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EVM Tutorials

Ethereum compatibility layer is now available on subtensor (the blockchain in Bittensor). Using this EVM feature you can:

  • Bring any Ethereum smart contract, deploy it on the subtensor without any need to change it, and interact with the smart contract on the subtensor blockchain.
  • Access all the standard Ethereum JSON-RPC methods from this EVM compatibility layer on subtensor.

Before you proceed

Before you proceed to use EVM on subtensor, make a note of the following:

  1. EVM smart contract executes on subtensor: The EVM feature allows the subtensor blockchain to execute Ethereum-compatible smart contracts. Note that all operations performed by this new subtensor EVM feature are executed solely on the subtensor blockchain, not on the Ethereum blockchain.
  2. Permissioned deployment: Until further notice, only white-listed parties can deploy a smart contract on subtensor. When you are ready to deploy, make a request in the evm-bittensor channel of Bittensor Discord.
  3. Permissionless interaction: However, anyone call a smart contract that was already deployed on subtensor, and interact with it in a permissionless way.
  4. 1 TAO = 1e18 on subtensor EVM: While working with the subtensor EVM, 1 TAO should be written as 1 followed by 18 zeroes, i.e., 1e18. See this code example: https://github.com/opentensor/evm-bittensor/blob/main/examples/withdraw.js#L58.
EVM on Mainnet

EVM features on the mainnet will be available only after the Bittensor 8.4.0 is released. In the mean time use this mainnet node: wss://evm.chain.opentensor.ai to access EVM on the mainnet.

Run the below tutorials to learn how to use the EVM feature on the Bittensor blockchain.

EVM on Subtensor: Basics
A beginner-friendly introduction to EVM on Bittensor.
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Install Dependencies
Get started by installing dependencies first.
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EVM Testnet with Metamask
Learn how to set up your Metamask wallet with EVM testnet.
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EVM Localnet with Metamask
Set up your Metamask wallet for a localnet with EVM feature.
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TAO transfer from Metamask to SS58
Learn how to transfer TAO from Metamask to SS58.
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Transfer TAO between two H160 addresses
Learn how to transfer TAO between two Ethereum H160 addresses.
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Configure Hardhat for subtensor EVM
Using Hardhat? Configure it to work with subtensor EVM.
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Stake with a smart contract
Stake to a hotkey using precompiled smart contract.
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Verify ed25519 with a precompile
Verify an ed25519 signature on subtensor EVM.
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