What are wrapped tokens, and what actually backs them?

You swap some ETH on a DeFi app and get back something called WETH. Or you see "Bitcoin" on Ethereum and wonder how it got there, since Bitcoin has its own blockchain. Both are wrapped tokens: tokens that stand in for another asset, 1:1, on a chain or in a format the original can't use directly. A wrapped token is only as good as whatever holds the original asset. Here's how wrapping works, the three ways wrapped tokens are backed, what has gone wrong before, and how to check one before you hold it.

Last updated: October 2026

What are wrapped tokens?

Wrapped tokens are tokens that represent another crypto asset at a 1:1 ratio. The original asset is locked somewhere, and an equal amount of the wrapped version is created. When you unwrap, the wrapped token is destroyed ("burned") and the original is released.

Think of it as a coat-check ticket. The ticket isn't your coat, but it's worth exactly one coat as long as the cloakroom still has it and lets you collect it.

Why wrapping exists

Blockchains and apps only understand certain token formats. Most Ethereum apps are built around the ERC-20 token standard, but ETH itself is older than ERC-20 and doesn't follow it. Bitcoin can't run on Ethereum at all. Wrapping solves both problems:

• Same chain, different format. WETH lets ETH behave like any other ERC-20 token in DeFi apps. Around 3% of all circulating ETH sits in the WETH contract.
• Different chain. WBTC lets Bitcoin be used in Ethereum lending, trading, and liquidity pools.

The trade-off is that a wrapped token isn't the native coin. For example, you can't pay Ethereum gas fees with WETH. You still need some plain ETH in your wallet for that.

How wrapping and unwrapping work

The flow is the same whatever the token:

1. You hand over the original asset (to a smart contract, a custodian, or a bridge).
2. That holder mints the same amount of the wrapped token to you.
3. To get the original back, you return the wrapped token, it's burned, and the original is released.

Wrapping isn't free. Every step is a transaction, so you pay network fees, and some custodians add a minting or redemption fee on top.

In Coin98 Super Wallet, a multichain wallet holds a separate address on each network. That's why the same token, such as USDT or ETH, can appear more than once: one balance per chain, and often a native version and a wrapped or bridged version.

What actually backs a wrapped token?

What backs a wrapped token is the original asset, held by whoever did the wrapping. The useful question is: if you wanted to swap this back for the real asset tomorrow, who would have to say yes? The answer splits wrapped tokens into three groups.

Smart contract: WETH

WETH is the simplest case. You send ETH to the WETH contract, it mints the same amount of WETH, and it gives the ETH back whenever you return WETH. No company sits in between, and nobody can refuse a redemption. The main risks are a bug in the contract (the canonical one has been in use for years) and accidentally using a different token that just borrows the WETH name.

Custodian: WBTC and cbBTC

WBTC is Bitcoin held by custodians, with one WBTC minted on Ethereum for each BTC in custody. Only identity-verified institutions, approved through the project's governance, can mint or burn it. Regular users buy and sell WBTC on the market rather than redeeming directly. About 119,000 WBTC were in circulation in April 2026, and it has been live since January 2019.

cbBTC works the same way but has a single issuer, Coinbase, which launched it on Ethereum in September 2024. With custodial tokens you're trusting a company's reserves and its willingness to redeem. Proof-of-reserves pages let you check that the Bitcoin exists, but they can't guarantee that redemption will stay open.

Bridge: tokens moved to another chain

When you bridge an asset to another chain, the bridge usually locks the original on the source chain and mints a copy on the destination chain. That copy is a wrapped token, even if its name doesn't say so. It's backed only as long as the locked funds stay locked. A native token issued directly on a chain, such as USDC issued by its own issuer there, doesn't carry this extra layer.

Across all three models, wrapped tokens add up to a lot of money: their combined market cap was above $33 billion in April 2026, with WBTC and WETH making up more than half of it.

Are wrapped tokens safe? What can break

Wrapped tokens are as safe as their backing. When the backing holds, a wrapped token trades at the same price as the original. When it doesn't, the copy can lose value fast, while the original asset stays fine on its home chain. Three real events show how.

When a bridge is drained

On 2 February 2022, an attacker exploited a signature-verification flaw in the Wormhole bridge and minted 120,000 wETH on Solana without depositing any ETH, worth about $323 million at the time. For a short period, the wETH on Solana wasn't fully backed. A trading firm connected to the bridge's developer deposited 120,000 ETH the next day to fill the gap. That rescue was a private company's choice, not something the token guaranteed.

In July 2023, roughly $126 million was withdrawn from the Multichain bridge's contracts on 6 July, followed by about $103 million on 10 July. Bridged USDC, USDT, DAI, wETH, and wBTC on Fantom lost their peg, and Fantom-based bridged assets fell 80–90%, while the same assets on their home chains kept their value. We've covered the wider pattern in why cross-chain bridges keep getting hacked.

When custody changes hands

In August 2024, WBTC's original custodian announced it would move custody into a joint venture with a Hong Kong-based custody firm. After pushback, the setup became a 2-of-3 multisig with keys spread across the US, Singapore, and Hong Kong. The Bitcoin didn't go anywhere, but in September 2024 Sky (formerly MakerDAO) voted to phase out WBTC as collateral, citing the change in who controlled it. Custodial tokens carry this kind of governance risk: the backing can stay intact while the terms around it shift.

Fake tokens and wrong networks

Anyone can deploy a token called "WETH" or "WBTC". Copycats can look identical in a wallet but have no backing at all. We'd recommend checking the contract address before you buy or receive any wrapped token.

Sending a token to the wrong network is the other common mistake. ETH on Ethereum and bridged ETH on another chain share a name and a price, but they live on different networks. Sending one to an address on the wrong chain can leave funds stuck or lost.

How to check a wrapped token before you hold it

Checking a wrapped token takes five minutes and covers most of the risk. Run through this list before you hold a meaningful amount.

A five-point check

1. Confirm the contract address. Compare it with the issuer's official site or a reputable token tracker. If your wallet doesn't recognise the token, you can add it as a custom token by selecting the blockchain and pasting the contract address. Then recheck the symbol, name, and decimals.
2. Identify the backing model. Is the original held by a contract, a custodian, or a bridge? Use the table above to see who you're trusting.
3. Look for proof of reserves. Custodial tokens should publish on-chain reserve data you can check yourself.
4. Check the price against the original. A wrapped token trading noticeably below the asset it represents is a warning sign that the market doubts the backing.
5. Ask whether you need it at all. If you're just holding, the native asset on its home chain removes a layer of risk. Wrapping makes sense when you're actively using the asset in an app that needs it.

Moving tokens between networks in Coin98 Super Wallet

If you need a token on another chain, SwapX in Coin98 Super Wallet can convert supported tokens from one network to another, using our SpaceGate bridge and integrated third-party routes. Supported tokens include C98, VIC, SAROS, and ETH, and routes for USDT, USDC, and ETH cover Ethereum, Base, Optimism, and BNB Smart Chain.

Converting costs three types of fee: a protocol fee, a bridging fee, and the network fee charged in each chain's native coin. You'll need a multichain wallet to convert between networks. Some tokens also have per-transaction limits. C98, for example, converts in amounts from 10 to 49,999 per transaction.

FAQ

Is a wrapped token the same as the original coin? No. It represents the original at a 1:1 ratio and usually trades at the same price, but it's a separate token on a separate contract or chain. Its value depends on the original asset still being held and redeemable. You also can't use a wrapped token for things only the native coin does, like paying gas.

Can I pay gas fees with WETH? No. Ethereum gas fees are paid in native ETH, so we suggest keeping a small ETH balance even if most of your holdings are in WETH. You can unwrap WETH back into ETH through the WETH contract, which costs a network fee.

How do I unwrap WETH? Send WETH to the official WETH contract through a wallet or app that supports unwrapping. The contract burns the WETH and returns the same amount of ETH. Some swap interfaces also offer WETH-to-ETH at a 1:1 rate. Either way, check that you're using the official contract.

Is wrapped bitcoin safe? It depends on the custodian. WBTC and cbBTC are backed by Bitcoin held by custodians, so you're trusting their reserves, security, and willingness to redeem. That's a different risk from holding native BTC in your own wallet.

What's the difference between WBTC and cbBTC? Both are custodial wrapped Bitcoin on Ethereum and other chains. WBTC launched in 2019 and is held by a group of custodians under a 2-of-3 multisig, with minting limited to approved merchants. cbBTC launched in 2024 and is issued and held by a single company.

What happens to my wrapped token if a bridge is hacked? If the locked originals are stolen, the wrapped copies on the other chain lose their backing and can fall sharply in price. Holders are made whole only if someone refills the reserves, as a backer did after the Wormhole exploit in 2022. After the Multichain incident in 2023, Fantom-bridged assets lost most of their value.

The short version

Wrapped tokens make crypto more useful, letting ETH work in ERC-20 apps and Bitcoin move into DeFi. But every wrapped token is a claim on something held elsewhere, so the real question is who holds it and what happens if they can't pay out. Check the contract, know the backing model, and hold native assets when you don't need the wrapper. Coin98 Super Wallet keeps each network's balances separate and lets you convert supported tokens between chains with SwapX.