README
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Coreth and the C-Chain
Avalanche is a network composed of multiple blockchains. Each blockchain is an instance of a Virtual Machine (VM), much like an object in an object-oriented language is an instance of a class. That is, the VM defines the behavior of the blockchain. Coreth (from core Ethereum) is the Virtual Machine (VM) that defines the Contract Chain (C-Chain). This chain implements the Ethereum Virtual Machine and supports Solidity smart contracts as well as most other Ethereum client functionality.
Building
The C-Chain runs in a separate process from the main AvalancheGo process and communicates with it over a local gRPC connection.
AvalancheGo's build script downloads Coreth, compiles it, and places the binary into the avalanchego/build/plugins directory.
API
The C-Chain supports the following API namespaces:
ethpersonaltxpooldebug
Only the eth namespace is enabled by default.
To enable the other namespaces see the instructions for passing in the coreth-config parameter to AvalancheGo: https://docs.avax.network/build/references/command-line-interface#plugins.
Full documentation for the C-Chain's API can be found here.
Compatibility
The C-Chain is compatible with almost all Ethereum tooling, including Remix, Metamask and Truffle.
Differences Between Avalanche C-Chain and Ethereum
Atomic Transactions
As a network composed of multiple blockchains, Avalanche uses atomic transactions to move assets between chains. Coreth modifies the Ethereum block format by adding an ExtraData field, which contains the atomic transactions.
Avalanche Native Tokens (ANTs)
The C-Chain supports Avalanche Native Tokens, which are created on the X-Chain using precompiled contracts. These precompiled contracts nativeAssetCall and nativeAssetBalance support the same interface for ANTs as CALL and BALANCE do for AVAX with the added parameter of assetID to specify the asset.
For the full documentation of precompiles for interacting with ANTs and using them in ARC-20s, see here.
Block Timing
Blocks are produced asynchronously in Snowman Consensus, so the timing assumptions that apply to Ethereum do not apply to Coreth. To support block production in an async environment, a block is permitted to have the same timestamp as its parent. Since there is no general assumption that a block will be produced every 10 seconds, smart contracts built on Avalanche should use the block timestamp instead of the block number for their timing assumptions.
A block with a timestamp more than 10 seconds in the future will not be considered valid. However, a block with a timestamp more than 10 seconds in the past will still be considered valid as long as its timestamp is greater than or equal to the timestamp of its parent block.
Directories
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| Path | Synopsis |
|---|---|
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Package accounts implements high level Ethereum account management.
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Package accounts implements high level Ethereum account management. |
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keystore
Package keystore implements encrypted storage of secp256k1 private keys.
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Package keystore implements encrypted storage of secp256k1 private keys. |
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Package consensus implements different Ethereum consensus engines.
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Package consensus implements different Ethereum consensus engines. |
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Package core implements the Ethereum consensus protocol.
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Package core implements the Ethereum consensus protocol. |
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bloombits
Package bloombits implements bloom filtering on batches of data.
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Package bloombits implements bloom filtering on batches of data. |
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rawdb
Package rawdb contains a collection of low level database accessors.
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Package rawdb contains a collection of low level database accessors. |
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state
Package state provides a caching layer atop the Ethereum state trie.
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Package state provides a caching layer atop the Ethereum state trie. |
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state/snapshot
Package snapshot implements a journalled, dynamic state dump.
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Package snapshot implements a journalled, dynamic state dump. |
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types
Package types contains data types related to Ethereum consensus.
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Package types contains data types related to Ethereum consensus. |
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vm
Package vm implements the Ethereum Virtual Machine.
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Package vm implements the Ethereum Virtual Machine. |
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vm/runtime
Package runtime provides a basic execution model for executing EVM code.
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Package runtime provides a basic execution model for executing EVM code. |
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Package eth implements the Ethereum protocol.
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Package eth implements the Ethereum protocol. |
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filters
Package filters implements an ethereum filtering system for block, transactions and log events.
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Package filters implements an ethereum filtering system for block, transactions and log events. |
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tracers
Package tracers is a collection of JavaScript transaction tracers.
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Package tracers is a collection of JavaScript transaction tracers. |
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tracers/internal/tracers
Package tracers contains the actual JavaScript tracer assets.
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Package tracers contains the actual JavaScript tracer assets. |
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Package ethclient provides a client for the Ethereum RPC API.
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Package ethclient provides a client for the Ethereum RPC API. |
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Package ethereum defines interfaces for interacting with Ethereum.
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Package ethereum defines interfaces for interacting with Ethereum. |
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internal
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debug
Package debug interfaces Go runtime debugging facilities.
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Package debug interfaces Go runtime debugging facilities. |
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ethapi
Package ethapi implements the general Ethereum API functions.
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Package ethapi implements the general Ethereum API functions. |
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Package miner implements Ethereum block creation and mining.
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Package miner implements Ethereum block creation and mining. |
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evm
(c) 2019-2020, Ava Labs, Inc.
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(c) 2019-2020, Ava Labs, Inc. |
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Package rpc implements bi-directional JSON-RPC 2.0 on multiple transports.
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Package rpc implements bi-directional JSON-RPC 2.0 on multiple transports. |