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Wrapped tokens represent assets from one blockchain on another — like Wrapped Bitcoin (WBTC) on Ethereum. Here's how they work and the trust assumptions.
This guide is designed for first-pass understanding. Start with core terms, then apply the framework in your own account workflow.
If you've ever tried to use Bitcoin in a DeFi protocol on Ethereum, you've run into the problem that wrapped tokens solve. Blockchains don't natively talk to each other, so a Bitcoin can't just appear on Ethereum. Wrapped tokens are the workaround; and they're one of the most important (and underappreciated) pieces of infrastructure in crypto.
A wrapped token is a cryptocurrency that represents an asset from one blockchain made compatible with another blockchain, backed 1:1 by the original asset locked in a smart contract or custodial reserve. For example, Wrapped Bitcoin (WBTC) is an ERC-20 token on Ethereum backed by real BTC, allowing Bitcoin holders to participate in Ethereum DeFi without selling their Bitcoin. Wrapped ETH (WETH) makes native ETH compatible with the ERC-20 standard used by most DeFi protocols.
Each blockchain is its own isolated world. Ethereum doesn't know what's happening on Bitcoin. Solana doesn't know what's happening on Ethereum. They have different rules, different token standards, and different virtual machines. A Bitcoin is a UTXO on the Bitcoin network; it simply cannot exist as an ERC-20 token on Ethereum.
But the DeFi ecosystem on Ethereum is enormous; lending, borrowing, trading, yield farming — and Bitcoin holders want access to it without selling their BTC. Similarly, developers want liquidity from other chains to flow into their protocols.
A wrapped token is a representation of an asset from one blockchain that's been made compatible with another blockchain. It's backed 1:1 by the original asset, which is locked up somewhere, and the wrapped version follows the token standard of its new home chain (like ERC-20 on Ethereum or SPL on Solana).
Wrapped Bitcoin (WBTC) is the most well-known wrapped token. Here's how it works:
At its peak, over 150,000 BTC (billions of dollars) were wrapped as WBTC. It became the primary way Bitcoin holders participated in DeFi. But the model has a fundamental weakness: you're trusting a custodian. If the custodian mismanages the reserves, gets hacked, or goes out of business, your WBTC could become worthless.
In 2024, BitGo's decision to share WBTC custody with Justin Sun's entities sparked a controversy that led major DeFi protocols to reconsider their WBTC exposure. This episode highlighted exactly why custodian risk matters.
A wrapped token is a cryptocurrency token pegged to the value of another asset, allowing it to be used on a different blockchain. Wrapped Bitcoin (WBTC) is an ERC-20 token on Ethereum backed 1:1 by real Bitcoin held in custody. It lets you use Bitcoin in Ethereum DeFi protocols.
Bitcoin's blockchain has limited programmability — you can't use BTC directly in Ethereum DeFi protocols. Wrapping BTC into WBTC lets you lend it on Aave, provide liquidity on Uniswap, or use it as collateral — things Bitcoin's native chain doesn't support.
The main risk is custodial trust — you're trusting that the custodian (like BitGo for WBTC) actually holds the underlying asset. If the custodian is compromised or insolvent, the wrapped token could lose its peg. Smart contract bugs in the wrapping mechanism are another risk.
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Here's a weird one: ETH needs to be wrapped to work in many Ethereum DeFi protocols, even though it's Ethereum's native currency. Why?
The ERC-20 token standard was created after Ethereum launched. ETH itself predates ERC-20 and doesn't conform to it. DeFi smart contracts are built to interact with ERC-20 tokens — they expect standard functions like transfer(), approve(), and transferFrom(). Native ETH doesn't have these functions.
Wrapped ETH (WETH) solves this by wrapping native ETH into an ERC-20 compatible token. You deposit ETH into the WETH smart contract and receive WETH in return, 1:1. Unlike WBTC, there's no custodian; it's a simple, audited smart contract. You can unwrap back to ETH at any time.
Modern DeFi interfaces often handle wrapping and unwrapping automatically. When you trade on Uniswap, you might be swapping WETH behind the scenes even though the UI shows ETH. But it's useful to understand what's happening under the hood, especially when you see WETH in your wallet and wonder why it's not just ETH.
There are two primary models for wrapping tokens:
A hybrid approach exists too. Some bridge protocols use multisig wallets (requiring multiple parties to approve transactions) or decentralized validator sets to custody assets. These reduce the trust placed in any single party but introduce their own complexity.
Using wrapped tokens involves tradeoffs compared to native tokens:
WBTC deserves special attention because it's the largest wrapped asset and its custody model has real implications. The original WBTC system relied on a DAO and BitGo as the primary custodian. In 2024, custody was restructured to include entities associated with Justin Sun, a controversial figure in crypto.
This led to immediate concerns:
The WBTC situation illustrates a fundamental tension in wrapped tokens: the more centralized the custodian, the simpler the system; but the greater the single point of failure. For holders, it's important to understand who is custodying the underlying assets and what safeguards exist.
The crypto industry is actively working on alternatives that reduce or eliminate the trust assumptions of wrapped tokens:
From a portfolio perspective, wrapped tokens add complexity. Your WBTC on Ethereum is economically equivalent to BTC, but it shows up as a separate token in your wallet. If you have BTC on a hardware wallet, WBTC in a DeFi lending protocol, and cbBTC in another position, you actually have three different representations of the same underlying asset.
Good portfolio tracking tools understand this. Clarity aggregates your holdings across wallets and exchanges, recognizing that WBTC, cbBTC, and native BTC all represent Bitcoin exposure. This gives you an accurate picture of your true allocation rather than a fragmented view of a dozen different token names.
A few pitfalls to watch out for:
If you're holding wrapped tokens, take a few minutes to understand what's backing them. For WETH, the risk is minimal — it's just a smart contract wrapper. For WBTC and other custodially-backed wrapped tokens, research the custodian and consider whether alternatives like tBTC or cbBTC better match your risk tolerance.
Keep track of all your wrapped and native token positions in one place. Clarity connects to your wallets and exchanges to show you exactly what you hold, where it lives, and what it's worth — cutting through the complexity of wrapped tokens, multi-chain positions, and DeFi protocols. Understanding your true exposure across all forms of an asset is the first step to managing risk effectively.
Cryptocurrency investments are volatile and carry significant risk. This article is educational and does not constitute financial advice. Do your own research before investing.