What is wrapped token?

A token on one blockchain that represents an asset held on another, such as wrapped Bitcoin issued on Ethereum.

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A token on one blockchain that represents an asset held on another, such as wrapped Bitcoin issued on Ethereum.

Chains cannot read each other. Bitcoin has no way to know what happens on Ethereum, and an Ethereum contract cannot hold or move a bitcoin. Wrapping bridges that gap by locking the original somewhere and issuing a claim on the destination chain, so an asset that cannot natively exist there can still be used there.

The point people skip is that a wrapped token is a claim on a custodian or a contract, not the asset itself. It trades at parity for as long as that claim is believed.

How it works

Two models dominate. In the custodial model, a company holds the original asset in reserve and mints a matching token on the destination chain, burning it when someone redeems. Wrapped Bitcoin on Ethereum works this way, and its soundness depends entirely on the custodian holding what it says it holds and honoring redemptions.

In the contract model, the lock is enforced by code. A canonical bridge holds deposits in a contract on the origin chain and mints on the destination, so the trust question moves from a company to the bridge's code and its operators.

A third case is not really wrapping at all. Wrapped Ether exists because Ethereum's native currency predates the ERC-20 standard and contracts expect a standard token interface, so a contract accepts ETH and issues an equivalent token on the same chain. There is no other chain and no custodian, only a deposit contract.

Whichever model, the wrapped token's price holds at parity through arbitrage: if it trades below the original, someone buys it and redeems for the real asset. That mechanism depends on redemption working. When it stops, the peg goes with it, and cross-chain bridges have been among the largest single losses in the sector.

Example

Illustrative. You hold 1 BTC and want to use it in an Ethereum lending market.

You send the bitcoin to a custodian, which credits 1 wrapped bitcoin to your Ethereum address. That token behaves like any ERC-20: you can lend it, use it as collateral, or trade it. Redemption reverses the process and returns the bitcoin.

Now suppose the custodian's reserves are questioned. The wrapped token can fall below the price of bitcoin even though nothing happened to bitcoin, because you are no longer holding bitcoin. You are holding a claim, and the claim is what is being repriced.

Why it matters when you buy

If your reason for buying an asset is the asset, the wrapped version adds a party between you and it. That may be a fair trade for access to applications on another chain, and it is a different risk from the one you thought you were taking. The chain pages cover which networks each asset settles on, and the guide on sending crypto across chains covers moving between them.

  • bridge: the infrastructure most wrapping runs on
  • canonical bridge: the chain's official lock-and-mint route
  • custodian: who holds the original in the custodial model
  • peg: the parity a wrapped token maintains
  • proof of reserves: how backing is evidenced
  • erc 20: the standard wrapped tokens usually follow

Questions

Is wrapped Bitcoin the same as Bitcoin?

No. It is a token on another chain representing bitcoin held by a custodian. It usually trades at parity, and it carries the custodian's risk in addition to bitcoin's price risk.

Can I unwrap at any time?

In principle yes, through the issuer's redemption process or the bridge contract. In practice redemption can be restricted by minimums, jurisdiction, or the issuer's own solvency, so check the terms before wrapping a large amount.

Why does wrapped Ether exist on Ethereum itself?

Because native ETH predates the ERC-20 token standard and does not implement it, while most contracts expect that interface. Wrapping converts ETH into a standard token on the same chain, with no custodian involved.

Guides that use this term

  • Layer 1 vs Layer 2: What the Difference Means When You Buy and Move Crypto

    A layer 1 is a blockchain that settles its own transactions, while a layer 2 is a separate network that processes transactions off the main chain and posts them back to the layer 1 for settlement, which matters to you because the same token on two networks costs different amounts to move and does not share a deposit address.

  • How to Send Crypto Across Chains Without Losing It

    Moving crypto between chains means either routing it through an exchange that accepts deposits on one network and withdrawals on another, or using a bridge that locks the asset on the source chain and issues a wrapped version on the destination, and in both cases the mistake that costs people money is picking the wrong network on the send screen.

  • How to Verify a Token Contract Address Before You Buy

    A token's contract address is its only real identity, so verifying one means getting the address from the project's own official channel, confirming the same address independently from a second source, and checking on a block explorer that the contract is what it claims to be before you trade against it.

  • Stablecoins Explained: How They Work and What Can Go Wrong

    A stablecoin is a token built to hold a fixed value, usually one US dollar, and it holds that value either because an issuer keeps cash and short-term government debt in reserve against every token in circulation or because code adjusts supply to chase the peg, and it is the second design that has failed most often.