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Otro Pallet

The Otro Pallet provides a Substrate-native implementation of smart accounts.

A Smart Account, in this context, is a Substrate account that can be controlled through various aliases, each associated with a unique public key.  This allows users to sign transactions using any registered alias. For instance, you could receive assets on a Substrate address and spend them using an Ethereum, RSA, or BLS signature. This versatility is what Otro enables.

Key functionalities:

  • Generation of smart accounts from owner accounts.
  • Registration and management of credentials.
  • Verification of transactions signed with either owner or aliases.

Supported Signatures Schemas

Currently, the pallet supports the following signature schemas:

  • SR25519
  • ED25519
  • ECDSA
  • Ethereum
  • BLS only if the bls feature is enabled.
  • RSA only if the rsa feature is enabled.

Note: In all cases the payload is hashed with the blake2_256 algorithm, except in Ethereum, which uses keccak256.

Integration

To integrate the Otro pallet with your runtime, you need to redefine the signature type used in your blockchain. Replace the default Substrate signature with NativeOrSmartSignature to enable compatibility with both native and smart signatures. Modify your runtime as follows:

use sp_runtime::MultiSignature;
use sp_runtime::traits::{IdentifyAccount, Verify};
use pallet_otro::{SmartCredentialsProvider, NativeOrSmartSignature};

pub struct Runtime;  // your defined runtime

pub type NativeSignature = MultiSignature;  // or any other native signature type
pub type AccountId = <<NativeSignature as Verify>::Signer as IdentifyAccount>::AccountId;

pub type Signature = NativeOrSmartSignature<
    SmartCredentialsProvider<Runtime>,
    NativeSignature,
>;

You will also need to add the pallet_otro to your runtime.

License

The code within this repository is licensed under Apache-2.0 license. See the LICENSE file for more details.