Includes changes from: - https://github.com/ipfs/go-block-format/pull/37 - https://github.com/ipfs/go-libipfs/pull/58
Commit hash originally stamped into the ethereum blockchain: https://etherscan.io/tx/0xe8f51c9eefb682cd866f059462577b6dd3d2685ff4b6437f6c940ff4f4aaf067