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SUBMIT A PRSUBMIT AN ISSUElast edit: May 28, 2025

Bittensor EVM: Examples and Precompiles

Available Precompiles​

The following precompiles are available on the Bittensor EVM.

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

Tutorials and 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