I just finished a quick post about using Protobuf(protocol buffers) with exprotobuf.
ChaseGilliam
dcaixinha
Hey guys, just published the (long overdue) second part of my blog post about testing: https://medium.com/onfido-tech/the-not-so-magic-tricks-of-testing-in-elixir-2-2-acdd0368572b
Feedback is, as always, welcome 
petecorey
I spent a little time this week diving into property testing. I used StreamData to property test a Base58Check encoder (that we built in a previous article) against an external, command line oracle. StreamData made the whole process amazingly simple, and I can definitely see myself using property testing much more in the future.
blackode
10 Elixir Tips Episode #7
Check out the Episode 7 on 10 Killer Elixir Tips
https://medium.com/blackode/10-killer-elixir-tips-7-62efc9c5aa14
Happy Coding…
petecorey
Hey all,
I continue my journey through Mastering Bitcoin. This week I read about using BIP-39 style mnemonics to memorize wallet seeds. The algorithm used to create them seemed like an excellent exercise to train my Elixir muscles. I think I’m starting to get a little too comfortable with binary manipulation in Elixir, haha.
If you’re curious, check out the article: From Bytes to Mnemonic using Elixir. Let me know what you think!
svilen
Author of Concurrent Data Processing in Elixir
Some GDPR-compliancy tips, inspired by the upcoming deadline (May 25th) 
idi527
I would probably generate a lookup table out of function heads of the wordlist at compile time to replace
for <<chunk::11 <- entropy>> do
Enum.at(wordlist, chunk)
end
with
@spec lookup_in_wordlist!(pos_integer) :: String.t | no_return
defp lookup_in_wordlist!(chunk)
# or something like that (I would probably replace fetch_env with File.stream!)
for {word, index} <- :bip39 |> Application.fetch_env!(:wordlist) |> Enum.with_index() do
defp lookup_in_wordlist!(unquote(index)), do: unquote(word)
end
defp lookup_in_wordlist!(unmatched_chunk) do
raise("No match for chunk: #{unmatched_chunk}")
end
@spec entropy_to_wordlist!(bits) :: [String.t] | no_return
def entropy_to_wordlist!(entropy) do
for <<chunk::11 <- entropy>> do
lookup_in_wordlist!(chunk)
end
end
it also doesn’t load the whole wordlist in memory every time but stores it with the rest of the code once.
idi527
Great article, I’m a bit hesitant on encryption though …
I usually try to follow How to Safely Store User Data
petecorey
Wow, that’s an awesome idea. I was considering building out a map of index to word to speed up lookup, but I never would have considered programmatically building out function heads to match on indexes. Thanks!
