From: Jonas Schnelli <dev@jonasschnelli.ch>
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Date: Tue, 19 Jun 2018 17:20:34 +0200
References: <CAPg+sBhGMxXatsyCAqeboQKH8ASSFAfiXzxyXR9UrNFnah5PPw@mail.gmail.com>
	<5b6b9d44-8e6c-2799-438e-d311e221bb57@satoshilabs.com>
To: matejcik <jan.matejek@satoshilabs.com>,
	Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
In-Reply-To: <5b6b9d44-8e6c-2799-438e-d311e221bb57@satoshilabs.com>
Message-Id: <8CF4BD50-0ECE-4F96-B978-397116CD76CE@jonasschnelli.ch>
Subject: Re: [bitcoin-dev] BIP 174 thoughts
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I agree with matejcik=E2=80=99s point 1 to 3 and especially with point =
4.
The mandatory flag (or optional-flag) makes much sense to me.

> -----------
>=20
> In general, the standard is trying to be very space-conservative,
> however is that really necessary? We would argue for clarity and ease =
of
> use over space constraints. We think more straightforward approach is
> desired, although more space demanding. What are the arguments to make
> this as small as possible? If we understand correctly, this format is
> not intended for blockchain nor for persistent storage, so size =
doesn=E2=80=99t
> matter nearly as much.

I don=E2=80=99t see any reasons why space would be an issue.

HWWs probably can=E2=80=99t handle PBST natively since it is not =
optimised for
presenting various informations in a signing-verification.

A single stream-in of a PSBT through USB (or similar channel) will not =
work in
many cases since HWW come often with very restrictive RAM constraints.

Furthermore, I forget to mention in my last mail, that registering (or =
defining)
a mime-type for PSBT would probably a great usability feature.
(Send PSBT by email/messanger and with dbl-click to open feature, etc.)


/jonas

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