{"id":34823,"date":"2019-10-31T22:00:35","date_gmt":"2019-10-31T19:00:35","guid":{"rendered":"https:\/\/prohoster.info\/blog\/ispolzovanie-sluchajnogo-orakula-na-primere-loterei\/"},"modified":"2019-10-31T22:00:35","modified_gmt":"2019-10-31T19:00:35","slug":"ispolzovanie-sluchajnogo-orakula-na-primere-loterei","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/administrirovanie\/ispolzovanie-sluchajnogo-orakula-na-primere-loterei","title":{"rendered":"Brug af en tilf\u00e6ldig orakel med eksemplet fra lotteriet","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

En morgen st\u00f8dte jeg p\u00e5 en artikel om en verificeret tilf\u00e6ldig talgenerator<\/a><\/noindex> p\u00e5 blockchainen Waves platform. <\/p>\n

Det overordnede billede var klart, men metoden til den specifikke implementering - det var uklart. Hvad med koderne, underskrifterne, hvad, hvor, hvorfor?<\/p>\n

Efter nogle konsultationer med forfatteren af oraklet lykkedes det mig at kombinere logikken for lodtr\u00e6kningen (implementeret i PHP) med algoritmen for at generere et tilf\u00e6ldigt tal.
\n<\/a><\/noindex><\/p>\n

    \n
  1. Ved starten af turneringen\/runden anmoder vi oraklet om den f\u00f8rste del af koden (R-code).\n

    P\u00e5 det tidspunkt er der ingen information om antallet af spillere, antallet af pr\u00e6miepladser, st\u00f8rrelsen af pr\u00e6mieudbetalingerne og overhovedet eksistensen af lotteriet. Oraklet giver gennem en transaktion en personlig tilf\u00e6ldig kode, der kun kan bruges \u00e9n gang af den, der har anmodet om den. For resten kan R-code \"k\u00f8bes\" (dette refererer til omkostningen ved transaktionsanmodningen + kompensation til oraklet for den svarende transaktion, hvilket ansl\u00e5s at koste omkring $0.015 efter den nuv\u00e6rende kurs, selve koden gives gratis) p\u00e5 forh\u00e5nd, s\u00e5 man ikke skal vente p\u00e5 at modtage den svarende transaktion. Jeg lavede en lille regelm\u00e6ssigt opdateret buffer i databasen.<\/li>\n

  2. Turneringen varer standard 60 blokke p\u00e5 Waves blockchain, hvilket svarer til cirka 1 time. Turneringen betragtes som valid og afsluttet, hvis der efter 60 blokke er mindst to billetter; ellers forl\u00e6nges turneringens aktive periode med de n\u00e6ste 60 blokke.<\/li>\n
  3. Umiddelbart efter turneringsafslutningen danner og sender vi data-transaktionen (vi betaler ogs\u00e5 et gebyr p\u00e5 cirka $0.005 for den), om n\u00f8dvendigt flere, hvori alle betingelser for lodtr\u00e6kningen og den ordnede liste over spillere (billetter), hvorfra vi skal v\u00e6lge vindere, er fastlagt.<\/li>\n
  4. P\u00e5 dette stadium har vi allerede den f\u00f8rste del af koden (R-code) plus ID for data-transaktionen (TXID). Vi sender dem til oraklet for underskrivelse i form af en konkatenering (R-code + TXID), igen betaler vi gebyr+kompensation. Oraklet kontrollerer de modtagne data for unikhed og ejerskab og sender os til svar den anden del af koden (S-code) i sha256-format, som er udgangspunktet for den tilf\u00e6ldige talgenerator.<\/li>\n
  5. For at f\u00e5 et tilf\u00e6ldigt nummer, der angiver r\u00e6kkenummeret for den vindende billet, konverterer vi S-koden fra bin\u00e6re data i sha256 til en hexadecimalt (HEX) format. Derefter f\u00e5r vi et tal fra den resulterende HEX-streng. Vi tager resten af divisionen af det opn\u00e5ede tal med antallet af billetter (all_tickets) og l\u00e6gger 1 til resultatet (for at f\u00e5 et tal fra 1 til all_tickets). I sidste ende f\u00e5r vi vindernes r\u00e6kkenummer.<\/li>\n
  6. Hvis der if\u00f8lge lodtr\u00e6kningsbetingelserne er flere vindere, gentager vi de tidligere operationer et antal gange svarende til antallet af pr\u00e6miepladser. Hver gang fjerner vi billetten, der allerede har vundet, fra listen og reducerer all_tickets med 1, mens vi i stedet angiver den tidligere opn\u00e5ede v\u00e6rdi som S-kode.<\/li>\n<\/ol>\n

    \nLad os se p\u00e5 et konkret eksempel, turnering nr. 119:<\/p>\n

    I alt 7 billetter (all_tickets)
    \nBilletpris 50 m\u00f8nter (Bet)
    \nSpilafgift 10% (Fee)<\/p>\n

    I henhold til lotteribetingelserne g\u00e5r 30% til pr\u00e6mier, dvs. i dette tilf\u00e6lde skal 2 billetter modtage pr\u00e6mien, hvis st\u00f8rrelse beregnes efter formlen (Bet * all_tickets - Fee) \/ 2.<\/p>\n

    1. Vi fik R-koden: RdbAiAhKhveAtR4eyTKq75noMxdcEoxbE6BvojJjM13VE<\/a><\/noindex><\/p>\n

    2. Efter turneringens afslutning har vi en liste over billetter i form af par: nummer + adresse (adressen p\u00e5 wallet, hvorfra deltagergebyret blev betalt). Bem\u00e6rk, at adresserne kan gentages, hvilket betyder, at \u00e9n deltager har k\u00f8bt flere billetter til \u00e9n turnering, hvilket ikke er forbudt af reglerne.<\/p>\n

    Sendt transaktionsdato: 82JTMzhHM5xEA2fQ9Qscd5QAJU3DAd8nShLjdVHTer5S<\/a><\/noindex><\/p>\n

    3. Anmodede om S-kode: FTF3uRyaa4F2uAyD6z5a3CNbTXbQLc7fSR6CFNVjgZYV<\/a><\/noindex> med kommentar (R-kode + TXID):
    \nRdbAiAhKhveAtR4eyTKq75noMxdcEoxbE6BvojJjM13VE 82JTMzhHM5xEA2fQ9Qscd5QAJU3DAd8nShLjdVHTer5S<\/p>\n

    4. Vi fik S-koden: Ri89jHB4UXZDXY6gT1m4LBDXGMTaYzHozMk4nxiuqVXdC<\/a><\/noindex><\/p>\n

    5. Vindere blev bestemt.<\/p>\n

    6. Udbetalinger sendt<\/a><\/noindex><\/p>\n

    Som resultat har vi en trinvis registrering af lodtr\u00e6kningsproceduren i blockchainen med mulighed for at kontrollere den n\u00e5r som helst. At manipulere med resultaterne fra arrang\u00f8ren er praktisk talt umuligt, i det mindste er det ikke l\u00e6ngere muligt at g\u00f8re det uset.<\/p>\n

    bestem vinderen nr. 1\n\nAlle_billetter:\nIndex: 1 Billet:139\nIndex: 2 Billet:141\nIndex: 3 Billet:143\nIndex: 4 Billet:145\nIndex: 5 Billet:147\nIndex: 6 Billet:149\nIndex: 7 Billet:151\n\n1. bin -> hex ( bin2hex(sha256(S-kode)) ): Ri89jHB4UXZDXY6gT1m4LBDXGMTaYzHozMk4nxiuqVXdC -> 0xdaf5802953dcb27f89972e38e8900b898733f6a613e6e1c6c5491362c1832596\n\n2. hex -> gmp nummer: 0xdaf5802953dcb27f89972e38e8900b898733f6a613e6e1c6c5491362c1832596 -> 99037963059744689166154019807924045947962565922868104113173478160267437352342\n\n3. gmp -> modulo (mod=7): 99037963059744689166154019807924045947962565922868104113173478160267437352342 -> 4\n\n4. modulo -> billet: 4 -> 145\n\nbestem vinderen nr. 2\n\nAlle_billetter:\n\nIndex: 1 Billet:139\nIndex: 2 Billet:141\nIndex: 3 Billet:143\nIndex: 4 Billet:147\nIndex: 5 Billet:149\nIndex: 6 Billet:151\n\n1. bin -> hex ( bin2hex(sha256(tidligere hex)) ): daf5802953dcb27f89972e38e8900b898733f6a613e6e1c6c5491362c1832596 -> 0x9560e77525e9ea2db92cdb8484dc52046ccafac7c719b8859ff55f0eb92834a0\n2. hex -> gmp nummer: 0x9560e77525e9ea2db92cdb8484dc52046ccafac7c719b8859ff55f0eb92834a0 -> 67565829218838067182838043983962684143266386786567427968312120473742580659360\n3. gmp -> modulo (mod=6): 67565829218838067182838043983962684143266386786567427968312120473742580659360 -> 1\n4. modulo -> billet: 1 -> 139\n\nSlut.<\/code><\/pre>\n
    Kilde: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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\u043a\u0443\u0434\u0430, \u0437\u0430\u0447\u0435\u043c? \u041d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043a\u043e\u043d\u0441\u0443\u043b\u044c\u0442\u0430\u0446\u0438\u0439 \u0443 \u0430\u0432\u0442\u043e\u0440\u0430 \u043e\u0440\u0430\u043a\u0443\u043b\u0430, \u0432 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0435 \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u043e\u0441\u044c \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0438\u0442\u044c \u043b\u043e\u0433\u0438\u043a\u0443 \u0440\u043e\u0437\u044b\u0433\u0440\u044b\u0448\u0430 (\u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u0430 \u043d\u0430 PHP) \u0441 \u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c\u043e\u043c \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u0438\u044f \u0441\u043b\u0443\u0447\u0430\u0439\u043d\u043e\u0433\u043e \u0447\u0438\u0441\u043b\u0430. \u0412 \u043c\u043e\u043c\u0435\u043d\u0442 \u0441\u0442\u0430\u0440\u0442\u0430 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