A rule change that can make blocks valid under the new rules but invalid under the old ones.
Node operators install an announced upgrade before activation so their software accepts blocks produced under the new rules.
A dedicated device designed to generate, protect and use signing keys without exposing them to a general-purpose computer.
"The app shows one destination, so I check that the hardware wallet displays the same address before signing."
The number of hash calculations performed per second by mining equipment or a mining network.
Two miners compare hardware in terahashes per second. A network dashboard estimates the combined hashrate rather than reading every device directly.
A hierarchical deterministic wallet that derives a tree of keys from shared seed material.
"New receiving address again? Yes. My HD wallet derives it from the same backed-up seed material."
A collateralized position’s safety metric; in Aave, liquidation-adjusted collateral value divided by debt value.
Your Aave health factor falls as collateral prices drop, so you review the debt and collateral before it crosses the liquidation boundary.
A wallet whose signing capability is available on an internet-connected system.
Your connected phone can sign the payment right now, which is convenient and also puts the signer in an online environment.
A hashed time-locked contract: a conditional payment combining a secret-hash requirement with a timeout.
The Lightning recipient reveals the required preimage, allowing the hash-conditioned routed payment to complete before its timeout.
InterPlanetary File System: a protocol suite for addressing and sharing content through content-derived identifiers.
Your NFT viewer asks peers for the content identified by its IPFS reference; a peer retaining that content serves it.
A JSON-based request and response format commonly used by applications to communicate with blockchain nodes.
Your wallet asks an Ethereum RPC endpoint for your account balance, then sends a signed transaction through it when you approve a transfer.
A Keccak hash function with a 256-bit output, used extensively in Ethereum.
"My function selector doesn't match." The tool used SHA3-256, while the Ethereum contract expects its Keccak-256 variant.