Transactions

fund-evm-key

Fund an EVM (h160) address with TAO from the signing coldkey.

An EVM account's native balance lives at its ss58 mirror address (blake2_256("evm:" ++ h160)). This intent computes the mirror and transfers TAO to it; the funds then appear as the EVM account's balance in MetaMask or any Ethereum tool (displayed with 18 decimals there: 1 TAO = 1e18). Like any transfer this is irreversible — and only the holder of the EVM private key can move the funds afterwards, so double-check the address.

Signer	Origin	Pallet	Wraps
`coldkey`	signed account (pallet role may apply)	Balances	`Balances.transfer_keep_alive`

Parameters

Parameter	Type	Required	Description
`evm_address`	string	yes	EVM address to fund, as 0x-prefixed h160 hex.
`amount_tao`	number \| `"all"`	yes	How much TAO to send.

Address parameters (--hotkey, --coldkey, --dest, ...) accept a raw ss58 address, an address-book or proxy-book name, or a local wallet/hotkey name.

CLI

Preview with --dry-run (shows fee, effects, and policy result without submitting), then submit:

btcli tx fund-evm-key \
  --evm-address <value> \
  --amount-tao <amount|all> --dry-run
btcli tx fund-evm-key \
  --evm-address <value> \
  --amount-tao <amount|all> -w my_coldkey

Python

import bittensor as bt
from bittensor.wallet import Wallet

wallet = Wallet(name="my_coldkey", hotkey="my_hotkey")
intent = bt.FundEvmKey(evm_address="...", amount_tao=1.0)

sub = bt.Subtensor()
plan = sub.plan(intent, wallet)   # fee, effects, policy — no submission
result = sub.execute(intent, wallet)
if not result.success:
    print(result.error.code, result.error.remediation)

(bt.Subtensor is also the async client — async with bt.Subtensor() as client: — see The client.) Or build the intent by op name, as an agent would:

result = sub.execute_tool("fund_evm_key", {...}, wallet)

On-chain implementation

Balances.transfer_keep_alive is implemented by Substrate's pallet_balances, outside this repository's pallets.

Every file is browsable under /code exactly as built into the runtime, or as plain text under /code/raw/<path> (index: /code/index.json).