Topic: Coinroll.it - Dice rolling game | Instant bets | Off-the-chain | 1% House edge - page 41. (Read 81559 times)

$ ./coinroll.py
missing secret for 05-20-2013
662354 right and 0 wrong
$

#!/usr/bin/env python

# verify all coinroll.it bets from their db dump
#
# 1. download secrets and bets from https://coinroll.it/verification
# 2. bunzip2 bets.csv.bz2
# 3. run this script in the same folder

import hashlib, hmac, string, time

def hash(txid, nonce, secret):
    return int(hmac.new(secret, "%s:%s" % (txid, nonce), hashlib.sha512).hexdigest()[:4],16)

secrets = {}

for line in open('secrets.txt').readlines():
    (date, secret) = string.split(line[:-1])
    secrets[date] = secret

fp = open("bets.csv")
fp.readline() # throw away first line - it's the field names

missing = {} # note which dates we don't know the secrets for
wrong = 0 # count errors
right = 0 # count successes

while True:
    line = fp.readline()
    if (not line): break
    (betid, user, stamp, nonce, lucky, target, win, diff, txid) = string.split(line[:-1], ',')

    nonce = string.atoi(nonce)
    lucky = string.atoi(lucky)
    txid = string.split(txid, '"')[1]
    stamp = string.atof(stamp)/1000
    date = time.strftime('%m-%d-%Y', time.gmtime(stamp))

    if not secrets.has_key(date):
        missing[date] = 1
        continue
            
    secret = secrets[date]
    calc = hash(txid, nonce, secret)

    if calc != lucky:
        wrong += 1
        found = False
        for off in range(1,5):
            if lucky == hash(txid, nonce - off, secret):
                target = string.atoi(target)
                print "bet %s txid %s:%-5d should be %-5d (off by %d)" % (betid, txid, nonce, nonce - off, off)
                found = True
                break
        if (not found):
            print "%s lucky number is wrong (%5d != %5d): %s" % (betid, lucky, calc, time.ctime(stamp))
    else:
        right += 1

for i in missing.keys():
    print "missing secret for", i

print "%d right and %d wrong" % (right, wrong)

old: "0022382334fe","cb4a-d75e-142d",1368486703517.0,41881,5890,49189,true,319,"090de7a9a363bc41c992ec000f77ffe6692155308ae5020a4e1e58c4222a1b65"
new: "0022382334fe","cb4a-d75e-142d",1368486703517.0,41880.0,5890,49189,true,319,"090de7a9a363bc41c992ec000f77ffe6692155308ae5020a4e1e58c4222a1b65"

>>> (0.75**15) * 100
1.3363461010158062

$ echo -n '090de7a9a363bc41c992ec000f77ffe6692155308ae5020a4e1e58c4222a1b65:41988' | openssl dgst -sha512 -hmac 'mEL0R7en4QQZtJpHkath9YtvEed2YbzrOAQrIkTkd1ZmX5YNoPprlWf6XeTFoQZD' | sed 's/^.* //' | cut -c1-4 | xargs -I{} printf "%d\n" 0x{}
56785

$ echo -n '090de7a9a363bc41c992ec000f77ffe6692155308ae5020a4e1e58c4222a1b65:41987' | openssl dgst -sha512 -hmac 'mEL0R7en4QQZtJpHkath9YtvEed2YbzrOAQrIkTkd1ZmX5YNoPprlWf6XeTFoQZD' | sed 's/^.* //' | cut -c1-4 | xargs -I{} printf "%d\n" 0x{}
41982

bet "04ea204f8cb5" nonce 42290 should be 42286 (off by 4)
bet "c56d77775b9e" nonce 42290 should be 42287 (off by 3)
bet "9e2e44e570c0" nonce 42290 should be 42288 (off by 2)
bet "2ec74cf218a1" nonce 42290 should be 42289 (off by 1)

bet "70cb835c740f" nonce 42299 should be 42296 (off by 3)
bet "de7c0b0ceb1d" nonce 42299 should be 42297 (off by 2)
bet "715dd2d635ee" nonce 42299 should be 42298 (off by 1)