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Date: Thu, 26 Oct 2023 21:55:48 +0000
From: Peter Todd <pete@petertodd.org>
To: Ethan Heilman <eth3rs@gmail.com>,
Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Message-ID: <ZTrgZPwv1BlXqyWV@petertodd.org>
References: <CAEM=y+XDB7GGa5BTAWrQHqTqQHBE2VRyd7VWjEb+zCOMzRP+Lg@mail.gmail.com>
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Subject: Re: [bitcoin-dev] Proposed BIP for OP_CAT
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On Sat, Oct 21, 2023 at 01:08:03AM -0400, Ethan Heilman via bitcoin-dev wro=
te:
> OP_CAT fails if there are less than two values on the stack or if a
> concatenated value would have a combined size of greater than the
> maximum script element size of 520 Bytes.
Note that if OP_CAT immediately _succeeds_ if the combined size is >=3D 520
bytes, reverting to the behavior of OP_SUCCESSx, the maximum size can be
increased in a subsequent soft fork.
Of course, this would often require extra opcodes to validate the size of
non-const arguments. But you'd only need another five or six bytes in many
cases:
SIZE <n> LESSTHAN VERIFY
<fixed data>
CAT
--=20
https://petertodd.org 'peter'[:-1]@petertodd.org
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