v2.1.3

This version contains a few important sigchain related consensus upgrades that will greatly increase network security:

• Introduce sighash left shift mechanism
• Implement sighash left shift for sigchain with skipped hops
• Implement sighash left shift for sigchain with recent miners

The new mechanism will be enabled at block height 2,633,000. Please make sure all nodes upgrade before this height.

In addition, a few improvements and bug fixes are included in this version:

• Reduce the log level of some common message
• Fix the bug that node with certain local ledger cannot join the network
• Prevent nknc from creating empty log file on each start