An orphan block is a block that has been resolved on the blockchain network but not accepted by the network.
There can be two miners solving valid blocks at the same time. The network uses both blocks until one chain has more verified blocks than the other. Blocks in the shorter chain are then orphaned.
Orphans are a common occurrence in distributed blockchains such as Bitcoin and Ethereum.
An application-specific integrated circuit (ASIC) miner is a computerized device or hardware that uses an ASIC solely to mine bitcoin or another cryptocurrency.
Decentralized applications, also known as “dApps” or “dapps”, are digital applications that run on a network of blockchain computers instead of relying on a single computer.
Hashed Time Lock Contract (HTLC) reduces counterparty risk in decentralized smart contracts by effectively creating a time-based escrow that uses a cryptographic passphrase.
A horizontal spread is a simultaneous long and short position in derivatives for the same underlying asset and strike price, but with different expiration dates.
IOTA is a distributed ledger designed to process transactions between connected devices in the IoT ecosystem, and its cryptocurrency is known as MIOTA.
A Simple Agreement for Future Tokens (SAFT) is a security issued for the eventual transfer of digital tokens from cryptocurrency developers to investors.
Tick size - the minimum change in the price increment of a trading instrument.
– Tick sizes used to be in fractions (e.g. 1/16th of $1), but today they are mostly decimal based and expressed in cents.
Ommer blocks are created on the Ethereum blockchain when two blocks are created and sent to the ledger at roughly the same time. Only one can enter the register.