Hedera (HBAR) vs Gram (prev. Toncoin) (GRAM)

Hedera Hashgraph is a layer 1 blockchain platform that aims to be a more efficient, secure, and reliable distributed ledger than Bitcoin. The protocol is based on Proof of Stake (PoS) and is powered by a unique technology called Hashgraph, which incorporates concepts from directed acyclic graph theory for node management and a mechanism called "gossip protocol" for transaction validation.

The Open Network (TON) is an open-source ecosystem based on the TON blockchain. This network is the backbone of a complex, multi-layered architecture, composed of several "workchains," which are themselves divided into several "shardchains," allowing for a high level of performance. Initially built by the Telegram messaging team, the Open Network project is now independent and its development relies on its community of developers.