Fantom is a series of technology components, that, when combined, form a technology stack that allow a larger ecosystem of applications to be built on top of them.

https://fantom.foundation
https://xar.network/

The focus is on developing the Lachesis asynchronous Byzantine Fault Tolerance (“aBFT”) and TxFlow consensus mechanisms.

“aBFT” means that transactions are confirmed as fast as possible as they enter the network, instead of waiting for previous transactions to be confirmed. This significantly speeds up the network.

https://arxiv.org/abs/1810.10360
https://arxiv.org/abs/1908.11810

Instead of centralizing all computing power and all usage on a single decentralized ledger, users of the Fantom ecosystem deploy their own independent distributed ledgers with the consensus at its core, while being able to communicate with one another.

At the moment two mainnets have been deployed:

• Opera (smart contract platform - 500 transactions per second) - https://explorer.fantom.network/
  
• XAR (DeFi platform built with Cosmos SDK using Fantom consenus - 20,000 transactions per second) - https://explorer.xar.network/
  

The transaction speed on Opera has been limited to 500 TPS because of the EVM. In Q3 of 2020 Fantom is expected to have its own virtual machine (FVM) which will drastically improve the transaction speed on Opera.