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Technical Definition

ERC-6551

ERC-6551 (Token-Bound Account) ERC-6551 is an Ethereum standard that gives every ERC-721 NFT its own smart contract wallet. The NFT becomes the owner of an account that can hold tokens, sign transactions, and interact with dApps — making the NFT itself a portable, on-chain identity and asset container.

By Crypto University Editorial
ERC-4337NFTSmart Contract

✦ Key Insight

ERC-6551 turns NFTs from collectibles into wallets. For traders, this matters because an NFT can now bundle tokens, other NFTs, on-chain history, and game items into a single transferable unit — changing what "buying an NFT" actually means.

✕ Common Misconceptions

Sending high-value assets to a token-bound account without realizing they transfer with the NFT.

Assuming all marketplaces fully display nested contents — many do not.

Approving dApps via the bound account without understanding scope.

Detailed Explanation

How It Works: A registry contract deterministically computes the smart wallet address for each NFT. When the NFT changes hands, control of the bound account transfers with it automatically — the new holder can sign on its behalf. The bound account is a normal smart contract wallet otherwise.

FAQs:

  • Can I empty a token-bound account before selling the NFT? Yes, if you control the NFT at that moment.

Does it work on all chains? Any EVM chain that supports the registry contract.

In Practice

“A game character NFT contains its earned tokens, equipment NFTs, and quest progress in its token-bound account. When the character is sold, the entire inventory transfers with it.”

Dig Deeper

Smart Contract

A smart contract is self-executing code stored on a blockchain that automatically performs actions when certain conditions are met.

NFT

Non-Fungible Token — a unique digital asset stored on a blockchain that represents ownership of digital content.

ERC-4337

ERC-4337 is the Ethereum standard that enables account abstraction without requiring changes to the base protocol. It defines how smart contract wallets can submit transactions through a new infrastructure layer — UserOperations, bundlers, EntryPoint contracts, and paymasters — rather than relying on traditional Externally Owned Accounts

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