Blockchain. Blockchain bridges

Simran Advani

Tue May 30 2023

Simran Advani

What is a Blockchain Bridge?

Blockchain bridges are programs or systems that make it easier for multiple blockchain networks to interact and communicate with one another. They serve as connectors, enabling the exchange of resources, information, and data between various blockchains.

The problem of separated blockchain ecosystems, where one network runs separately and lacks seamless contact with others, is greatly helped by blockchain bridges. Users can get over the constraints of individual blockchains and open up new avenues for decentralized applications, cross-chain transactions, and shared resources by building bridges.

To enable the transmission of assets or information from one blockchain to another, these bridges frequently use smart contracts, specialized nodes, or relay mechanisms. Throughout the procedure, they make sure the transferred assets are safe, verifiable, and tamper-proof.

Top 4 Blockchain bridges

1. Multichain

Multichain technology acts as a versatile blockchain bridge, enabling seamless interoperability and scalability across multiple blockchain networks. Bridging different chains unlocks new possibilities for decentralized applications, cross-chain asset transfers, and efficient communication between disparate blockchain ecosystems. Embracing multichain solutions paves the way for a more connected and efficient blockchain ecosystem, driving innovation and unlocking the full potential of distributed ledger technology.

2. Portal Tokens Bridge

A cross-chain technology called Portal Token Bridgesupports over 20 networks, including BNB Smart Chain, Polygon, Optimism, and Arbitrum. When Portal was first constructed, it was known as the Wormhole Bridge and was intended to link Solana and Ethereum. The Wormhole label now refers to the underlying protocol that powers the bridge, which has been renamed Portal Token Bridge since then.

The bridge is protected by a network of 19 nodes known as guardians and uses the locking-and-minting process. Large-scale institutional staking service providers like Everstake and Jump Crypto, which have participated in Solana staking actively and are seen as reliable by the platform, are frequently these guardians. When it comes to sanctioning transfers, each of them carries equal weight.

3. AllBridge

AllBridge is a quick, inexpensive, and safe solution to transfer cryptocurrency between several blockchains. More than 20 networks, both EVM and non-EVM ones, are supported by the bridge. The protocol is anticipated to implement L2 networks like Optimism and Arbitrum and enable NFT transfer soon. Three primary products are available on the platform: Allbridge Classic, Allbridge Core, and Allbridge BaaS. Below, we'll take a deeper look at each of them.

Allbridge utilizes the mint-and-lock process, just like Multichain, and for some stablecoins, it makes use of liquidity pools on several networks. The latter is Allbridge Core, which enables users to bridge (swap) USDT, USDC, and BUSD across Ethereum, Binance Smart Chain, and other platforms. The former falls under the Allbridge Classic product line.

4. ChainPort

Chainportis a permissionless bridge with a security-focused architecture that supports the porting of 100 different assets between more than 10 networks, including L2 networks like Arbitrum and Optimism as well as EVM-compatible ones like BNB Chain and Polygon as well as Cardano. By the end of 2023, the bridge will double the number of supported networks to more than 20, according to its roadmap, and include additional functions, including NFT porting.

The protocol prioritizes security above all else and has strong, tried-and-true security measures. These features consist of numerous independent security audits, multi-signature and MPC cold wallets, and funds segregation.

Blockchain Bridges: How Do They Operate?

Blockchain bridges enable interoperability between various blockchain networks by building a channel for the movement of assets and information. Each of the bridge's participating blockchain networks uses a unique consensus algorithm, such as Proof of Work or Proof of Stake, to operate. Assets are locked on the source chain when they need to be moved from one blockchain to another. This protects against double spending or other fraud during the transfer process.

The locked assets on the source chain are verified by validators, which serve as middlemen or specialized nodes. They make if the assets are real, legitimate, and transferable. To make the transfer possible, smart contracts are set up on both the source and destination blockchains. These agreements control the locking, asset unlocking and cross-chain asset validation.

Following verification and validation, the locked assets are released on the destination chain so that users on the target blockchain network can access and use them. Blockchain bridges frequently use methods like cross-chain communication protocols, relay chains, or interoperability layers to preserve consistency across chains. By synchronizing the state of the bridging chains, these techniques guarantee precise asset transfers and consistent data.

Bidirectional transfers are supported by some bridges, enabling the movement of assets back and forth between blockchains. This increases adaptability and allows for smooth communication across various blockchain networks. In general, blockchain bridges are essential for facilitating cross-chain interoperability, extending the use of blockchain applications, and maximizing the promise of decentralised finance (DeFi), asset transfers, and other blockchain-based services.

Blockchain Bridges: Trust-Based vs. Trustless

Centralization is a hidden drawback of blockchain bridges. If users want to exchange their coins for other cryptocurrencies, they must relinquish ownership of their money, putting it in the hands of a third party. This is how wrapped tokens, like wBTC, are created, if you've ever seen one. The concept is to take your Bitcoin and "wrap" it in an ERC 20 contract so that it behaves like an Ethereum token.

When you need to move a lot of cryptocurrencies, trust-based bridges are a quick and affordable choice, but the number of trustworthy services is fairly limited. Smaller traders find it unattractive to venture into the region of lesser-known brands because doing so can increase risks.

Decentralized blockchain bridges, also known as trustless bridges, exist with the goal of enhancing user confidence when transferring their currency. Individual networks contribute to the transaction validation process in these systems, making them function just like a real blockchain. Using a trustless bridge will ease your mind if you're concerned that your coins will end up in the wrong hands. Decentralized bridges have the drawback of being a freelance-based service. Due to the fact that they are simply compensated to fulfill your request and not to remedy problems, this might become a liability when mishaps occur.

Selection of a Bridge

Here are a few of the most well-known blockchain bridges for cryptocurrency transfers.

  • Binance Bridge: One of the broadest collections of tradeable cryptocurrencies is available on this decentralized bridge. It supports a number of well-known blockchains, including TRON, Solana, and Ethereum.

  • cBridge: If you don't want to use its primary bridge, you can use this solution straight from Binance. You can interact with a multitude of blockchains and cryptocurrencies, just like with any trustless bridge. The fact that you must first link a wallet before doing anything is a minor drawback of cBridge.

  • AnySwap: This platform is well known for having functions other than transferring cryptocurrency. You can view your entire balance for all of your different currency kinds once you're connected to a wallet. Balances may also be easily transferred from one location to another. However, in some blockchains, you can only send money in one direction if you wish to send money.

  • How secure are blockchain bridges?

    Approaches that are both trusted and trustless may be flawed on a basic or technical level. To be more exact, a trustless bridge is susceptible to vulnerabilities that come from the program and the underlying code, but the centralization feature of a trusted bridge exhibits a fundamental defect. Simply said, if the smart contract has a defect, parties with ulterior motives will almost certainly try to exploit it.


    Blockchain bridges make it easier to move information and money between various blockchains. Token porting to a different blockchain can help with scalability problems and fee reduction.

    Custodial and trustless blockchain bridges are the two most common forms. Trustless bridges run on a network of smart contracts, while custodial bridges have a central authority protecting cash.

    For DeFi protocols, DApps, and Web3 gaming projects, blockchain bridges present a number of opportunities. To ensure your money is secure, you must consider the risks connected to each bridge and take the necessary precautions.

    Unlocking the potential of decentralized finance and seamless connectivity, blockchain bridges are reshaping the crypto landscape for a borderless and interconnected future.

    Blockchain bridges

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