Hedera
  • Welcome to Hedera — let’s build the future
  • Getting Started
    • Environment Setup
    • Web2 Developers
      • Transfer HBAR
      • Create a Token
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    • EVM Developers
      • Deploy a Contract
  • Tutorials
    • Smart Contracts
      • How to Mint & Burn an ERC-721 Token Using Hardhat and Ethers (Part 1)
      • How to Set Access Control, a Token URI, Pause, and Transfer an ERC-721 Token Using Hardhat (Part 2)
      • How to Upgrade an ERC-721 Token with OpenZeppelin UUPS Proxies and Hardhat (Part 3)
      • How to Verify a Smart Contract on HashScan
      • Deploy a Smart Contract Using Remix
      • Deploy a Smart Contract Using Hardhat and Hiero JSON-RPC Relay
      • Deploy Your First Smart Contract
      • Deploy a Contract Using the Hedera Token Service
      • Send and Receive HBAR Using Solidity Smart Contracts
      • Deploy By Leveraging Ethereum Developer Tools On Hedera
      • Deploy a Subgraph Using The Graph and Hedera JSON-RPC Relay
      • Deploy Smart Contracts on Hedera Using Truffle
      • The Power of Native Hedera Tokens as ERC-20 Tokens: A step-by-step guide
      • HTS x EVM - Part 1: How to Mint NFTs
      • HTS x EVM - Part 2: KYC & Update
      • HTS x EVM - Part 3: How to Pause, Freeze, Wipe, and Delete NFTs
      • Hedera Smart Contracts Workshop
        • Setup
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        • Outro
      • Foundry
        • How to Setup Foundry and Write a Basic Unit Test
        • How to Deploy and Verify a Hedera Smart Contract with Foundry
        • How to Test A Solidity Event
        • How to Fork Testnet on Latest Block
    • Consensus
      • Submit Your First Message
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    • Tokens
      • Create and Transfer Your First NFT
      • Create and Transfer Your First Fungible Token
      • Create and Transfer an NFT using a Solidity Contract
      • Structure Your Token Metadata Using JSON Schema V2
      • Hedera Token Service - Part 1: How to Mint NFTs
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      • Hedera Token Service - Part 3: How to Pause, Freeze, Wipe, and Delete NFTs
      • Create Your First Frictionless Airdrop Campaign
    • Local Node
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      • How to Set Up a Hedera Local Node
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    • More Tutorials
      • Create and Fund Your Hedera Testnet Account
      • How to Create a Personal Access Token (API Key) on the Hedera Portal
      • How to Auto-Create Hedera Accounts with HBAR and Token Transfers
      • How to Configure a Mirror Node and Query Data
      • How to Generate a Random Number on Hedera
      • Get Started with the Hedera Consensus Service Fabric Plugin
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      • Understanding Hedera's EVM Differences and Compatibility
        • For EVM Developers Migrating to Hedera
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          • Token Management with Hedera Token Service
          • Decimal Handling (8 vs. 18 Decimals)
          • Handling HBAR Transfers in Contracts
        • For Hedera-Native Developers Adding Smart Contract Functionality
          • Integrating ED25519 Accounts and Advanced Features Into Smart Contracts
          • JSON-RPC Relay and State Queries
          • Extending Token Management with Smart Contracts
      • Creating Smart Contracts
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        • Create a file
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        • Delegate Contract ID
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      • Basic Types
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      • Style Guide
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INTRODUCTION

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TOOLS

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RESOURCES

  • Status
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  • Documentation Survey
On this page
  • Overview
  • Bridging ED25519 Accounts with Solidity
  • Integrating Multi-Sig and Threshold Keys On-Chain
  • Supporting Dynamic Key Rotation
  • References

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  1. Core Concepts
  2. Smart Contracts
  3. Understanding Hedera's EVM Differences and Compatibility
  4. For Hedera-Native Developers Adding Smart Contract Functionality

Integrating ED25519 Accounts and Advanced Features Into Smart Contracts

PreviousFor Hedera-Native Developers Adding Smart Contract FunctionalityNextJSON-RPC Relay and State Queries

Last updated 1 month ago

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Overview

Hedera-native developers can leverage Hedera’s advanced account and key management features, including ED25519 accounts, multi-sig configurations, and threshold keys. To integrate seamlessly with EVM-compatible chains and applications, you’ll need to work with ECDSA key pairs.

Hedera’s system contract functions—isAuthorized and isAuthorizedRaw—bridge this gap by enabling on-chain verification of both ED25519 and ECDSA signatures. This ensures you can extend Hedera-native security features into EVM-compatible smart contracts without compromising trust boundaries or functionality.


Bridging ED25519 Accounts with Solidity

Hedera’s ED25519 accounts are incompatible with Solidity’s ECRECOVER function, which supports ECDSA. To enable seamless integration, HIP-632 introduces two key system contract functions:

  • isAuthorizedRaw: Validates a single raw ED25519 signature.

  • isAuthorized: Validates multiple signatures or threshold key configurations, supporting multi-sig and advanced key schemes.

These functions allow you to enforce the same account security models on-chain within smart contracts.

Basic Example: Validating a Single ED25519 Signature

Here’s a Solidity example for validating ED25519 signatures using the isAuthorizedRaw function. The function calls the system contract function (isAuthorizedRaw) to verify a raw signature on-chain.

function verifyED25519Signature(
    address accountAlias,
    bytes32 messageHash,
    bytes memory signatureBlob
) public returns (bool) {
    (bool success, ) = address(0x167).call(
        abi.encodeWithSignature(
            "isAuthorizedRaw(address,bytes32,bytes)",
            accountAlias,
            messageHash,
            signatureBlob
        )
    );
    return success;
}

Use Case: Validate ED25519 signatures on-chain to ensure that only authorized accounts execute sensitive operations.


Integrating Multi-Sig and Threshold Keys On-Chain

Hedera’s account model supports multi-sig and threshold key configurations. You can replicate these models on-chain with isAuthorized for robust access control.

Example: On-Chain Multi-Sig Verification

This example demonstrates requiring multiple valid signatures for critical contract actions:

function validateMultiSig(address accountAlias, bytes memory proposalData, bytes memory signatureBlob) public returns (bool) {
    (bool success, ) = address(0x167).call(
        abi.encodeWithSignature("isAuthorized(address,bytes,bytes)", accountAlias, proposalData, signatureBlob)
    );
    return success;
}

Use Case: Ideal for governance scenarios like DAOs where multiple stakeholders must approve actions.

Advanced Example: Executing a DAO Proposal with Threshold Keys

In more complex scenarios, like DAOs, you can combine multi-sig verification with actionable contract logic to enforce threshold-based governance processes:

function executeProposal(address daoAccount, bytes memory proposalData, bytes memory signatures) public {
    require(validateMultiSig(daoAccount, proposalData, signatures), "Invalid signatures");
    // Execute the proposal logic here
}

This ensures that even on-chain actions that modify state or issue tokens adhere to your established threshold-based governance processes.


Supporting Dynamic Key Rotation

Hedera’s dynamic key rotation allows you to update an account’s keys without changing its alias. By integrating isAuthorized checks into your contracts, your on-chain logic automatically remains in sync with the current authorized keys. Even as keys change over time to improve security or operational flexibility, your contracts don’t need to be redeployed or modified—isAuthorized will always reflect the latest configuration.


References

HIP-632
HIP-632 Documentation
Hedera Account Service