Hashgraph is a distributed ledger technology that has been described as a continuation or successor to blockchains. The hashgraph technology is currently patented, and the only authorized ledger is Hedera Hashgraph. The native cryptocurrency of the Hedera Hashgraph system is HBAR. Website can be found here.
Current Governing Council bodies:
#1 Short format introductory video: What Is Hedera Hashgraph? Easiest Explanation Ever By Leemon Baird
#2 Long format introductory video: Dr. Leemon Baird: How Hashgraph Works - A Simple Explanation w/ Pictures
#3 Exodus: What is Hedera Hashgraph (HBAR)?
#4 1st Coin Bureau video on HBAR: Hedera Hashgraph: Serious Blockchain Contender?
#5 2nd Coin Bureau video on HBAR: Hedera Hashgraph (HBAR): This YOU NEED TO KNOW!!