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From: Anthony Towns <aj@erisian.com.au>
To: ZmnSCPxj <ZmnSCPxj@protonmail.com>,
	Bitcoin Protocol Discussion
	<bitcoin-dev@lists.linuxfoundation.org>
Cc: "lightning-dev@lists.linuxfoundation.org"
	<lightning-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] Continuing the discussion about noinput / anyprevout
Date: Wed, 2 Oct 2019 00:45:48 +1000	[thread overview]
Message-ID: <20191001144548.hrne6mlhmof7tpkr@erisian.com.au> (raw)
In-Reply-To: <gPtVJarazpIb7PaNu3ngXLKG2U4cIBfT9lb-04tltIrxufUUP4hMr08vU8Af19My-b5UeVwwo3BYhkDrVwEu1EjS_MMW5aXOx1sVub8MCIE=@protonmail.com>

On Mon, Sep 30, 2019 at 11:28:43PM +0000, ZmnSCPxj via bitcoin-dev wrote:
> Suppose rather than `SIGHASH_NOINPUT`, we created a new opcode, `OP_CHECKSIG_WITHOUT_INPUT`.

I don't think there's any meaningful difference between making a new
opcode and making a new tapscript public key type; the difference is
just one of encoding:

   3301<key>AC   [CHECKSIG of public key type 0x01]
   32<key>B3     [CHECKSIG_WITHOUT_INPUT (replacing NOP4) of key]

> This new opcode ignores any `SIGHASH` flags, if present, on a signature,

(How sighash flags are treated can be redefined by new public key types;
if that's not obvious already)

Cheers,
aj



  parent reply	other threads:[~2019-10-01 14:45 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-30 13:23 [bitcoin-dev] Continuing the discussion about noinput / anyprevout Christian Decker
2019-09-30 16:00 ` ZmnSCPxj
2019-09-30 23:28   ` ZmnSCPxj
2019-10-01 14:26     ` Christian Decker
2019-10-01 14:45     ` Anthony Towns [this message]
2019-10-01 15:42       ` ZmnSCPxj
2019-10-01 14:20   ` Christian Decker
2019-10-01 15:35     ` ZmnSCPxj
2019-10-03  9:42       ` Christian Decker
2019-10-01 12:23 ` Chris Stewart
2019-10-01 13:31   ` [bitcoin-dev] [Lightning-dev] " ZmnSCPxj
2019-10-03 10:01     ` Christian Decker
2019-10-03  9:57   ` Christian Decker
     [not found] ` <CACJVCgJ9PL-2jTS71--tXsa=QkK+f5_ciYLwv468WUno=XXAig@mail.gmail.com>
2019-10-01 14:27   ` Ethan Heilman
2019-10-01 15:14   ` Chris Stewart
2019-10-03 10:30     ` Christian Decker
2019-10-01 15:59 ` [bitcoin-dev] " Anthony Towns
2019-10-02  2:03   ` ZmnSCPxj
2019-10-03  1:47     ` [bitcoin-dev] [Lightning-dev] " Anthony Towns
2019-10-03  3:07       ` ZmnSCPxj
2019-10-03 15:05     ` [bitcoin-dev] OP_CAT was " Ethan Heilman
2019-10-03 23:42       ` [bitcoin-dev] [Lightning-dev] " ZmnSCPxj
2019-10-04  0:48         ` Ethan Heilman
2019-10-04  5:02           ` Jeremy
2019-10-04  7:00             ` ZmnSCPxj
2019-10-04 18:33               ` Jeremy
2019-10-04 11:15             ` Peter Todd
2019-10-04 18:40               ` Jeremy
2019-10-05 15:49                 ` Peter Todd
2019-10-06  8:46                   ` ZmnSCPxj
2019-10-06  9:12                     ` Peter Todd
2019-10-06  7:02       ` Lloyd Fournier
2019-10-09 16:56       ` Andrew Poelstra
2019-10-02 15:11   ` [bitcoin-dev] " s7r
2019-10-03 11:08   ` Christian Decker
2019-10-05 10:06     ` Anthony Towns

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