Update for weeks 03/08 to 17/08:
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On the firmware side, I worked further on the test for signing, which included some utilities, like using the RNG from Ledger, printing a hex number etc. I made a handler instruction for running the tests.
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On the grin-wallet and grin++ side, I worked further on PSGT, for some alternation.
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I started writing some documentation, such as the required third-party article as described here, by Ledger: Documentation requirements | Developers
Next, I will design the 2 mandatory icons, as described here: Design requirements | Developers
Then, I will work further on the firmware tests.