mr_green_tea

I'm pretty sure active trading with BTC is mostly regarding drug dealing through dark net market places. And the conversion mostly dealers selling BTC for USD to consumers, which buy drugs with BTC and those BTC will be sold back to the consumers for USD.

As far as I can tell there is simply nothing else to do with BTC as of now ... sure you can use it in some shops and you can buy plane tickets from Air Baltic with BTC - but those purchases are always actually more expensive to cover for the volatility of the BTC value and of interest only for users who think its fun to actually use BTC in the real world.

Probably it will either establish as an illegal clandestine super-national currency or it will be hijacked by banks for whatever weird theoretical purpose.

bitcoin.de seems quite reliable and trustworthy. I bought bitcoins there and also use it as a wallet.

I successfully encouraged my boss to donate to GnuPG (https://gnupg.org/donate/index.html) when it was covered in the media.

But in general it seems that most business owners I worked for don't think about that also open source and free software projects need money to be kept alive an thriving.

> Sorry that there's so comments section.

Just switch it on ... it's your site, isn't it?

> The data is pretty clear in terms of source...Spotify in 2014

That's not the "source" that's just a value of the time dimension.

> one of Spotify's data partners

well, you could have given that information in the text - if you talk about data, you gotta talk about where you got the data from.

Nonetheless the statement is still pretty obscure. Who is that "partner" - is it a secret?

Why don't you just dump the data on GitHub?

> I could have create an index that abstracted several data sources, but that would have killed the readability of the article.

I'm not sure if that is the true reason why you chose not to do it - but if so, then it is necessary to be transparent with assumptions, abstractions and simplifications, right?

how did you "call" the data?

Also interested in how the data was gained.

First of all I do dislike blog posts which lack a comment section to ask questions, criticize or praize.

Second of all I do dislike texts on data which lack information on where the data comes from.

I can think of ways to mine present day play counts from Spotify (while not working there) but I wonder where did he get the daily counts from he used in the last chart. Any ideas?

Furthermore I doubt that Spotify is necessarily a good indicator on how songs are being perceived in the long run. Especially b/c there are local platform-specific attractor dynamics at play.

> The last time I tried to rent a room at a hotel in Canada, they would not accept cash -- credit card only.

> In the UK, I used to use my Oyster card (a pre-paid travel card for public transit in London). I could basically use it like cash.

You might want to consider a pre-paid credit card :)

Regarding ...

> #5 LTV (Life Time Value)

Shouldn't the calculation factor in the time value of the money over the estimated life time?

https://en.wikipedia.org/wiki/Time_value_of_money

This frame slightly worried me:

http://i.imgur.com/3QuJjRY.jpg

Because ...

https://en.wikipedia.org/wiki/Shutdown_(computing)#/media/Fi...

The clip is from three years ago, though. So there's hope!