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Gordian Seed Tool 1.3 was released over the holidays, with new support for Bitcoin PSBT signing (both our airgapped QR & legacy). We’ve also added a new macOS version to our existing iOS release, so you can now protect seeds on the device of your choice. apps.apple.com/us/app/gordian

One of the most exciting new features is the ability to sign PSBTs using your stored seeds. [2/9]

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]

GitHub - BlockchainCommons/Gordian: An entire architecture focused on user agency and security.

An entire architecture focused on user agency and security. - GitHub - BlockchainCommons/Gordian: An entire architecture focused on user agency and security.

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]

We recently documented an example of how to do so with

@SparrowWallet

. [5/9]

GordianSeedTool-iOS/Integration.md at master · BlockchainCommons/GordianSeedTool-iOS

Cryptographic Seed Manager for iOS. Contribute to BlockchainCommons/GordianSeedTool-iOS development by creating an account on GitHub.

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].

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

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]

Research/bcr-2021-001-request.md at master · BlockchainCommons/Research

Blockchain Commons Research papers. Contribute to BlockchainCommons/Research development by creating an account on GitHub.

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]

Releases · BlockchainCommons/GordianSeedTool-iOS

Cryptographic Seed Manager for iOS. Contribute to BlockchainCommons/GordianSeedTool-iOS development by creating an account on GitHub.

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]