Simulation script for ice age block times
| # Date, blocknum, difficulty as of 2019-01-18 | |
| # Script by vbuterin, slightly modified by lrettig | |
| import random | |
| import datetime | |
| import sys | |
| def calc_bomb(i): | |
| period = i // 100000 | |
| if (period > 0): | |
| # Subtract 2, this is the original formula | |
| # Subtract another 30, this is the Byzantium delay | |
| return 2**(period - 32) | |
| return 0 | |
| def calc_difficulty_byzantium(i, cur_time, prev_diff, prev_time): | |
| new_diff = prev_diff + prev_diff // 2048 * max(1 - (cur_time - prev_time) // 9, -99) | |
| new_diff += calc_bomb(i) | |
| return new_diff | |
| first_block = 7_087_671 | |
| times = [1547823394] | |
| #diffs = [3_033_556_249_786_083] | |
| diffs = [2_580_831_000_000_000] | |
| hashpower = diffs[0] / 14 | |
| for i in range(first_block, 10_000_000): | |
| blocktime = random.expovariate(hashpower / diffs[-1]) | |
| new_time = times[-1] + blocktime | |
| new_diff = calc_difficulty_byzantium(i, new_time, diffs[-1], times[-1]) | |
| times.append(new_time) | |
| diffs.append(new_diff) | |
| predicted_avg_blocktime = diffs[-1] / hashpower | |
| if i % 10000 == 0: | |
| print('Block %d, time %r blocktime %.2f diffratio %.4f' % ( | |
| i, | |
| datetime.datetime.utcfromtimestamp(times[-1]).isoformat().replace('T',' '), | |
| predicted_avg_blocktime, | |
| calc_bomb(i) / diffs[-1], | |
| )) | |
| if predicted_avg_blocktime > 60: | |
| sys.exit('Predicted block time exceeded 60s') |
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