Christopher Allen

@ChristopherA

Gordian Seed Tool is built on the Gordian Principle of resilience. It shows you how to keep your crypto-seeds safe: by storing them on a closely held device. [3/9] https://github.com/BlockchainCommons/Gordian#gordian-principles

1/3/2022, 10:14:49 AM

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Christopher Allen

@ChristopherA

But usability is also very important: you have to be able to use your seeds! That’s what Gordian Seed Tool 1.3 supports: PSBT signing with the seed never leaving your device. [4/9]

1/3/2022, 10:14:50 AM

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Christopher Allen

@ChristopherA

We recently documented an example of how to do so with @SparrowWallet. [5/9] https://github.com/BlockchainCommons/GordianSeedTool-iOS/blob/master/Docs/Integration.md#using-sparrow-as-a-transaction-coordinator

1/3/2022, 10:14:50 AM

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Christopher Allen

@ChristopherA

You let Sparrow act as a Transaction Coordinator by sending it a Cosigner Public Key. Then, when Sparrow wants to produce a transaction, it creates a PSBT that is sent as a QR Code to Seed Tool for signing [5/9].

1/3/2022, 10:14:51 AM

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Christopher Allen

@ChristopherA

Seed Tool displays the details of the PSBT, asks for your permission, signs, and then sends it back in the same way. [6/9]

1/3/2022, 10:14:52 AM

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Christopher Allen

@ChristopherA

There are two ways to conduct this exchange. Sparrow currently uses the older method of exchanging crypto-psbt URs, while we expect newer releases will use our request/response methodology. [7/9] https://github.com/BlockchainCommons/Research/blob/master/papers/bcr-2021-001-request.md

1/3/2022, 10:14:52 AM

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Christopher Allen

@ChristopherA

There’s lots more in Gordian Seed Tool 1.3 including improved camera access, output descriptors, more readable QRs, and a number of smaller bug fixes and enhancements. Take a look at our release notes. [8/9] https://github.com/BlockchainCommons/GordianSeedTool-iOS/releases

1/3/2022, 10:14:53 AM

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Christopher Allen

@ChristopherA

The monthly patronage from our @BlockchainComns Sponsors (via GitHub) makes this kind of app possible, as well as our broader efforts for wallet interoperability in the Bitcoin ecosystem with specifications & reference code. Support us today! [9/9] https://github.com/sponsors/BlockchainCommons

1/3/2022, 10:14:53 AM

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