├── README.md
└── bihu-airdrop-tool.py


/README.md:
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 1 | # bihu-tools
 2 | 
 3 | ## bihu-airdrop-tool.py
 4 | 
 5 | 1. 币乎官方会给每个合格的参与者, 分配一个奖券号，从1开始的整数。
 6 | 2. 币乎官方会在空投活动开始前，公布比特币未来的某个区块号，比如1000。 
 7 |    - 并使用这个区块的hash，计算一个luck number
 8 |    - luck_num = hash1(hash2(...hash(n)(block.hash)))
 9 | 3. 对每一个奖券号，计算得分score.
10 |    - score ＝ hash( luck_num + 奖券号) ％ base
11 | 4. 依据得分排序，最高的一等奖，以此等等。
12 | 
13 | Demo:
14 | https://repl.it/@clar1/bihu-airdrop-reward
15 | 


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/bihu-airdrop-tool.py:
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 1 | #!/usr/bin/python
 2 | 
 3 | import hashlib
 4 | from collections import OrderedDict
 5 | 
 6 | airdrop_prefix = 'AA'
 7 | # block hash
 8 | block_hash = bytes.fromhex('0000000000000000003729bfa376e4148ee0643ce834053d885af5699440d6d3')
 9 | # total lottery num
10 | total_lottery = 1000
11 | 
12 | 
13 | 
14 | def lucky_num_from_block_hash(h):
15 |     hash_names = ['md5', 'md4', 'whirlpool', 'RIPEMD160', 'sha1', 'sha224', 'sha256', 'sha384', 'sha512']
16 |     print(str(len(hash_names)) + ": " + str(hash_names))
17 | 
18 |     repeat = 10000 * 400 * 20
19 |     r = h
20 |     for i in range(repeat):
21 |         if i % 100000 == 0:
22 |             print(str(i) + ":...")
23 |         for n in hash_names:
24 |             h = hashlib.new(n)
25 |             h.update(r)
26 |             r = h.digest()
27 | 
28 |     return r
29 | 
30 | 
31 | def score_for_each_lottery(lucky_num, lottery_id):
32 |     # print(result_hash.hex())
33 |     h = hashlib.sha256()
34 |     h.update(lucky_num)
35 |     h.update(bytes(lottery_id))
36 | 
37 |     base = 10**11
38 |     score = int(h.hexdigest(), 16) % base
39 |     return score
40 | 
41 | 
42 | def compute_airdrop_reward():
43 |     r = {}
44 |     lucky_num = lucky_num_from_block_hash(block_hash)
45 | 
46 |     for lottery_id in range(1, total_lottery + 1):
47 |         s = score_for_each_lottery(lucky_num, lottery_id)
48 |         r[lottery_id] = s
49 |     return r
50 | 
51 | 
52 | def lottery_format(n):
53 |     return airdrop_prefix + '-' + str(n).zfill(7)
54 | 
55 | 
56 | def dump_rewards_to_file(rewards):
57 |     c = 1
58 |     f = open('rewards.txt', 'w')
59 |     for r in rewards:
60 |         f.write(str(c) + ',' + lottery_format(r) + ',' + str(rewards[r]) + '\n')
61 |         c += 1
62 | 
63 |     f.close()
64 | 
65 | reward_map = compute_airdrop_reward()
66 | reward_sorted = OrderedDict(sorted(reward_map.items(), key=lambda t: t[1], reverse = True))
67 | print("=======================Rewards================================")
68 | 
69 | dump_rewards_to_file(reward_sorted)
70 | 


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