HMAC
HMAC (Hash-Based Message Authentication Code) is a cryptographic method that combines a secret key with a hash function to prove that a…
Glossary terms starting with H
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HMAC Signature
An HMAC signature is a shared-secret authentication tag calculated over defined message bytes using HMAC and an agreed cryptographic hash function. An…
Hold Invoice
A hold invoice is an invoice temporarily prevented from normal payment, delivery, posting, collection, or completion while a review or dependency remains…
Holiday Payment
A holiday payment is a payment initiated, scheduled, processed, or due on a day when one or more relevant financial institutions or…
Holographic Consensus
Holographic consensus is a scalable decentralized-governance mechanism that uses prediction staking to elevate proposals likely to receive broad collective approval. The mechanism…
Homomorphic Encryption
Homomorphic encryption is a cryptographic technique that allows selected computations to be performed on encrypted data without first exposing the underlying plaintext…
Hospitality Crypto Payment
Hospitality Crypto Payment is a cryptocurrency payment for accommodation, food service, travel-related hospitality, deposits, or incidental charges. Reservation timing, deposits, cancellations, and…
Hosted Checkout
Hosted Checkout is a checkout page that is rendered and operated on infrastructure controlled by a payment or commerce provider. In merchant…
Hosted Crypto Invoice
A Hosted Crypto Invoice is an invoice displayed and managed on a provider-operated web page rather than rendered entirely by the merchant.…
Hosted Payment URL
A hosted payment URL is a link to a payment page operated by a payment provider or platform. It carries or resolves…
Hosted Wallet
A hosted wallet is a wallet service operated on provider-controlled infrastructure, commonly giving users account access instead of direct possession of signing…
Hosting Crypto Payment
Hosting Crypto Payment is a cryptocurrency payment for web hosting, servers, domains, cloud resources, or related infrastructure services. Automated provisioning and recurring…
Hot Custody
Hot custody is a custody model in which some signing authority remains connected or readily accessible for fast, automated asset movement. A…
Hot Vault
Hot Vault is a vault connected to online systems or capable of near-real-time signing for routine withdrawals, payments, or treasury operations. It…
Hot Wallet
A hot wallet is a wallet whose signing capability is connected to online systems or otherwise available for frequent, rapid transactions. Interface…
Hot Wallet Compromise
A hot wallet compromise occurs when an attacker gains unauthorized control over an internet-connected wallet, its signing keys, approval workflow, or supporting…
Hot Wallet Risk
Hot wallet risk is the potential for loss, disruption, or unauthorized movement created by keeping wallet authorization accessible to online operations. Reliable…
Hot Wallet Sweep
A hot wallet sweep is an automated or approved transfer that moves excess assets from an exposed operational wallet to a safer…
HotStuff Consensus
HotStuff is a leader-based Byzantine fault tolerant consensus family that uses quorum certificates and chained voting to achieve safe replicated-state agreement. In…
HTTP
HTTP is an application-layer, request-response protocol used by clients, servers, and intermediaries to exchange representations and control information on the web. Developers…
HTTP Request Smuggling
HTTP request smuggling is an attack that exploits inconsistent parsing of HTTP message boundaries between front-end and back-end systems so hidden or…
HTTP Strict Transport Security (HSTS)
HSTS is a browser-enforced web security policy that requires future connections to a declared host to use HTTPS instead of insecure HTTP.…
Hybrid Consensus
Hybrid consensus combines two or more agreement mechanisms, resources, or finality layers to balance security, performance, participation, and recovery properties. The components…
Hybrid Custody
Hybrid custody combines different custody models or control layers to balance asset security, operational speed, resilience, and organizational responsibility. A production model…