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A link contract is an approach to data control in a distributed data sharing network. Link contracts are a key feature of the XDI specifications under development at OASIS. In XDI, a link contract is a machine-readable XDI document that governs the sharing of other XDI data.

Step 1: Deploy an Oracle Contract to Kovan.Step 2: Build a New External Adapter.Step 3: Register Adapter URL in a New Chainlink Node.Step 4: Create a Job Specification for the external adapter.Step 5: Register the Chainlink node in the Oracle contract.Step 6: Create a requester contract to submit a request.

Chainlink tokens?called LINK?serve as currency to pay Chainlink network operators for retrieving and preparing off-chain data and performing computations.

Chainlink is a decentralized network of nodes that provide data and information from off-blockchain sources to on-blockchain smart contracts via oracles. This process, along with extra secure hardware, eliminates the reliability issues that might occur if using only a single centralized source.

Smart contracts are pre-specified agreements on the blockchain that evaluate information and automatically execute when certain conditions are met. LINK tokens are the digital asset token used to pay for services on the network.

Chainlink (LINK) is a cryptocurrency and technology platform that enables non-blockchain enterprises to securely connect with blockchain platforms. Chainlink is middleware that connects blockchain-based smart contracts with external data, such as baseball scores or stock prices.

OpenZeppelin is an open-source framework to build secure smart contracts. OpenZeppelin provides a complete suite of security products and audit services to build, manage, and inspect all aspects of software development and operations for decentralized applications.

LINK tokens are used to pay node operators for retrieving data for smart contracts and also for deposits placed by node operators as required by contract creators. The smallest denomination of LINK is called a Juel, and 1,000,000,000,000,000,000 (1e18) Juels are equal to 1 LINK.

OpenZeppelin provides a complete suite of security products to build, manage, and inspect all aspects of software development and operations for Ethereum projects. Contracts A library of modular, reusable, and secure smart contracts, written in Solidity.

OpenZeppelin Contracts features a stable API, which means that your contracts won't break unexpectedly when upgrading to a newer minor version.