki BIP 342] Tapscript
+
+==Copyright==
+
+This document is placed in the public domain.