Wrapped Token
By Menno — 13 years in crypto, 3 bear markets survived, zero paid promotions
Last updated: March 2026
A wrapped token is a tokenized representation of an asset from one blockchain that can be used on another. WBTC (Wrapped Bitcoin) on Ethereum is the most prominent example — each WBTC is backed 1:1 by BTC held in custody.
Wrapped tokens bridge the liquidity of one blockchain ecosystem to another. Bitcoin can't natively run on Ethereum smart contracts (different virtual machines, different consensus rules), but WBTC brings Bitcoin liquidity into the Ethereum DeFi ecosystem. WBTC (launched January 2019) uses a custodian model: merchants request minting by depositing BTC with BitGo, which mints an equal amount of WBTC ERC-20 tokens. The process is transparent — all WBTC mints, burns, and BTC reserves are published on-chain and verifiable. By 2024, WBTC had over 150,000 BTC locked (~$8–10B), making it one of the most significant custodial bridges in crypto.
The ETH-to-WETH conversion is simpler: Wrapped ETH (WETH) is ETH 'wrapped' into an ERC-20 token on its own chain. Because ETH predates the ERC-20 standard, it doesn't conform to ERC-20 itself. Most DeFi protocols expect ERC-20 tokens, so users deposit ETH into the WETH contract to receive an equal amount of WETH, which they can use in Uniswap, Aave, and other protocols. Unwrapping is free except for gas. Some protocols (like Uniswap V4) are adding native ETH support to eliminate this friction.
Not all wrapped tokens are custodially backed. Synthetic versions use overcollateralization or algorithmic mechanisms. RenBTC (now defunct) used a decentralized dark node network. tBTC uses distributed custody among randomly selected stakers. The key risk question for any wrapped token is: what happens if the custodian or bridge fails? The WBTC custodian change to BiT Global (Justin Sun-affiliated) in 2024 triggered significant controversy and led MakerDAO to begin depreciating WBTC as collateral.
Frequently Asked Questions
Is WBTC safe to use in DeFi?
WBTC has been battle-tested since 2019 without a hack. The primary risk is custodial — BitGo/BiT Global hold the underlying BTC. In late 2024, the custodian change to a Justin Sun-affiliated entity caused some protocols (MakerDAO) to reduce WBTC exposure. For DeFi use, the risk is considered acceptable for most, but it's a centralization tradeoff vs. native BTC.
What's the difference between WETH and ETH?
ETH is native Ethereum currency; WETH is an ERC-20 wrapper for ETH, needed for DeFi protocol compatibility. They always trade at exactly 1:1 and conversion is instant (wrap/unwrap). The only cost is gas. You'll see both in DeFi — ETH appears in your wallet balance, but WETH may be what DeFi protocols actually hold on your behalf.
Related Terms
Cross-Chain Bridge
A cross-chain bridge is a protocol that allows cryptocurrency tokens to be transferred between different blockchains. Bridges enable assets native to Ethereum to be used on Solana, and vice versa.
ERC-20 Token Standard
ERC-20 is the technical standard that defines how fungible tokens behave on Ethereum and EVM-compatible chains. It specifies a common interface (functions like transfer, approve, balanceOf) that all compliant tokens implement, enabling interoperability across all wallets, DEXes, and DeFi protocols.
DeFi (Decentralized Finance)
DeFi is a category of financial services built on blockchain technology that operates without traditional intermediaries like banks. It includes lending, borrowing, trading, and earning yield through smart contracts.
Stablecoin
A stablecoin is a cryptocurrency designed to maintain a stable value, usually pegged 1:1 to the US dollar. Common stablecoins include USDC, USDT (Tether), and DAI.
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