# Glossary

#### **DAPP (Decentralized Application)**

A software application that operates on a decentralized network such as blockchain.

#### Signature Proof (ECDSA Proof)

ECDSA (Elliptic Curve Digital Signature Algorithm) Proof is a cryptographic method used to verify the authenticity and integrity of digital messages or data. It involves generating a digital signature using a private key and verifying it with a corresponding public key. ECDSA is widely employed in securing transactions and ensuring data integrity in various applications.

#### Pricefeed

Real-time and accurate data feed of asset prices are essential for decentralized applications (DApps) and financial transactions such as trading and lending.

#### Payload

Data is transmitted in a communication protocol or across different systems. \
Example: In xOracle's Cross-chain Message service, payload refers to the actual message being transmitted between source and destination chains.

#### Relayer Node

An intermediary node is responsible for transmitting data between different components within a blockchain ecosystem.

#### Pricefeed Signer Node

The node is responsible for fetching price data from off-chain sources and signing it to prevent tampering with the price data.

#### Messenger Signer Node

The node signs message data in cross-chain communication to ensure authenticity and integrity, preventing tampering.

#### xOracle Chain

The xOracle Chain is a blockchain network tailored for supporting its decentralized oracle and cross-chain communication services. It securely stores price data and messages, making them available for verification by all participants.


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