Christopher Allen

@ChristopherA

We are pleased to announce #LetheKit, the newest project from @BlockchainComns. It is a #DIY platform & SDK for developing sensitive crypto apps on an offline/airgapped device without WiFi, Bluetooth, or local storage, which could leak information. https://github.com/blockchainCommons/bc-lethekit

4/3/2020, 12:09:20 PM

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Christopher Allen

@ChristopherA

Without local storage, when you turn #LetheKit off it forgets any sensitive data stored in RAM. Thus the name Lethe ("lee-thee") from the mythological river of forgetfulness and oblivion. (Thank you to @eordano for suggesting the name!).

4/3/2020, 12:10:52 PM

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Christopher Allen

@ChristopherA

Led by software engineer and hardware hacker Ken Sedgwick @ksedgwic, #LetheKit leverages a ASMD51 “SparkFun Thing Plus” board with an AMD ATSAMD51J20 32-bit ARM Cortex-M4 processor, printable 3D CAD and assembly instructions & an example seedtool application.

4/3/2020, 12:12:28 PM

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Christopher Allen

@ChristopherA

The example seedtool app leverages other libraries under development at @BlockchainComns to help with #SmartCustody. It allows you to create a master cryptographic seed from dice, save or restore it from offline using #BIP39 words or shards of multiple #SLIP39 words using Shamir.

4/3/2020, 12:13:38 PM

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Christopher Allen

@ChristopherA

One of the goals of #LetheKit is that all of its functionality is completely inspectable & auditable. You can enter the same dice used for randomness into IanColeman's popular javascript tools, or our forthcoming CLI tools, and compare the results.

4/3/2020, 12:16:18 PM

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Christopher Allen

@ChristopherA

#LetheKit leverages a number of new cryptographic libraries by Blockchain Commons, including bc-shamir & bc-slip39, C implementations of the #SLIP39 shamir secret sharing standard. They currently conform to the @Trezor reference code. https://github.com/satoshilabs/slips/blob/master/slip-0039.md

4/3/2020, 12:16:53 PM

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Christopher Allen

@ChristopherA

This is a late alpha of #LetheKit v0, so it should not be used for production tasks until it has had further testing and auditing. We need your help to review the implementation & test it before we send it out for formal security review.

4/3/2020, 12:20:36 PM

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Christopher Allen

@ChristopherA

Future plans for v0 of the seedtool include #BIP32 xprv, xpub & digital asset key derivation, output of QR codes to ease input into other devices, and other useful tools for an airgapped device. Other apps might include #zkproof support.

4/3/2020, 12:21:11 PM

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Christopher Allen

@ChristopherA

Based on the reactions to #LetheKit hardware, we are considering improvements beyond v0 to include various approaches of hardening the software, making the hardware tamper evident, adding a auto-focusing camera for reading dice or QR codes, new motherboards with HSM support, etc.

4/3/2020, 12:21:32 PM

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Christopher Allen

@ChristopherA

We would like to thank our financial contributors, project sponsors, sustaining patrons, and of course our volunteers for helping @BlockchainComns to be able do these kinds of blockchain and security infrastructure projects…

4/3/2020, 12:22:00 PM

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Christopher Allen

@ChristopherA

#LetheKit Blockchain Commons Sustaining Patrons: Sean Moss-Pultz @moskovitch of https://bitmark.com & Digital Contract Design. Project Sponsors: @unchainedcap. Individual Financial Sponsors: @aantonop @gwillen Alexandre Linhares @DarioUTXO @__B__T__C__ Anonymous x4

4/3/2020, 12:22:46 PM

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Christopher Allen

@ChristopherA

Volunteers who helped with this project, either with advice, code or review include: @ksedgwic @howech @kanzure @dsp6s @WolfMcnally @pavolrusnak @MarkFriedenbach @yancyribbens @htcexodus @Appelcline

4/3/2020, 12:35:55 PM

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Christopher Allen

@ChristopherA

#LetheKit is a project by @BlockchainComns, a not-for-profit benefit organization supporting the open web. Our work is funded entirely by donations from people like you. Every donation will be spent on building open tools & technology for blockchain & security infrastructure.

4/3/2020, 12:36:37 PM

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