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  2. Service of process - Wikipedia

    en.wikipedia.org/wiki/Service_of_process

    Once service of process has been effected, the responsible officer or process server must typically file a return of service or proof of service or affidavit of service with the court (or convey one to the plaintiff to file with the court). The return of service indicates the time and place at which service was effected, the person served, and ...

  3. Proof of service - Wikipedia

    en.wikipedia.org/?title=Proof_of_service&redirect=no

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  4. Proof of work - Wikipedia

    en.wikipedia.org/wiki/Proof_of_work

    Proof of work (PoW) is a form of cryptographic proof in which one party (the prover) proves to others (the verifiers) that a certain amount of a specific computational effort has been expended. [1] Verifiers can subsequently confirm this expenditure with minimal effort on their part.

  5. Hague Service Convention - Wikipedia

    en.wikipedia.org/wiki/Hague_Service_Convention

    Although the service is free, it may take 4 to 12 months for the central authority to process. The central authority decides which method is to be used. In many cases, a bailiff will be assigned by a local court to serve the documents and mail back the proof of service, but service by mail is also possible. [1]

  6. Hashcash - Wikipedia

    en.wikipedia.org/wiki/Hashcash

    Hashcash is a proof-of-work system used to limit email spam and denial-of-service attacks. Hashcash was proposed in 1997 by Adam Back [1] and described more formally in Back's 2002 paper "Hashcash – A Denial of Service Counter-Measure". [2] In Hashcash the client has to concatenate a random number with a string several times and hash this new ...

  7. Registered mail - Wikipedia

    en.wikipedia.org/wiki/Registered_mail

    Registered mail is a postal service in many countries which allows the sender proof of mailing via a receipt and, upon request, electronic verification that an article was delivered or that a delivery attempt was made. Depending on the country, additional services may also be available, such as:

  8. Proof of concept - Wikipedia

    en.wikipedia.org/wiki/Proof_of_concept

    Proof of concept testing of oil cleanup equipment. Proof of concept (POC or PoC), also known as proof of principle, is a realization of a certain idea, method or principle in order to demonstrate its feasibility, [1] or viability, [2] or a demonstration in principle with the aim of verifying that some concept or theory has practical potential.

  9. Proof-of-payment - Wikipedia

    en.wikipedia.org/wiki/Proof-of-payment

    POP payment center in New York City, used for Select Bus Service lines. Ticket hall with open barrier line in Niittykumpu metro station, Espoo, Finland. Proof-of-payment (POP) or proof-of-fare (POF) is an honor-based fare collection system used on many public transportation systems.