BlockChain.info is a utility site offering a number of free and fee-based services:
- Alternative block chain browser
- Payment notification/alerts
- Data and charts providing insight into the Bitcoin P2P network
The site was launched on August 30, 2011, originally as the PiUK-BlockChain-Browser. It is maintained by Ben Reeves and was built with the intended purpose of recording double spend attacks and various currency statistics.