XGBoost

Optimized gradient boosted decision tree library used for tabular ML tasks like fraud detection, with regularization and parallel training support.

XAI, Explainable AI

Methods that make model predictions understandable to humans, including feature attributions and counterfactuals, important for regulated DeFi and identity scoring.

xDai (Gnosis Chain)

EVM sidechain historically branded xDai, now Gnosis Chain; stable, low fee environment often used for payments and DAO operations with bridges to Ethereum.

X-address (XRPL)

Address format that embeds the destination tag with the account on XRPL to reduce misdirected deposits on exchanges and services supporting tags.

XRPL, XRP Ledger

Public blockchain focused on fast settlement and issued assets, using a Byzantine agreement style consensus among validators rather than mining or staking.

XCMP, Cross-Chain Message Passing

Mechanism for direct communication between Polkadot parachains, enabling trust minimized cross chain function calls and asset transfers coordinated by the relay chain.

XCM, Cross-Consensus Messaging

Polkadot framework for sending messages and assets between parachains and external systems, designed to be agnostic to consensus specifics while preserving safety.

xprv, Extended Private Key

BIP32 private root that can derive the entire HD wallet keychain; compromise of an xprv exposes all descendant keys, must be stored with strong protection or hardware isolation.

xpub, Extended Public Key

BIP32 key that allows derivation of child public keys without private keys; useful for watch-only wallets and address discovery, must be kept confidential to avoid privacy leaks.

X.509 Certificate

Public key certificate format used across TLS and code signing; relevant for RPC gateways, API auth, and hybrid Web3 systems that integrate with Web PKI.

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