Updated the bitcoin installation instructions

[ErikDeSmedt]

It turns out that bitcoin-core stopped maintaining the ppa.
I have updated the instructions to download form BitcoinCore instead.

This is also mentioned in issue 143.

[wintercooled]

Nice one. I will review this now. Thanks.

[wintercooled]

Make sure you'll download the binaries
Can you change this to "Make sure you download the binaries"

SHA256SUM.asc-file.
Can you change this to SHA256SUM.asc file.

The instances of SHA256SUM should I think be SHA256SUMS

/usr/bin/bitcoind
Should this not be /usr/local/bin/bitcoind ?

Thanks.

[ErikDeSmedt]

Your comments are on point.
I have updated them in the previous commit/

[wintercooled]

Sorry - could you change the minor nits mentioned:

"Make sure you'll download the binaries"

• Can you change this to "Make sure you download the binaries"

"SHA256SUM.asc-file."

• Can you change this to "SHA256SUMS.asc file" (remove the -).

Then I will merge

[wintercooled]

I think also a link to https://github.com/bitcoin/bitcoin/blob/master/contrib/verify-commits/trusted-keys is worth adding - as otherwise the key for checksums might be questioned. So you could make the "bitcoin-core maintainer" text a link to the above url perhaps?

[ErikDeSmedt]

I have added a short explanation + link to the trusted keys

[wtogami]

I recommend exporting those keys as ascii armored text and including them in a folder in this repo.