[Lightning-dev] Lightning, the death of BIP62, and Segregated Witness

Peter Todd pete at petertodd.org
Sun Nov 22 20:24:54 UTC 2015

On Thu, Nov 19, 2015 at 11:12:24AM -0800, Tadge Dryja wrote:
> I've joked that BIP62 is the "whack-a-mole" BIP in that it addresses many
> vectors for txid malleability, but maybe there are more.  And more
> importantly, it addresses 3rd party malleability.  It's not helpful in the
> context of lightning channel creation because ECDSA sigs are inherently
> malleable.  You can always re-sign the same message with a different
> k-value and get a different signature.
> The functionality that's needed is to be able to reliably spend from
> unconfirmed transactions.  Segregated witness can accomplish that, but it
> quite a large hard-fork change.  sighash_noinput can also accomplish that:

It's definitely not a hard-fork change.

In fact, I'll point out that in general it's actually pretty hard to
come up with features that absolutely must be implemented as hard fork

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