Metal blockchain (METAL) is a layer zero blockchain (L0) that enables any chain to deploy and reach consensus using the Snow protocols. This makes it possible to operate on a very efficient Proof-of-Stake (PoS) model, removing the need for Proof-of-Work (PoW).
Metal serves as an open-source platform for launching decentralized applications and enterprise blockchain projects within a single, interoperable, and highly scalable ecosystem. At its foundation, Metal Blockchain is a fork of the well-regarded Avalanche project.
Metal Blockchain enhances the original work of Avalanche by introducing a fourth subchain (A-Chain) to support payments and decentralized finance through the XPR Network Blockchain, which is based on the EOSIO protocol. XPR Network provides feeless transactions for users.
Moreover, Metal adds Web Authentication (WebAuth) support for the Ethereum Virtual Machine (EVM) or C-Chain.
Metal Platform
Metal includes four built-in blockchains: XPR Network Chain (A-Chain), Exchange Chain (X-Chain), Platform Chain (P-Chain), and Contract Chain (C-Chain). All four blockchains are validated and secured by all Metal validators, which are collectively known as the Primary Network. The Primary Network is a specific subnet, and all members of custom Subnets must also be part of the Primary Network by staking at least 2,000 METAL.
XPR Network Chain (A-Chain)
The A-Chain is a new Virtual Machine that is being developed to ensure compatibility with EOSIO-based chains, specifically implementing the XPR Network chain. For more details about XPR Network, click here.
It is designed to manage payments, decentralized finance, dApps, DAOs, and payment messaging (for Banks, PSPs, and Fintechs) with improved resource efficiency.
Contract Chain (C-Chain)
The C-Chain is an instance of the Ethereum Virtual Machine, designed to support the Ethereum Virtual Machine and deploy Solidity contracts that can interact with leading cryptocurrencies in a trust-less environment.
The C-Chain allows for the creation of smart contracts using the C-Chain API.
Platform Chain (P-Chain)
The P-Chain acts as the metadata blockchain on Metal, coordinating validators, tracking active Subnets, and facilitating the creation of new Subnets. It uses the Snowman consensus protocol.
This chain is designed for stakers to validate the Metal network or delegate to other validators to earn staking rewards.
The P-Chain API enables clients to create Subnets, add validators to Subnets, and create blockchains.
Exchange Chain (X-Chain)
The X-Chain serves as a decentralized platform for creating and trading digital smart assets, which represent real-world resources (like equities or bonds) governed by specific rules, such as "can’t be traded until tomorrow" or "can only be sent to US citizens."
This chain is built to support cross-chain exchanges and transfers between sub-chains.
One asset traded on the X-Chain is METAL. When you make a transaction to a blockchain on Avalanche, you pay a fee in METAL.
The X-Chain operates as an instance of the Avalanche Virtual Machine (AVM). The X-Chain API allows clients to create and trade assets on the X-Chain and other AVM instances.
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