Scales deposit with commitment complexity.
Current Value
0 TAO (0 raw)
Conversion: ÷ 10^9 (RAO → TAO)
Relevant for: validatorsminersdevelopers
The Big Picture
Each additional field in a commitment increases the required deposit. Currently set to 0 on Bittensor, meaning fields are free. If non-zero, total deposit = InitialDeposit + (fields * FieldDeposit).
Why This Matters
More fields = more deposit (if FieldDeposit > 0). Plan your commitment structure accordingly.
Example
FieldDeposit is 0. Adding more fields doesn't increase your deposit requirement.
Common Questions
- Is there a maximum total deposit?
- It's capped by MaxFields. Max deposit = InitialDeposit + (MaxFields * FieldDeposit).
From Chain Metadata
The amount held on deposit per additional field for a registered identity.
Use Cases
- Calculate total deposit for multi-field commitments
- Optimize field count for deposit efficiency
Code Examples
import { ApiPromise, WsProvider } from "@polkadot/api";
import { stringCamelCase } from "@polkadot/util";
const provider = new WsProvider("wss://entrypoint-finney.opentensor.ai:443");
const api = await ApiPromise.create({ provider });
// Query FieldDeposit constant
const value = api.consts[stringCamelCase("Commitments")][stringCamelCase("FieldDeposit")];
console.log("FieldDeposit:", value.toHuman());
// Convert RAO to TAO if this is a balance value
const taoValue = value.toBigInt() / BigInt(1e9);
console.log("TAO:", taoValue.toString());Type Information
- Type
- u64
- Byte Size
- 8 bytes
- Encoding
- fixed
- Raw Hex
- 0x0000000000000000
Runtime Info
- Pallet
- Commitments
- First Version
- v140
- Latest Version
- v140
- Current Runtime
- v393