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I used to do this as I commuted on the train between school and my hometown in the early 2010s. As a way to learn and pass the time.

No access to internet so mostly hacking from memory. I could use man pages for C, but Haskell was a bit more tricky.

Sometimes I’d just end up sketching things out on paper, but eventually I could complete entire modules without looking anything up. Was always a bummer to be stuck on something that I knew could be answered online in mere seconds. Good times.


I’ve been working on offline payments.

Imagine direct p2p payments that can be performed without reception.

I got thinking about what the equivalent of digital cash would be in 2021 and have worked on it on-and-off ever since. It has an optional NFC component.

Technically what I have is good enough to ship, but I’ve been unsure of the legal footing of such a project so it’s been on ice for a while now.


Interested. Could you tell me more about it?


JPMorgan is championing their own blockchain as well.


Have to agree. The site feels bloated, slow and confusing. A great portal for random recruiters to spam my inbox. Not to mention the site itself constantly spams me multiple times a week to "foo" or "blah" or upgrade my account. Please crash. Please burn. Did we ever need a site like this?</rant>


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