Provide External Data to Ethereum Smart Contracts with an Oracle Network

With Chainlink on Kaleido you can connect to any external API, send payments anywhere, and more.
What it is

What It Is

Chainlink is a decentralized oracle network used to provide external data to Ethereum smart contracts. Connecting external data allows a contract to have the information from real-world external events, APIs, and other blockchains.

The Chainlink network provides reliable tamper-proof inputs and outputs for complex smart contracts on any blockchain. Smart contracts allow you to execute tamper-proof digital agreements, which are considered highly secure and reliable.

In order to maintain a contracts’ overall reliability, the inputs and outputs which the contract relies on also need to be secure. Chainlinks provide a reliable connection to external data, that is provably secure end-to-end.

Connect to any External API

Connect your smart contracts to the inputs and outputs it needs to reach its full potential.

Send Payments Anywhere

Send payments from your smart contract to payment networks and bank accounts with ease.

Trusted Gateway

Chainlink is built on a network of independent node operators to offer unique integrations.

How it works

How it Works

Chainlink has been popular in the blockchain community with its architecture as a decentralized Oracle technology. Unlike other Oracle designs that rely on a centralized party to be trusted as a gateway, Chainlink is built on a network of independent node operators to offer unique integrations. The node operators are rewarded with the LINK tokens for performing verifiably honest and high-quality work. They can also be punished for being dishonest or turning up a result of poor quality.

The Oracle contract is at the center of the Chainlink design. This is a core aspect of how Chainlink is used in Kaleido blockchain networks.

  • Controls which Chainlink nodes are allowed to fulfill job requests
  • Gateway for client contracts to access the Chainlink network
  • Relays job execution results from the Chainlink network back to the client contract
  • Locks Chainlink node operator deposits as punishment for poor performance

The contract communicates with the Chainlink network nodes by publishing EVM events specifically designed to broadcast client requests for external data or job execution: OracleRequest. The request object contains the job ID, client payment amount, client’s desired job execution parameters, and callback addresses for the client contract to accept job execution results.

More than one Oracle contract may be active in a blockchain network. A Chainlink node operator may choose which Oracle contracts to register with in order to be permitted to handle job requests. A Chainlink client contract may choose which Oracle to send the job request to.

Client Smart Contract

The main consumer of the Chainlink Oracle function is naturally a smart contract. This is what the application developers building enterprise blockchain solutions need to develop.

As described above, a client smart contract is not allowed to interact with the outside world. This must be done by going through a mechanism where the need for the external data is broadcast via transaction events, then an external party that listens for such events gets notified for the request, and grabs the requested data and finally sends it into the chain by calling the smart contract via a transaction.

Why Kaleido

Why Kaleido

Kaleido's platform is different because it has everything businesses need to create complete blockchain solutions. With just a few clicks, you can create a blockchain network, deploy it globally, set up governance, and include additional services.

Blazing Fast Deployment, Speed, and Scale

Deploy Production-Ready Blockchain Networks and Digital Assets in Minutes
Amazingly Low Cost Per Transaction
Multi-Party, Cross-Cloud, and Multi-Region Support
Built-In High Availability and Disaster Recovery
400+ APIs and 40+ Services to Accelerate Development

No Lock-in and Open Source Technologies

Support for Multiple Blockchain Protocols
Enterprise Integrations and Marketplace
Customizable Decentralization Options
Actively Leading New Standards and Technologies

Proven Enterprise Platform and Expertise

ISO and SOC2 Certified
SLAs and  24/7 Support
On-Chain and Off-Chain Services
Secure Key Management
Built-In Monitoring and Smart Contract Management
Additional Resources
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Frequently Asked Questions

Who developed Chainlink?

Sergey Nazarov launched Chainlink in 2017. Chainlink connects the chain to external data sources and contributes to security by verifying contract parameters are met with off-chain sources. Chainlink Labs is a group focused on accelerating the adoption of and innovation around smart contracts. Chainlink Labs publishes research on blockchain technology.

Where does Chainlink get its data?

Chainlink takes data feeds from off the chain and puts the information in a format that the chain can understand. The reason for doing this is simple. Imagine a smart contract calls for an amount of ETH to be paid to a party once a condition is met. When the condition is met, the contract needs to know the value of ETH. Chainlink can be used to pull the value of a token at the time a transaction is made.  This ability to unite off-chain data with on-chain information creates a hybrid smart contract, using the Oracle network to complete more complex chain computations and more agile tasks.

How do Chainlink Nodes Validate Data?

The Chainlink Aggregating Contract can pull data from multiple sources. If the sources differ, the contract can reject faulty values or take the average of those values. The most important part is how Chainlink grabs this data and translates it into language the chain can understand. Chain data is handled differently than real work data, so Chainlink does a lot of the work for a developer in aggregating information.

What is a Link token?

LINK is a cryptocurrency that is used to incentivize node operators. It’s not really used for regular, everyday purchasers. Any network participant that facilitates the transmission of off-chain data to a network can be paid in LINK. LINK is an erc-20 token.