Ethereum ERCs

ERC-7409 is a standard that allows users to react to ERC-721 and ERC-1155 tokens using Unicode emojis. It provides a public, non-gated repository smart contract that exists at the same address across all Ethereum networks, enabling standardized on-chain interactions.

Key improvements over ERC-6381: ERC-7409 supersedes ERC-6381. While ERC-6381 used bytes4 to represent emojis, ERC-7409 uses string to accommodate the full range of Unicode emojis, including variation flags and skin tones.

Core Use Cases:

• Interactivity: Allows users to express admiration or react to actions performed by token owners.
• Feedback-based evolution: Enables tokens to evolve or change state when specific emote thresholds are met on-chain.
• Valuation: Provides real-time, on-chain indicators of desirability and social sentiment, offering a metric beyond simple sales history.

ERC-8257 defines a permissionless onchain registry designed for AI agent tools. It provides a chain-native directory that allows agents to discover and verify tools through a combination of onchain commitments and offchain manifests.

Key Features

• Onchain Commitment: The registry stores a keccak256 hash of an offchain manifest. This allows consumers to verify that the fetched manifest has not been tampered with.
• Extensible Access Control: Tool invocation is gated by an optional external predicate contract. This follows a pluggable pattern (similar to Seaport zones or Uniswap v4 hooks), allowing for any access model such as NFT gating, subscriptions, or DAO votes without changing the registry itself.
• Origin-Binding: Registrations are anchored to a canonical offchain manifest served at a well-known path on the endpoint's origin.
• Protocol-Agnostic Pricing: Pricing details are stored in the offchain manifest rather than onchain. The manifest includes pricing hints and identifies the payment protocol via an opaque string, allowing agents to compare costs before invocation. The registry does not handle funds; the endpoint enforces payment based on the manifest's declarations.

ERC-6551 defines a system that assigns a unique Ethereum smart contract account to every non-fungible token (NFT). This allows NFTs to act as autonomous agents capable of owning assets, executing operations, and interacting with decentralized applications (dApps) just like a standard Ethereum user account.

Key Capabilities

• Self-Custody: NFTs can own other on-chain assets (fungible or non-fungible).
• Agency: NFTs can execute arbitrary operations on-chain.
• Compatibility: The system works with existing ERC-721, ERC-1155, and other standards without requiring changes to the original NFT smart contracts.
• Infrastructure Support: Because the bound accounts are standard Ethereum addresses, they are compatible with existing on-chain protocols and off-chain indexers.

Core Mechanism

A singleton registry is used to assign unique, deterministic smart contract account addresses to NFTs. Each account is permanently bound to a single NFT, and the holder of that NFT maintains control over the account.

ERC-6105 is a protocol designed to add marketplace functionality directly to ERC-721 tokens. It enables non-fungible token trading without the need for a centralized intermediary trading platform. This protocol aims to solve several industry issues:

• Security: Reduces reliance on setApprovalForAll, which exposes users to risks if a platform is compromised or if phishing scams occur.
• Cost Efficiency: Minimizes gas expenditures by reducing the need to authorize multiple platforms and eliminates high trading service fees charged by centralized platforms.
• Liquidity & Decentralization: Addresses the problem of dispersed liquidity and centralized decision-making found in aggregators and off-chain order books.
• Royalty Control: Allows creators to implement more diverse and reliable royalty schemes that are not subject to the centralized decisions of trading platforms.
• Censorship Resistance: Provides a decentralized alternative to platforms that may delist NFTs or implement non-transparent delisting rules.

ERC-7777 defines a standard for managing identities and governance in mixed societies of humans and robots. It introduces two primary interfaces to facilitate decentralized, rule-based interactions:

1. IUniversalIdentity: Enables both humans and robots to establish on-chain identities. For robots, this includes support for hardware-backed identity verification, allowing physical devices to prove their identity via cryptographic signatures from secure hardware elements using a challenge-response scheme. This allows robots to participate in on-chain transactions and comply with digital laws.

2. IUniversalCharter: Provides a framework for creating and managing self-regulated societies (charters). It allows participants to create, register (join), update, leave, and terminate societies governed by specific, predefined rule sets. This enables scalable, decentralized governance that is not tied to physical geography.

These interfaces aim to provide an equitable framework where non-human computer architectures can interact with humans in a transparent, secure, and enforceable manner.

My Own Messages (MOM) is a standard for creating public, unstoppable, and verifiable message boards using Ethereum as a certification layer. Instead of using smart contracts, MOM utilizes simple self-send transactions with specific payloads attached to notarize the multihash of a message.

Key Use Cases

• Developers/Pool Owners: Send decentralized messages to users that are as reliable as the smart contract itself, avoiding reliance on third-party social media.
• Users: Publish content, share thoughts, or send messages to smart contract owners or transaction senders without complex tooling.
• Explorer Services: Provide a native, secure way for users to read information from smart contract owners without using external comment systems (like Disqus).

Core Advantages

• Verifiability: By notarizing the multihash of the content on-chain, you can verify the integrity of messages even if they are stored on centralized services or distributed via IPFS/Swarm.
• Low Cost: Users pay a small transaction fee to notarize messages, making it more affordable than on-chain storage.
• Security: Transactions have no value transfer (unless intended) and no smart contract addresses to fake, reducing scam potential. Spam is mitigated by the cost of transactions and the requirement for listeners to explicitly follow/listen to specific accounts.