Wrapped Token

How wrapping works

The basic mechanism:

• Lock original asset in custody (centralized or smart contract).
• Mint wrapped version on destination chain at 1:1 ratio.
• Burn wrapped to redeem original.
• Wrapped token trades like any other token on destination chain.

Wrapping enables assets to participate in ecosystems they're not native to.

Common wrapping examples

Major instances:

• WBTC — Bitcoin wrapped on Ethereum.
• WETH — Ether wrapped to be ERC-20 compatible.
• stETH — Lido's wrapped staked ETH.
• Cross-chain wrappers — bridged assets typically appear as wrapped versions.

WETH exists because ETH itself isn't ERC-20 compliant; wrapping makes it interact uniformly with ERC-20 tools.

Wrapping models

Several approaches:

• Custodial — centralized custodian holds original (e.g., BitGo for WBTC).
• Smart contract custody — on-chain locking (e.g., WETH).
• Bridge-based — cross-chain wrappers via bridge contracts.
• Liquid staking derivatives — wrap staked positions.

Trust assumptions vary significantly.

Why wrap

Several use cases:

• Cross-chain liquidity — use BTC in DeFi on Ethereum.
• Standard compatibility — WETH for unified ERC-20 handling.
• DeFi composability — wrapped versions plug into protocols.
• Yield opportunities — earn yield on assets in their wrapped form.

Wrapping unlocks utility but introduces new risks.

Risks

Several concerns:

• Custodian risk — if WBTC custodian fails, WBTC value collapses.
• Bridge risk — bridge exploits affect wrapped assets.
• Smart contract risk — wrapping contract bugs.
• Depeg risk — wrapped token can trade below underlying if redemption breaks.

Several major losses have come from wrapped-asset failures.

Wrapped vs. native

Trade-offs:

• Native asset — no wrapping risk; lacks composability outside its chain.
• Wrapped asset — composability, but additional risk layers.
• Best practice — wrap only what you need to use; hold most in native form.

Don't wrap unnecessarily.

Wrapped tokens and stablecoins

Note on terminology:

• Stablecoins are sometimes called wrapped USD.
• Mechanically similar — fiat held in reserves, tokens minted against them.
• Conceptually similar — claim on reserved underlying.

The distinction is mostly conceptual.

What individuals should know

For users:

• Verify wrapped asset legitimacy — fakes are common.
• Understand custody model — custodial vs. smart contract.
• Check redemption capabilities before wrapping large amounts.
• Don't hold large amounts in single wrapped asset.

For DeFi participants:

• Wrapped assets are how cross-chain DeFi works in practice.
• Stack risks carefully — wrapped + bridged + farmed compounds risk.
• Native preferred for long-term holding.

Wrapped tokens are foundational infrastructure for cross-chain DeFi. They enable composability but introduce custody and bridge risks that should be understood before extensive use.