The following sources were cited in SAP Digital Futures Issue 05: Bitcoin’s Blockchain – A New Model For Trust

The Bitcoin blockchain — the digital ledger of transactions — is growing exponentially, and doubled to 40GB from August 2014 to August 2015., Blockchain Size graph,

As of August 2015, the Bitcoin blockchain was already solving nearly 400 billion complex mathematical equations per second., Hash Rate graph,

The first worldwide conference on applying blockchain technology was held on May 28, 2015.
The Block Chain Summit,

Honduras began creating land titles based on blockchain technology in May 2015.
Gertrude Chavez-Freyfuss, “Honduras to build land title registry using bitcoin technology”, Reuters, May 15th, 2015,

Visa, the world’s largest pay­ment network, is launching a blockchain technology development team to bring secure digital finance to unbanked consumers.
Giulio Prisco, “Visa to Deploy Blockchain Research Team in Bangalore, India”, Bitcoin Magazine, August 12th, 2015,