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ERC-8004 – Trustless Agents

ERC-8004: Trustless Agents – The Standard Powering the AI Agent Economy

Version 1.0
Date: June 2026

The Trust Problem in AI Agents

AI agents are becoming increasingly powerful. They can already communicate with each other, use tools, execute tasks, and even make payments. However, there was a fundamental missing piece:

How can an AI agent trust another agent it has never interacted with before — especially when they belong to different organizations or ecosystems?

Without a shared trust layer, agents were forced to operate in closed environments or rely on manual, pre-established relationships. This severely limited the potential of an open, global agent economy.

ERC-8004 solves exactly this problem.

What is ERC-8004?

ERC-8004 (Trustless Agents) is an Ethereum standard that creates a universal, on-chain trust infrastructure for autonomous AI agents. It allows agents to:

  • Prove their identity in a portable and censorship-resistant way.
  • Build and carry reputation across different platforms and chains.
  • Verify the quality and correctness of other agents’ work through independent validations.

In short: ERC-8004 turns AI agents into accountable economic actors that can discover, evaluate, and interact with each other in a permissionless environment.

Why It Matters (Business Perspective)

Without ERC-8004With ERC-8004
Agents only trusted inside closed systemsAgents can interact across organizations
Reputation trapped in each platformPortable reputation that travels with the agent
Manual or centralized trustProgrammable, on-chain, auditable trust
High risk for users and protocolsVerifiable identity + reputation + validation
Limited agent-to-agent commerceFoundation for open agent economies

ERC-8004 enables real-world use cases such as:

  • A lending protocol automatically checking an agent’s reputation before extending credit.
  • A DAO hiring specialized agents based on verified past performance.
  • Agents discovering and collaborating with each other across different platforms without human intervention.

Technical Overview

The Three Core Registries

ERC-8004 defines three lightweight, composable on-chain registries that together form the trust layer:

1. Identity Registry

Every agent receives a unique, portable on-chain identity (implemented as an ERC-721 token).

This identity is:

  • Globally unique and censorship-resistant.
  • Points to a rich metadata file (usually hosted on IPFS or HTTPS) containing the agent’s name, description, capabilities, endpoints (A2A, MCP, APIs, etc.), and supported trust models.

This allows any application or agent to discover and understand what another agent can do in a standardized way.

2. Reputation Registry

Allows anyone (users, other agents, platforms) to submit structured feedback after interacting with an agent.

Feedback includes:

  • Numeric scores (with decimal precision)
  • Categories/tags
  • Optional references or proofs (off-chain)

This creates a portable, queryable reputation history that agents carry with them across the ecosystem.

3. Validation Registry

Enables independent third-party validation of an agent’s outputs or behavior.

Validators can use different methods:

  • Re-execution of tasks
  • Zero-knowledge machine learning proofs (zkML)
  • Trusted Execution Environment (TEE) attestations
  • Other verification mechanisms

This provides stronger, evidence-based trust signals, especially important for high-stakes tasks.

Trust Models

ERC-8004 supports pluggable and tiered trust models. The level of security can scale with the value or risk of the interaction:

  • Low-stakes tasks → Simple reputation/feedback
  • Medium-stakes → Crypto-economic validation (staking + slashing)
  • High-stakes (medical, financial, legal) → Cryptographic proofs (zkML, TEE, etc.)

Key Technical Characteristics

  • Portable identities: Agents are identified globally via agentRegistry + agentId.
  • Lightweight design: The standard focuses on registries and leaves application-specific logic off-chain.
  • Composable: Other protocols and smart contracts can read and build on top of these registries.
  • Multi-chain friendly: Can be deployed as canonical registries on any EVM-compatible chain.

Connection with Global Score Agent

Global Score Agent is built on top of the ERC-8004 foundation.

While ERC-8004 provides the universal on-chain infrastructure (Identity + basic Reputation + Validation registries), Global Score Agent delivers advanced reputation intelligence through two specialized indices:

  • HUMI Index: Multi-pillar reputation scoring specifically designed for Agents (History, Usage, Measures, Information).
  • WAMI Index: Reputation scoring for the wallets that own or control agents.

These indices can feed enriched, high-quality data into the ERC-8004 Reputation Registry and help users, protocols, and other agents make better decisions when selecting or interacting with agents registered under the standard.

Resources

Document created for Global Score Agent – June 2026
Version 1.0