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SUBMIT A PRSUBMIT AN ISSUElast edit: Jun 26, 2025

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 this section are provided by the Opentensor Foundation (OTF), and come from this repository.

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​

The following list consists of Bittensor-specific precompiles with links to their respective documentation:

  • 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