Chain Fusion Review 2026: ICP's Bridgeless Chain-Key Tokens

Chain Fusion is the Internet Computer Protocol's approach to connecting with other blockchains. Rather than relying on a bridge run by a company or a multisig, it lets ICP smart contracts sign and submit transactions on other chains using threshold signatures.

The main output is chain-key tokens, whose names start with ck, such as ckBTC and ckETH. DefiLlama lists Chain Fusion under Decentralized BTC, on the Bitcoin and Ethereum chains, with about 23.8 million USD in TVL and a listing date of December 2023.

It is a protocol-level feature of the Internet Computer rather than a separate product with its own token. The official URL given is the ICP network dashboard, which describes itself as fully on-chain and reads metrics directly from the NNS, ledgers and system canisters.

Chain Fusion relies on Internet Computer smart contracts, called canisters, that can hold keys through threshold signatures. No single party has the full key. The subnet nodes jointly sign transactions, so a canister can send and receive assets on Bitcoin or Ethereum directly.

When you deposit a native asset, it is held in a wallet controlled by these canisters, and a matching chain-key token such as ckBTC or ckETH is issued on the Internet Computer. The project says each token is backed 1:1 by the native asset and is redeemable at any time. Redeeming burns the token and releases the underlying asset to an address you choose.

Because the tokens live on the Internet Computer, transfers are fast, with about one second finality and negligible fees according to the description. The tradeoff is that your security depends on the network's cryptography and the canister code, not on a bridge company.

Fees are not detailed publicly. The project description says transaction fees on chain-key tokens are negligible, but it gives no figures for minting or redeeming.

Users should expect to pay network fees on the underlying chain, such as Bitcoin or Ethereum, when moving assets in or out. Current costs would be visible in the wallet or interface used, and the Internet Computer dashboard shows network-level metrics.

DefiLlama lists two audits, but the project does not name the auditors or give their findings, so readers should look for the reports directly. The security model uses threshold signatures managed by smart contracts, which avoids a single custodian but depends on correct canister code and the network's cryptography.

Public sources mention no hacks or incidents and no regulatory status. As with any wrapped or synthetic representation of an asset, a flaw in the contracts or signing scheme could affect redemption, so size positions accordingly.

Chain Fusion is for people already using or exploring the Internet Computer who want BTC or ETH on it, and for those who prefer a design with no centralized bridge. It is less relevant to users who only hold assets on Bitcoin or Ethereum and never plan to use ICP applications.