[testnet]Different wersions of block

[Frodek]

On testnet I have map where appears new version:
https://drive.google.com/open?id=0B7E799YMGCWTWkF1cE8taEo1ZVU
What is technical difference between version 1 and 0x20000000 for example?

[achow101]

Different block versions are present in both testnet and mainnet. It is used for signaling to activate soft forks. The first block version is version 1. Previous soft forks used a system called IsSuperMajority (ISM). These used fixed version numbers, consuming numbers 2, 3, and 4. We now use a new soft fork mechanism called BIP 9 Versionbits. BIP 9 specifies that all version numbers must have the top 3 bits of the version number be 001, which results in a version number of 0x20000000. From there, other bits are set for various soft forks, and unset once the fork has activated. For example, segwit uses bi 1, so setting bit 1 results in a version number of 0x20000002.