Month: October 2017

Paper and Hardware Wallets


Once your crypto is printed, store it at some safe place. When ready to cash in the currency use some online or mobile wallet app to get the coins from the paper to the wallet or your bank. Some exchanges allow you to go straight from the paper wallet to the exchanges´s online wallet.


– Cannot be hacked online
– Can be stored in a safe place like a safety deposit
– Dont worry about outages or hardware issues.

Recommender Systems

Full implementation is complex: it needs advanced linear algebra.

Types of Recommender Systems:

  • Content based. Focus on the attributes of the items: the usual “related items”.
  • Collaborative filter (CF). Uses “wisdom of the crowd” to recommend items: eg Amazon. CF is most used on content based systems.