instantiate_old_weight
Call v334 → current #2Legacy instantiate using old weight format (deprecated).
View calls on chainCall Workflow
This diagram shows the call execution flow: starting with instantiate_old_weight, passing through validation
(signature, nonce, mortality, fee payment), then pre-dispatch checks, followed by dispatch which emits events: Instantiated and modifies storage: ContractInfoOf, CodeInfoOf, Nonce, and finally post-dispatch where ExtrinsicSuccess is emitted and fees are settled.
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Used by: developers
The Big Picture
Legacy version of instantiate for backward compatibility. Use the current version for new development.
Use Cases
- Support old tools/libraries not updated to new weight format
- Backward compatibility during transition periods
From Chain Metadata
Deprecated version if [`Self::instantiate`] for use in an in-storage `Call`.
Input Parameters
| # | Name | Type | Description |
|---|---|---|---|
| 0 | value | Compact<u64> Cpt BalanceOf<T> | value: Balance in chain native currency (RAO for TAO; ÷10⁹) (RAO -> TAO (/ 10^9)) |
| 1 | gas_limit | Compact<u64> Cpt OldWeight | gas_limit: Legacy Substrate weight (pre-WeightV2) (SCALE compact -> integer) |
| 2 | storage_deposit_limit | Option Option<<BalanceOf<T> as codec::HasCompact>::Type> | storage_deposit_limit (Option) |
| 3 | code_hash | H256 CodeHash<T> | code_hash: Contract code hash |
| 4 | data | Vec<u8> Vec | data (Vec<u8>) |
| 5 | salt | Vec<u8> Vec | salt (Vec<u8>) |
Permissions
Origin
Unknown
Required Role
Permission data inferred from metadata. May be incomplete.
Requirements
- Same as Contracts.instantiate
Effects
Events Emitted
Storage Modified
Postconditions
- Same as Contracts.instantiate
Side Effects
- Same as Contracts.instantiate
Code Examples
import { createClient, Binary } from "polkadot-api";
import { getWsProvider } from "polkadot-api/ws";
import { sub } from "@polkadot-api/descriptors"; // generated by: npx papi add sub -w wss://entrypoint-finney.opentensor.ai:443
const client = createClient(getWsProvider("wss://entrypoint-finney.opentensor.ai:443"));
const api = client.getTypedApi(sub);
// Build instantiate_old_weight call (typed, named args)
const value = 0n;
const gas_limit = 0n;
const storage_deposit_limit = undefined;
const code_hash = "0x0000000000000000000000000000000000000000000000000000000000000000";
const data = Binary.fromOpaque(new Uint8Array(0));
const salt = Binary.fromOpaque(new Uint8Array(0));
const tx = api.tx.Contracts.instantiate_old_weight({
value,
gas_limit,
storage_deposit_limit,
code_hash,
data,
salt,
});Runtime Info
- Pallet Index
- 29
- Call Index
- 2
- First Version
- v334
- Current Version
- v411