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[2607:f8b0:4864:20::c2f]) by gmr-mx.google.com with ESMTPS id 98e67ed59e1d1-2f70bd476a0si639336a91.1.2025.01.17.01.45.55 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 17 Jan 2025 01:45:55 -0800 (PST) Received-SPF: pass (google.com: domain of salvatore.ingala@gmail.com designates 2607:f8b0:4864:20::c2f as permitted sender) client-ip=2607:f8b0:4864:20::c2f; Received: by mail-oo1-xc2f.google.com with SMTP id 006d021491bc7-5f4cc48ab37so586968eaf.1 for ; Fri, 17 Jan 2025 01:45:55 -0800 (PST) X-Gm-Gg: ASbGncv0P1qXeweVfxAeKq1lYrtytgwD1qfFtXxRRbHz2kVUk2besQwR+F/QzO5RViu YncOBiNOlvmh5Gv+8p6B0fFAYjG+BQH/iUG4nRg== X-Received: by 2002:a05:6871:a917:b0:296:c3cf:39ed with SMTP id 586e51a60fabf-2b1c0ce70a4mr1095679fac.38.1737107155240; Fri, 17 Jan 2025 01:45:55 -0800 (PST) MIME-Version: 1.0 References: <6FDAD97F-7C5F-474B-9EE6-82092C9073C5@sprovoost.nl> In-Reply-To: <6FDAD97F-7C5F-474B-9EE6-82092C9073C5@sprovoost.nl> From: Salvatore Ingala Date: Fri, 17 Jan 2025 10:45:44 +0100 X-Gm-Features: AbW1kvZY2rJwmGt0-o3Td7vn_3OR8KFZcarpiHkiDVY-AoHyC6S_yPMWlTF2cYU Message-ID: Subject: Re: [bitcoindev] Who uses or wants to use PSBTv2 (BIP370) To: Sjors Provoost Cc: bitcoindev@googlegroups.com Content-Type: multipart/alternative; boundary="000000000000ecd277062be3c60a" X-Original-Sender: salvatore.ingala@gmail.com X-Original-Authentication-Results: gmr-mx.google.com; dkim=pass header.i=@gmail.com header.s=20230601 header.b=Cnp65VnV; spf=pass (google.com: domain of salvatore.ingala@gmail.com designates 2607:f8b0:4864:20::c2f as permitted sender) smtp.mailfrom=salvatore.ingala@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com; dara=pass header.i=@googlegroups.com Precedence: list Mailing-list: list bitcoindev@googlegroups.com; contact bitcoindev+owners@googlegroups.com List-ID: X-Google-Group-Id: 786775582512 List-Post: , List-Help: , List-Archive: , List-Unsubscribe: , X-Spam-Score: -0.5 (/) --000000000000ecd277062be3c60a Content-Type: text/plain; charset="UTF-8" Hi Sjors, The Ledger Bitcoin app uses PSBTv2 since version 2.0.0 in 2021 [0], quite possibly the first adopter - although for somewhat unusual reasons. Working with embedded devices with just a few kb of RAM, even sending the entire PSBT is not generally feasible. Therefore, the client instead sends a 'merkleized' commitment to the entire PSBT at the beginning of the signing process. This enables the device to obtain random access to the PSBT by querying the client (who provides the data - and the Merkle proof - on demand). In PsbtV0, the unsigned transaction is a binary blob, which was a huge headache because the device had to parse it while streaming it (and therefore, no RAM access to the individual transaction fields is possible). PsbtV2 fixed this by having the transaction already 'parsed' into individual fields. The companion client libraries of the Ledger Bitcoin app support both versions, and PsbtV0 is converted to PsbtV2 on the fly. Broader support would certainly be useful. Best, Salvatore Ingala [0] https://www.ledger.com/blog/bitcoin-2 -- You received this message because you are subscribed to the Google Groups "Bitcoin Development Mailing List" group. To unsubscribe from this group and stop receiving emails from it, send an email to bitcoindev+unsubscribe@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/bitcoindev/CAMhCMoGONKFok_SuZkic%2BT%3DyoWZs5eeVxtwJL6Ei%3DyysvA8rrg%40mail.gmail.com. --000000000000ecd277062be3c60a Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi=C2=A0Sjors,

The Led= ger Bitcoin app uses PSBTv2 since version 2.0.0 in 2021 [0], quite possibly= the first adopter - although for somewhat unusual reasons.

<= /div>
Working with embedded devices with just a few kb of RAM, even sen= ding the entire PSBT is not generally feasible.
Therefore, the client in= stead sends a 'merkleized' commitment to the entire PSBT at the beg= inning of the signing process.
This enables the device to obtain = random access to the PSBT by querying the client (who provides the data - a= nd the Merkle proof - on demand).

In PsbtV0, the unsigned transactio= n is a binary blob, which was a huge headache because the device had to=C2= =A0parse it while streaming it (and therefore, no RAM access to the individ= ual transaction fields is possible).
PsbtV2 fixed this by having the tra= nsaction already 'parsed' into individual fields.
<= br>
The companion client libraries of the Ledger Bitcoin app supp= ort both versions, and PsbtV0 is converted to PsbtV2 on the fly.
= Broader support would certainly be useful.

Best,
Salvatore Ingala

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