XMR (Monero)

Privacy-focused cryptocurrency using ring signatures, stealth addresses, and confidential transactions; ticker XMR is commonly used on exchanges and charts.

XZ Backdoor (2024)

Supply chain compromise of the xz compression utilities that underscores risks in open source dependencies and the need for provenance, SLSA, and reproducible builds.

Xen Hypervisor

Type-1 hypervisor used in cloud platforms; relevant for running validator nodes and indexers with strong isolation and live migration capabilities.

XTS-AES

Block cipher mode for disk encryption that provides tweakable confidentiality across sectors; relevant for protecting validator keys at rest on servers and laptops.

XML-RPC (Legacy API)

Remote procedure call protocol using XML over HTTP; largely replaced by JSON-RPC in blockchain stacks but still found in older CMS and integrations.

X-Frame-Options

HTTP header that controls whether a page can be framed, mitigating clickjacking on wallet popups and admin dashboards; modern CSP frame-ancestors is preferred.

X-Content-Type-Options

HTTP response header, typically set to nosniff, that prevents MIME type sniffing and reduces the risk of drive by downloads or script confusion attacks in dapps.

XSS, Cross-Site Scripting

Injection attack that executes untrusted scripts in a user’s browser, a key risk for dapps that render user provided NFT metadata or markdown without sanitization.

Xavier Initialization (Glorot)

Parameter initialization scheme that keeps variance constant across layers to stabilize training of deep networks, also called Glorot initialization.

XLA, Accelerated Linear Algebra

Compiler that fuses and lowers ML operations to optimized kernels across CPU, GPU, and TPU backends, speeding model training and inference pipelines.

NACKL News