Hedera Hashgraph is a public network based on distributed ledger technology (DLT), developed for businesses and companies as a platform for decentralized services and applications. Hedera positions itself as a third–generation public network, the next stage in the development of bitcoin and Ethereum. The strengths of the project include high scalability, security, smart contracts, energy efficiency and low usage fees.

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The DragonGlass REST API allows you to query historical data by transactions and accounts on both the testnet and mainnet. Learn these basics to get started:
https://www.hedera.com/blog/query-historical-data-rest-api