Avalanche was initiated by Ava Labs, established by Cornell University professor Emin Gün Sirer, along with Cornell University computer science PhDs Kevin Sekniqi and Maofan “Ted” Yin. Emin Gün Sirer is an experienced figure in cryptographic research, having conceptualized a peer-to-peer virtual currency six years prior to the release of the Bitcoin whitepaper. He also contributed to work on Bitcoin scaling solutions and conducted research on Ethereum before the well-known DAO hack in 2016. The insights from this research culminated in a whitepaper that facilitated the founding of Ava Labs in 2018. In February 2019, the project completed a seed funding round, attracting investors such as Polychain, Andreessen Horowitz, and Balaji Srinivasan. Avalanche concluded its initial coin offering in 2020, raising $42 million in less than 24 hours.

Avalanche aims to address the blockchain trilemma, which suggests that blockchains cannot achieve adequate decentralization at scale, often resulting in high transaction fees, as seen with Ethereum. To tackle this issue, Avalanche has developed three interoperable blockchains: * The Exchange Chain (X-Chain) is utilized for creating and exchanging the native AVAX tokens and other assets. These tokens adhere to a set of standardized rules similar to the ERC-20 standard on Ethereum. The Avalanche consensus mechanism is employed for this chain. * The Contract Chain (C-Chain) is dedicated to hosting smart contracts and decentralized applications. It features its own Avalanche Virtual Machine, akin to the Ethereum Virtual Machine, which allows developers to create EVM-compatible DApps. This chain uses the Snowman consensus mechanism. * The Platform Chain (P-Chain) manages network validators, monitors active subnets, and facilitates the creation of new subnets. Subnets consist of sets of validators, functioning somewhat like a validator consortium. Each subnet can validate multiple blockchains; however, a blockchain can only be validated by a single subnet. This chain also utilizes the Snowman consensus mechanism. The segmentation of computational tasks enhances throughput without compromising decentralization. For example, private blockchains on the network could mandate that its subnet’s validators are sufficiently geographically distributed or adhere to specific regulations. With this modular architecture, Avalanche enhances its interoperability with other blockchains seeking integration into the Avalanche ecosystem. Additionally, the distinct consensus mechanisms are tailored to meet each blockchain’s specific needs, further optimizing their efficiency.

Avalanche's chain for decentralized finance serves as the primary chain for smart contracts and DeFi applications. Most Avalanche DApps reside on this chain and are compatible with MetaMask. These three networks are secured and validated by the Primary Network, a specialized subnet. All custom subnets must validate on the Primary Network by staking a minimum of 2,000 AVAX. Avalanche subnets, or subnetworks, consist of dynamic groups of validators collaborating to achieve consensus on the state of a set of blockchains. Each blockchain is validated by one subnet, while a single subnet can validate multiple blockchains. Validator nodes can participate in multiple subnets. Every subnet validator is incentivized to comply with the security and resource requirements of an individual subnet. Each subnet can customize these incentives, which may include token rewards, governance, and more. Subnets are designed to integrate application-specific networks into the broader Avalanche ecosystem. For instance, an application, product, or service may need certain validator characteristics, such as memory or internet bandwidth. Validators that meet these requirements can join the Subnet to facilitate smooth operations. Furthermore, Subnets may feature a native token economy and customized fee structures. Avalanche Subnets also support the development of private blockchains, where only predefined validators participate. These validators are the sole entities permitted to access the content of the private blockchain, catering to organizations seeking to keep sensitive information confidential.