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Bittensor EVM: Examples and Precompiles

Available Precompiles​

The following precompiled smart contracts are available on the Bittensor EVM. The source code can be found on GitHub.

Code examples used throughout are provided by OTF, and come from this repository.

Install the EVM Examples repo

  1. Clone the Opentensor EVM-Bittensor GitHub repo:

    git clone https://github.com/opentensor/evm-bittensor.git

  2. Navigate to evm-bittensor directory:

    cd evm-bittensor

  3. Install the dependencies:npm install

Examples​

Standard Ethereum Precompiles​

  • ECRecover (0x1): Recover the address associated with the public key from elliptic curve signature
  • Sha256 (0x2): SHA-256 hash function
  • Ripemd160 (0x3): RIPEMD-160 hash function
  • Identity (0x4): Identity function (returns input data)
  • Modexp (0x5): Modular exponentiation
  • Sha3FIPS256 (0x400): SHA3-256 hash function (FIPS variant)
  • ECRecoverPublicKey (0x401): Recover the public key from an elliptic curve signature

Bittensor-Specific Precompiles​

  • Ed25519Verify: Verify Ed25519 signatures
  • BalanceTransfer: Transfer TAO between accounts
  • StakingPrecompile: Manage staking operations
  • StakingPrecompileV2 (0x805): Main staking operations including:
    • addStake: Add stake to a hotkey
    • removeStake: Remove stake from a hotkey
    • moveStake: Move stake between hotkeys
    • transferStake: Transfer stake between coldkeys
    • getTotalColdkeyStake: Get total stake for a coldkey
    • getTotalHotkeyStake: Get total stake for a hotkey
    • getStake: Get stake between specific hotkey and coldkey
    • addProxy: Add a proxy delegate
    • removeProxy: Remove a proxy delegate
  • SubnetPrecompile: Manage subnet operations
  • MetagraphPrecompile: Interact with the metagraph
  • NeuronPrecompile: Manage neuron operations