Data contains information on other data, such as details about a particular transaction's properties.
Off-Chain
All network users can see on-chain transactions because they are recorded on the distributed ledger. Off-chain transactions, however, take place away from the blockchain network
Falling Knife
The term falling knife (also known as "Catching a Falling Knife" or "Catching the Bottoms") refers to the action of buying an asset which is rapidly declining in price.
Testnet
An alternative blockchain used by developers for testing.