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  2. Proof of work - Wikipedia

    en.wikipedia.org/wiki/Proof_of_work

    The purpose of proof-of-work algorithms is not proving that certain work was carried out or that a computational puzzle was "solved", but deterring manipulation of data by establishing large energy and hardware-control requirements to be able to do so. [6] Proof-of-work systems have been criticized by environmentalists for their energy ...

  3. Proof of space - Wikipedia

    en.wikipedia.org/wiki/Proof_of_space

    The Proof of Capacity (PoC) consensus algorithm is used in some cryptocurrencies. Conditional Proof of Capacity (CPOC) [10] is an improved version of PoC. It has a work, stake, and capacity system that works like the PoW, PoS, and PoC algorithms. By pledging their digital assets, users receive a higher income as a reward.

  4. Proof of stake - Wikipedia

    en.wikipedia.org/wiki/Proof_of_stake

    Proof-of-stake (PoS) protocols are a class of consensus mechanisms for blockchains that work by selecting validators in proportion to their quantity of holdings in the associated cryptocurrency. This is done to avoid the computational cost of proof-of-work (POW) schemes.

  5. XRP Ledger - Wikipedia

    en.wikipedia.org/wiki/XRP_Ledger

    The XRP Ledger operates on a consensus protocol that differs from traditional proof-of-work (PoW) and proof-of-stake (PoS) mechanisms. [8] [3] Transactions are validated by a network of independent validators who reach consensus every 3 to 5 seconds, enabling rapid transaction settlement. [8]

  6. Point of sale - Wikipedia

    en.wikipedia.org/wiki/Point_of_sale

    The point of sale (POS) or point of purchase (POP) is the time and place at which a retail transaction is completed.At the point of sale, the merchant calculates the amount owed by the customer, indicates that amount, may prepare an invoice for the customer (which may be a cash register printout), and indicates the options for the customer to make payment.

  7. Micros Systems - Wikipedia

    en.wikipedia.org/wiki/MICROS_Systems

    Micros Systems, Inc. was an American computer company who manufactured hardware and developed software and services for the restaurant point of sale, hotel, hospitality, sports and entertainment venues, casinos, cruise lines, specialty retail markets and other similar markets. [3]

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