Oracles: key words

A service that brings information from outside a blockchain, such as a price, to smart contracts. Source

The difficulty of making sure outside data is correct, available and honest, when a contract has to trust whoever supplies it. Source

An oracle that keeps a current price on-chain for contracts to read, such as ETH in US dollars. Source

Combining many reports into one value, often by taking the median. Source

How far, in percent, the outside price must move from the on-chain price before a feed updates. Source

The set time after which a feed starts an update even if the price has not moved. Source

An oracle whose operator keeps sending price updates to the chain, at set times or after big moves. Source

An oracle whose signed prices wait off-chain until a user brings one on-chain in their own transaction. Source

A group of independent oracle nodes that agree on a value before it goes on-chain. Source

Time-weighted average price: an average of a price over a period, so a short spike counts for little. Source

Pushing around the price an oracle reads, so a contract acts on a false value. Source

A loan taken out and paid back within the same transaction. Source