A wrapped token is a cryptocurrency token pegged 1:1 to an asset from another blockchain, allowing it to be used on a chain where the original asset doesn’t natively exist. The most prominent example is Wrapped Bitcoin (WBTC), which represents Bitcoin on the Ethereum network, enabling BTC holders to participate in DeFi protocols like Aave and Uniswap.
How It Works
The wrapping process typically involves three steps:
- Deposit — A user sends the original asset (e.g., BTC) to a custodian or smart contract.
- Mint — The custodian or DAO mints an equivalent amount of wrapped tokens (e.g., WBTC) on the target chain.
- Redeem — To unwrap, the process reverses: wrapped tokens are burned, and the original asset is released.
Common Wrapped Tokens
| Wrapped Token | Underlying Asset | Target Chain | Custodian Model |
|---|---|---|---|
| WBTC | Bitcoin | Ethereum | BitGo (centralized custodian) |
| WETH | Ethereum | Ethereum | Smart contract (decentralized) |
| renBTC | Bitcoin | Ethereum | Ren Protocol (decentralized, deprecated) |
| wstETH | Staked ETH | Ethereum | Lido DAO |
WETH (Wrapped Ether) is a special case — ETH itself doesn’t conform to the ERC-20 token standard, so it must be wrapped into WETH to interact seamlessly with DeFi smart contracts. This wrapping is trustless and handled entirely on-chain.
Wrapped tokens enable cross-chain liquidity pools and let assets like Bitcoin be used for yield farming on Ethereum-based protocols.
History
- 2018 — BitGo, Kyber Network, and Ren announce the WBTC project, proposing a way to bring Bitcoin liquidity to Ethereum’s growing DeFi ecosystem.
- 2019-01 — WBTC launches on Ethereum mainnet, initially with BitGo as the sole custodian holding the underlying BTC.
- 2020 — DeFi Summer drives WBTC supply from under 1,000 BTC to over 100,000 BTC, as users rush to deposit Bitcoin into Aave, Compound, and Uniswap.
- 2021 — Wrapped tokens expand beyond Ethereum, with wrapped assets appearing on Solana, Avalanche, and Polygon via bridges.
- 2022 — Ren Protocol shuts down after its parent company Alameda Research collapses alongside Sam Bankman-Fried‘s FTX, highlighting custodial risk.
- 2024 — WBTC custody controversy erupts when BitGo announces a joint venture involving Justin Sun, prompting DeFi protocols to reevaluate WBTC as collateral.
Common Misconceptions
“Wrapped tokens are the actual underlying asset.”
They are IOUs backed by reserves. If the custodian is compromised or the bridge is hacked, wrapped tokens can lose their peg entirely.
“All wrapped tokens are centralized.”
WETH is fully decentralized via a smart contract. Newer designs use decentralized custodian networks, though most high-TVL wrapped BTC tokens still rely on centralized custodians.
Criticisms
- Centralized custodians like BitGo introduce a single point of failure that contradicts crypto’s decentralization ethos.
- Bridge exploits have resulted in billions in losses — wrapped tokens are only as secure as their bridging mechanism.
- Depegging risk means wrapped tokens can trade below par during crises, creating impermanent loss in liquidity pools.
- Regulatory uncertainty around custodians holding the underlying assets adds counterparty risk.
Social Media Sentiment
WBTC is a regular topic on r/ethfinance and r/DeFi, particularly around custody changes. The 2024 BitGo/Justin Sun controversy generated heated debate on r/CryptoCurrency about trust assumptions. Crypto Twitter frequently discusses wrapped-token bridge hacks as cautionary tales. Positive sentiment exists around trustless alternatives and native cross-chain solutions.
Last updated: 2026-04
Related Terms
Sources
- WBTC DAO & BitGo. (2019). Wrapped Bitcoin (WBTC): An ERC-20 Token Backed 1:1 with Bitcoin. WBTC Network.
- Zamyatin, A., Harz, D., Lind, J., Panayiotou, P., Gervais, A., & Knottenbelt, W. (2019). XCLAIM: Trustless, Interoperable, Cryptocurrency-Backed Assets. In Proceedings of the 40th IEEE Symposium on Security and Privacy. IEEE.
- Buterin, V. (2022). Why the Future Will Be Multi-Chain, But It Won’t Be Cross-Chain. Vitalik.eth.limo Blog.