Wrapped tokens let you use one blockchain's asset on a different blockchain or within a DeFi protocol that doesn't natively support it. They're one of the most common things you encounter in DeFi — and one of the most misunderstood.
The Core Concept
A wrapped token is a 1:1 representation of another asset, issued on a different chain or as a different token standard.
You lock the original asset somewhere (a smart contract, a custodian), and receive a wrapped version that you can use in DeFi. When you want the original back, you burn the wrapped token and unlock the original.
wBTC (Wrapped Bitcoin)
The most prominent example. Bitcoin doesn't have smart contract functionality. To use BTC in Ethereum DeFi (as collateral on Aave, in Uniswap pools), it needs to be represented as an ERC-20 token.
How it works:
- Custodian (BitGo, for wBTC) holds real BTC
- Issues wBTC ERC-20 tokens 1:1 on Ethereum
- You can use wBTC in any Ethereum DeFi protocol
- Redeem wBTC → get BTC back from the custodian
Risk: Custodian risk. If BitGo were compromised or became insolvent, wBTC holders would face losses. This is a centralized trust dependency in otherwise decentralized DeFi.
In 2024, BitGo's custody arrangement changed (partial move to a Justin Sun-affiliated entity), which triggered significant wBTC → tBTC migrations among risk-conscious DeFi protocols.
wETH (Wrapped Ether)
Slightly different use case. ETH is Ethereum's native asset, but many DeFi protocols use the ERC-20 standard for all tokens. Since native ETH isn't an ERC-20, wETH wraps it to conform to the standard.
How it works:
- Send ETH to the wETH contract
- Receive equal wETH (ERC-20)
- 1:1 redeemable at any time, no custodian — it's a smart contract
wETH is fully decentralized (no custodian, just a smart contract). Most DeFi interfaces wrap ETH automatically when needed. You rarely see this explicitly unless you're interacting with contracts directly.
wSOL (Wrapped SOL)
Same pattern on Solana. Solana's native SOL isn't an SPL token (Solana's token standard). wSOL wraps it to work with SPL-based DeFi protocols.
Like wETH, wSOL wrapping/unwrapping is done by a smart contract, no custodian. Most Solana wallets and DEXes handle this automatically.
Cross-Chain Wrapped Tokens
More complex and riskier: wrapping an asset from one chain to use on another.
Example: Bridge ETH from Ethereum to Solana. You get "ETH (Wormhole)" or "ETH (Portal)" on Solana — a wrapped version backed by locked ETH on Ethereum, maintained by the bridge.
Risk: Bridge security. Bridge hacks have been among the largest DeFi losses: Wormhole ($320M in 2022), Ronin ($625M in 2022). Cross-chain wrapped tokens inherit bridge risk — if the bridge is hacked, the wrapped version on the destination chain loses its backing.
Checking What You're Holding
When you receive a token on a new chain after bridging, verify:
- Is it the canonical (official) version or a third-party wrapped version?
- What bridge is backing it?
- Is there sufficient liquidity to redeem it?
On Solana, USDC bridged via Wormhole (Solana USDC from Ethereum) is different from native USDC issued by Circle on Solana. The Circle-native version has no bridge risk.
Risk Summary
| Token | Custodian/bridge risk | Decentralization | |---|---|---| | wETH | None (smart contract) | High | | wSOL | None (smart contract) | High | | wBTC | BitGo custody | Low | | tBTC | Threshold Network (decentralized) | Medium-high | | Cross-chain wrapped | Bridge smart contract | Varies |