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Home » Blog » How To Validate Bridging Transactions With Oracles | Cross-Chain Security Guide
Guide & Crypto Education

How To Validate Bridging Transactions With Oracles | Cross-Chain Security Guide

Gixona
Last updated: 28/09/2025 1:26 PM
Gixona
4 months ago
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Disclosure: We are not a registered broker-dealer or an investment advisor. The services and information we offer are for sophisticated investors, and do not constitute personal investment advice, which of necessity must be tailored to your particular means and needs. !
How To Validate Bridging Transactions With Oracles | Cross-Chain Security Guide
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In this article, I will explain the use of oracles in validating bridging transactions, which is fundamental in securing and verifying the transfer of assets from one chain to another .

Contents
  • What is a Bridging Transactions?
  • How To Validate Bridging Transactions With Oracles
    • This is how the process of validation takes place:
    • 1. The Transaction Commencement
    • 2. Oracle Event Monitoring and Confirmation
    • 3. Signing the Message and Reaching Consensus
    • 4. Cross-Chain Communication
    • 5. Final Validation and Execution
    • 6. Security and Redundancy
  • What Platforms Use Oracles for Bridge Validation?
    • LayerZero
    • Axelar
    • Wormhole
  • Role of Oracles In Bridging
  • Future of Oracle-Based Validation
    • 1. Lower Trust Requirements & More Decentralization
    • 2. Incorporation of ZK-Oracles (Zero-Knowledge Proofs)
    • 3. Cross-Chain Protocol Interoperability and Standardization
    • 4. Logic Validation From Oracles Embedded On-Chain
    • 5. Enhanced Oracle Security Using AI-ML Technologies
  • Why Do Bridging Transactions Need Validation?
  • Conclusion

As more blockchain systems are integrated, validating transactions with the help of oracles mitigates the risk of fraud and other malpractices like double spending and transaction mismatches.

We will outline the function of oracles, how they operate, and what measures are taken to maintain dependable cross-chain interactions.

What is a Bridging Transactions?

Bridging transactions involve moving digital assets like tokens or NFTs from one blockchain network to another. Each blockchain operates independent of the others. Therefore, there are no direct means of communication between them.

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This prompts the need for specialized protocols or “bridges” that operate by locking an asset on the source chain and minting or releasing an equivalent asset on the destination chain.

Such processes enable cross-chain interoperability and users are able to utilize their assets across different blockchain ecosystems—such as employing Ethereum-based tokens on the Binance Smart Chain.

Bridging transactions are required to be validated to confirm that the original asset was authentically locked before its representation on the target chain is issued.

How To Validate Bridging Transactions With Oracles

Chainlink CCIP (Cross-Chain Interoperability Protocol) is a cross-blockchain oracle network that facilitates inter-blockchain token and message exchanges while ensuring secure transaction validation and relaying through oracles.

How To Validate Bridging Transactions With Oracles

This is how the process of validation takes place:

1. The Transaction Commencement

A user sends a token from Chain A (let’s say it is Ethereum) to Chain B (let’s say Avalanche) using a CCIP smart contract. This contract will lock the tokens and emit an event notifying the intended transfer.

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2. Oracle Event Monitoring and Confirmation

Chainlink’s decentralized oracle network (called the CCIP Off-Chain Reporting v2 (OCR2) network) has listeners for events in Chain A. The oracles confirm the transfer event as well as the sender’s address, token count, and the chain where the token should be sent.

3. Signing the Message and Reaching Consensus

A number of independent oracles arrive at consensus on the transaction. After reaching this conclusion, they each sign a validated message with the event data, providing proof of the transaction on Chain A.

4. Cross-Chain Communication

Using CCIP’s infrastructure, Chainlink facilitates sending the validated message to Chain B. Chainlink maintains the routing order with its CCIP Messaging Router, which ensures messages are sequenced, unique, secure, and no duplicates exist.

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5. Final Validation and Execution

A CCIP contract on Chain B performs the final validation by checking the oracle-signed message. If everything checks out, the appropriate function is triggered that releases or mints the tokens on Chain B, thus finalizing the bridge.

6. Security and Redundancy

As an additional safeguard, CCIP encompasses a separate layered oracle known as Risk Management Network which monitors cross-chain communications for suspicious or malicious activities.

What Platforms Use Oracles for Bridge Validation?

LayerZero

LayerZero is an omnichain interoperability protocol that allows for direct cross-chain communication. It employs a two-stage validation approach utilizing an oracle such as Chainlink and a relayer.

For every transaction undertaken on the source chain, Layer Zero’s endpoint is responsible to transmit the data to the destination chain. It fetches the block header and Chainlink fetches transaction proof.

LayerZero

The contract on the destination chain checks if both components are provided and if both are valid. This ensures dual-verification which helps maintain secure, trust-minimized communication without the need for a middle chain.

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Axelar

Axelar achieves secure cross-chain communication through a network of validators arranged in a decentralized manner, working like an oracle system. For every bridging transaction, Axelar validators keep track of the source chain and verify the transaction event.

After all validators reach consensus, they generate a signed message which is sent to the destination chain. There, the smart contract will only consider this message if a predetermined number of validators signed it, guaranteeing decentralized validation.

Axelar

Trustless secure cross-chain asset and data transfer is thus ensured. With Axelar, developers can utilize General Message Passing (GMP) for complex logic beyond straightforward token transfers.

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Wormhole

Wormhole is a cross-chain messaging protocol utilizing a decentralized set of guardian nodes which act as validators and oracles. Guardians track events on the source chain, issue attestations, which relay signed proof of the transaction to the designated chain.

Smart contracts on Wormhole are programmed to check the attestations against a quorum of guardians for validity. Accepted attestations trigger the specified action, which can be the minting or unlocking of tokens.

Wormhole

With the guard system, Wormhole ensures not only security and liveness but also extends beyond simple token bridging to cross-chain governance and NFT exchange.

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Role of Oracles In Bridging

Event Surveillance on Source Chain Oracles watch over smart contracts on the source blockchain for bridge event contracts, like lock, burn, or transfer.

Verification of Transaction Oracles check the event’s authenticity by validating the transaction parameters (hash, sender address, token, and destination chain).

Building Consensus In a decentralized oracle network, multiple oracles independently validate and reach consensus on the transaction before further processes to reduce fraud risk.

Generating Proof Oracles create cryptographic signatures and proof which confirms an event occurred on the source chain.

Cross-Chain Message Transmission Oracles transmit data to the destination chain using secure messaging protocols such as Chainlink CCIP and LayerZero ULN.

Smart Contract Activation on Destination Chain The destination bridge contract, after receiving the confirmed message, checks the oracle’s proof and takes action like minting or releasing tokens.

Future of Oracle-Based Validation

1. Lower Trust Requirements & More Decentralization

  • An oracle network will become more decentralized which will reduce reliance on a single entity or vendor.
  • Future bridges will increasingly use multi-oracle consensus models for validation trust reduction, enhancing security while minimizing trust assumptions.

2. Incorporation of ZK-Oracles (Zero-Knowledge Proofs)

  • Oracle use of ZK technology can prove an event occurred without revealing sensitive data.
  • This significantly enhances privacy, scalability, and trustlessness in cross-chain validation.

3. Cross-Chain Protocol Interoperability and Standardization

  • The adoption of universal standards by all industries will improve universal chain compatibility (ex. IBC or CCIP).
  • Oracles will be essential for enforcing standards and validating compliant transactions across various protocols.

4. Logic Validation From Oracles Embedded On-Chain

  • Validation logic of an oracle will be increasingly enforced on-chain through smart contracts which will increase the automation and transparency of the validation process.
  • Reduced dependency on off-chain components increases auditability and reduces overall attack surfaces.

5. Enhanced Oracle Security Using AI-ML Technologies

  • AI and machine learning technologies will improve oracle network abnormality detection.
  • This will enable the detection of unusual behaviors or attempts to exploit bridging transactions in real time.

Why Do Bridging Transactions Need Validation?

Validation on bridging transactions is important in confirming whether assets are genuinely locked or burned on the source blockchain before the process of minting or releasing on the destination chain occurs.

This process safeguards against critical security problems such as double-spending, where the same asset can be exploited on both chains, as well as fraud or malicious behavior. It also maintains trust in operations across chains by ensuring there is no loss of information or accuracy over systems.

Bridging protocols require proof of the original transaction which confirms the transfer is genuine and trustable, allowing safe asset transfers across different blockchain networks.

Conclusion

In summary, confirming bridging transactions with oracles guarantees secure cross-chain asset transfers with minimal trust. Oracles eliminate fraud, double spending, and data inconsistencies by verifying events on the source chain and proving them to the destination chain.

Along with growing interoperability, oracle validation is crucial for constructing decentralized, scalable bridges through blockchain ecosystems to cultivate a multi-chain future.

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