Kraken is a Proof of Work and Proof of Stake cryptocurrency with the same hashing algorithm as Bitcoin, SHA-256.
Users can send and recieve Kraken freely and almost intantly.
Every single transaction is traceable and irretrievably stored in the blockchain.
Your coins and deposits are available and tradable 24 hours a day, 7 days a week.
The registration is free, depending on the provider there are different fees for the trade.