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A put option contract offers an owner the opportunity, but not the compulsion, to buy an underlying security at a certain price within a given time frame.
A pyramid scheme is a scam with a hierarchical top-down structure.
A machine-readable label that shows information encoded into a graphical black-and-white pattern.
A computer that harnesses phenomena from quantum mechanics in order to perform much more efficient computations than older, classical computer technologies are capable of.
A quorum is the minimum number of members of an assembly or group that must be present at any of its meetings to make the proceedings of that meeting valid.
Radio Frequency Identification (RFID) is a type of technology that uses radio waves to passively identify a tagged item or individual.
An off-chain scaling solution aiming to enable near-instant, low-fee and scalable payments on the Ethereum blockchain, similar to Bitcoin's proposed Lightning Network.
The relative position of a cryptocurrency by market capitalization.
Ransomware is a type of malware used by hackers to steal or encrypt their victims’ files to extort them for a ransom in exchange for file decryption or restoration.
Rebalancing is the process of realigning the weightage of a portfolio of assets, that involves buying or selling assets periodically to maintain a targeted level of asset allocation and risk.
A recovery seed is a cryptographically derived security code composed of a list of random words, typically ranging between 12 and 14.
A local currency is one that is spent in a certain geographical location. A regional currency refers to a local currency utilized in a larger area, and a community currency is often used within a specific community as a means of exchange.
Regulation is when something is controlled by a specific set of rules.
Regulatory compliance is a set of mandates that every company or industry is required to follow to track accountability at work.
Rehypothecation is the practice where banks, and even the brokers themselves, use assets that have been posted as collateral by their clients for their own purposes.
Rehypothecation is a process where brokers use the assets collateralized by clients for their own benefit.
A shorthand slang for “wrecked,” describing a bad loss in a trade.
A form of technical analysis that serves as a momentum oscillator, measuring the speed and change of price movements.
The Relay Chain is the central chain that is used by the Polkadot network.
Relay nodes help block-producing nodes communicate by guaranteeing that the authenticity of the core nodes and the blockchain is preserved, even if one or more relays are hacked.
Repair miners are a proposed type of mining node within the Filecoin network.
Replay attacks are network security attacks where the comms between a sender and receiver is intercepted.
A copy of a distributed ledger in a network that is distributed to all participants in a cryptocurrency network.
The highest price level of an asset during a specific period.
A retargeting algorithm, also referred to as a difficulty adjustment algorithm, is used on proof-of-work blockchains, such as Bitcoin. 
Revenue participation tokens are a two token system that uses one participation token and one payout token.
A person whom you may use as an indicator of how not to place buy or sell orders because they are always wrong at predicting price movements of cryptocurrencies.
RingCT is how transaction amounts are hidden in Monero.
A cryptographic digital signature that obfuscates the identities of two parties within a transaction.