p2pool/data.py

   1 from __future__ import division
   2
   3 import itertools
   4 import random
   5 import time
   6 import os
   7
   8 from twisted.python import log
   9
  10 import p2pool
  11 from p2pool import skiplists
  12 from p2pool.bitcoin import data as bitcoin_data, script, networks
  13 from p2pool.util import memoize, expiring_dict, math
  14
  15
  16 merkle_branch_type = bitcoin_data.ListType(bitcoin_data.ComposedType([
  17     ('side', bitcoin_data.StructType('<B')), # enum?
  18     ('hash', bitcoin_data.HashType()),
  19 ]))
  20
  21
  22 share_data_type = bitcoin_data.ComposedType([
  23     ('previous_share_hash', bitcoin_data.PossiblyNoneType(0, bitcoin_data.HashType())),
  24     ('target', bitcoin_data.FloatingIntegerType()),
  25     ('nonce', bitcoin_data.VarStrType()),
  26 ])
  27
  28
  29 coinbase_type = bitcoin_data.ComposedType([
  30     ('identifier', bitcoin_data.FixedStrType(8)),
  31     ('share_data', share_data_type),
  32 ])
  33
  34 share_info_type = bitcoin_data.ComposedType([
  35     ('share_data', share_data_type),
  36     ('new_script', bitcoin_data.VarStrType()),
  37     ('subsidy', bitcoin_data.StructType('<Q')),
  38 ])
  39
  40
  41 share1a_type = bitcoin_data.ComposedType([
  42     ('header', bitcoin_data.block_header_type),
  43     ('share_info', share_info_type),
  44     ('merkle_branch', merkle_branch_type),
  45 ])
  46
  47 share1b_type = bitcoin_data.ComposedType([
  48     ('header', bitcoin_data.block_header_type),
  49     ('share_info', share_info_type),
  50     ('other_txs', bitcoin_data.ListType(bitcoin_data.tx_type)),
  51 ])
  52
  53 def calculate_merkle_branch(txs, index):
  54     hash_list = [(bitcoin_data.tx_type.hash256(tx), i == index, []) for i, tx in enumerate(txs)]
  55
  56     while len(hash_list) > 1:
  57         hash_list = [
  58             (
  59                 bitcoin_data.merkle_record_type.hash256(dict(left=left, right=right)),
  60                 left_f or right_f,
  61                 (left_l if left_f else right_l) + [dict(side=1, hash=right) if left_f else dict(side=0, hash=left)],
  62             )
  63             for (left, left_f, left_l), (right, right_f, right_l) in
  64                 zip(hash_list[::2], hash_list[1::2] + [hash_list[::2][-1]])
  65         ]
  66
  67     assert hash_list[0][1]
  68     assert check_merkle_branch(txs[index], hash_list[0][2]) == hash_list[0][0]
  69
  70     return hash_list[0][2]
  71
  72 def check_merkle_branch(tx, branch):
  73     hash_ = bitcoin_data.tx_type.hash256(tx)
  74     for step in branch:
  75         if not step['side']:
  76             hash_ = bitcoin_data.merkle_record_type.hash256(dict(left=step['hash'], right=hash_))
  77         else:
  78             hash_ = bitcoin_data.merkle_record_type.hash256(dict(left=hash_, right=step['hash']))
  79     return hash_
  80
  81 def gentx_to_share_info(gentx):
  82     return dict(
  83         share_data=coinbase_type.unpack(gentx['tx_ins'][0]['script'])['share_data'],
  84         subsidy=sum(tx_out['value'] for tx_out in gentx['tx_outs']),
  85         new_script=gentx['tx_outs'][-1]['script'],
  86     )
  87
  88 def share_info_to_gentx(share_info, block_target, tracker, net):
  89     return generate_transaction(
  90         tracker=tracker,
  91         previous_share_hash=share_info['share_data']['previous_share_hash'],
  92         new_script=share_info['new_script'],
  93         subsidy=share_info['subsidy'],
  94         nonce=share_info['share_data']['nonce'],
  95         block_target=block_target,
  96         net=net,
  97     )
  98
  99 class Share(object):
 100     @classmethod
 101     def from_block(cls, block, net):
 102         return cls(net, block['header'], gentx_to_share_info(block['txs'][0]), other_txs=block['txs'][1:])
 103
 104     @classmethod
 105     def from_share1a(cls, share1a, net):
 106         return cls(net, **share1a)
 107
 108     @classmethod
 109     def from_share1b(cls, share1b, net):
 110         return cls(net, **share1b)
 111
 112     __slots__ = 'header previous_block share_info merkle_branch other_txs timestamp share_data new_script subsidy previous_hash previous_share_hash target nonce bitcoin_hash hash time_seen shared stored peer'.split(' ')
 113
 114     def __init__(self, net, header, share_info, merkle_branch=None, other_txs=None):
 115         if merkle_branch is None and other_txs is None:
 116             raise ValueError('need either merkle_branch or other_txs')
 117         if other_txs is not None:
 118             new_merkle_branch = calculate_merkle_branch([dict(version=0, tx_ins=[], tx_outs=[], lock_time=0)] + other_txs, 0)
 119             if merkle_branch is not None:
 120                 if merke_branch != new_merkle_branch:
 121                     raise ValueError('invalid merkle_branch and other_txs')
 122             merkle_branch = new_merkle_branch
 123
 124         if len(merkle_branch) > 16:
 125             raise ValueError('merkle_branch too long!')
 126
 127         self.header = header
 128         self.previous_block = header['previous_block']
 129         self.share_info = share_info
 130         self.merkle_branch = merkle_branch
 131         self.other_txs = other_txs
 132
 133         self.timestamp = self.header['timestamp']
 134
 135         self.share_data = self.share_info['share_data']
 136         self.new_script = self.share_info['new_script']
 137         self.subsidy = self.share_info['subsidy']
 138
 139         if len(self.new_script) > 100:
 140             raise ValueError('new_script too long!')
 141
 142         self.previous_hash = self.previous_share_hash = self.share_data['previous_share_hash']
 143         self.target = self.share_data['target']
 144         self.nonce = self.share_data['nonce']
 145
 146         if len(self.nonce) > 100:
 147             raise ValueError('nonce too long!')
 148
 149         self.bitcoin_hash = net.BITCOIN_POW_FUNC(header)
 150         self.hash = net.BITCOIN_POW_FUNC(header) # XXX was a bug in litecoin pull
 151
 152         if self.bitcoin_hash > self.target:
 153             print 'hash %x' % self.bitcoin_hash
 154             print 'targ %x' % self.target
 155             raise ValueError('not enough work!')
 156
 157         if script.get_sigop_count(self.new_script) > 1:
 158             raise ValueError('too many sigops!')
 159
 160         # XXX eww
 161         self.time_seen = time.time()
 162         self.shared = False
 163         self.stored = False
 164         self.peer = None
 165
 166     def as_block(self, tracker, net):
 167         if self.other_txs is None:
 168             raise ValueError('share does not contain all txs')
 169
 170         gentx = share_info_to_gentx(self.share_info, self.header['target'], tracker, net)
 171
 172         return dict(header=self.header, txs=[gentx] + self.other_txs)
 173
 174     def as_share1a(self):
 175         return dict(header=self.header, share_info=self.share_info, merkle_branch=self.merkle_branch)
 176
 177     def as_share1b(self):
 178         return dict(header=self.header, share_info=self.share_info, other_txs=self.other_txs)
 179
 180     def check(self, tracker, now, net):
 181         import time
 182         if self.previous_share_hash is not None:
 183             if self.header['timestamp'] <= math.median((s.timestamp for s in itertools.islice(tracker.get_chain_to_root(self.previous_share_hash), 11)), use_float=False):
 184                 raise ValueError('share from too far in the past!')
 185
 186         if self.header['timestamp'] > now + 2*60*60:
 187             raise ValueError('share from too far in the future!')
 188
 189         gentx = share_info_to_gentx(self.share_info, self.header['target'], tracker, net)
 190
 191         if len(gentx['tx_ins'][0]['script']) > 100:
 192             raise ValueError('''coinbase too large! %i bytes''' % (len(gentx['tx_ins'][0]['script']),))
 193
 194         if check_merkle_branch(gentx, self.merkle_branch) != self.header['merkle_root']:
 195             raise ValueError('''gentx doesn't match header via merkle_branch''')
 196
 197         if self.other_txs is not None:
 198             if bitcoin_data.merkle_hash([gentx] + self.other_txs) != self.header['merkle_root']:
 199                 raise ValueError('''gentx doesn't match header via other_txs''')
 200
 201             if len(bitcoin_data.block_type.pack(dict(header=self.header, txs=[gentx] + self.other_txs))) > 1000000 - 1000:
 202                 raise ValueError('''block size too large''')
 203
 204     def flag_shared(self):
 205         self.shared = True
 206
 207     def __repr__(self):
 208         return '<Share %s>' % (' '.join('%s=%r' % (k, getattr(self, k)) for k in self.__slots__),)
 209
 210 def get_pool_attempts_per_second(tracker, previous_share_hash, net, dist=None):
 211     if dist is None:
 212         dist = net.TARGET_LOOKBEHIND
 213     near = tracker.shares[previous_share_hash]
 214     far = tracker.shares[tracker.get_nth_parent_hash(previous_share_hash, dist - 1)]
 215     attempts = tracker.get_work(near.hash) - tracker.get_work(far.hash)
 216     time = near.timestamp - far.timestamp
 217     if time == 0:
 218         time = 1
 219     return attempts//time
 220
 221 def generate_transaction(tracker, previous_share_hash, new_script, subsidy, nonce, block_target, net):
 222     height, last = tracker.get_height_and_last(previous_share_hash)
 223     assert height >= net.CHAIN_LENGTH or last is None
 224     if height < net.TARGET_LOOKBEHIND:
 225         target = bitcoin_data.FloatingInteger.from_target_upper_bound(net.MAX_TARGET)
 226     else:
 227         attempts_per_second = get_pool_attempts_per_second(tracker, previous_share_hash, net)
 228         previous_share = tracker.shares[previous_share_hash] if previous_share_hash is not None else None
 229         pre_target = 2**256//(net.SHARE_PERIOD*attempts_per_second) - 1
 230         pre_target2 = math.clip(pre_target, (previous_share.target*9//10, previous_share.target*11//10))
 231         pre_target3 = math.clip(pre_target2, (0, net.MAX_TARGET))
 232         target = bitcoin_data.FloatingInteger.from_target_upper_bound(pre_target3)
 233
 234     attempts_to_block = bitcoin_data.target_to_average_attempts(block_target)
 235     max_weight = net.SPREAD * attempts_to_block
 236
 237     this_weight = min(bitcoin_data.target_to_average_attempts(target), max_weight)
 238     other_weights, other_weights_total = tracker.get_cumulative_weights(previous_share_hash, min(height, net.CHAIN_LENGTH), max(0, max_weight - this_weight))
 239     dest_weights, total_weight = math.add_dicts([{new_script: this_weight}, other_weights]), this_weight + other_weights_total
 240     assert total_weight == sum(dest_weights.itervalues())
 241
 242     if net.SCRIPT:
 243         amounts = dict((script, subsidy*(396*weight)//(400*total_weight)) for (script, weight) in dest_weights.iteritems())
 244         amounts[new_script] = amounts.get(new_script, 0) + subsidy*2//400
 245         amounts[net.SCRIPT] = amounts.get(net.SCRIPT, 0) + subsidy*2//400
 246         amounts[net.SCRIPT] = amounts.get(net.SCRIPT, 0) + subsidy - sum(amounts.itervalues()) # collect any extra
 247     else:
 248         amounts = dict((script, subsidy*(398*weight)//(400*total_weight)) for (script, weight) in dest_weights.iteritems())
 249         amounts[new_script] = amounts.get(new_script, 0) + subsidy*2//400
 250         amounts[new_script] = amounts.get(new_script, 0) + subsidy - sum(amounts.itervalues()) # collect any extra
 251
 252     if sum(amounts.itervalues()) != subsidy:
 253         raise ValueError()
 254     if any(x < 0 for x in amounts.itervalues()):
 255         raise ValueError()
 256
 257     pre_dests = sorted(amounts.iterkeys(), key=lambda script: (amounts[script], script))
 258     pre_dests = pre_dests[-4000:] # block length limit, unlikely to ever be hit
 259
 260     dests = sorted(pre_dests, key=lambda script: (script == new_script, script))
 261     assert dests[-1] == new_script
 262
 263     return dict(
 264         version=1,
 265         tx_ins=[dict(
 266             previous_output=None,
 267             sequence=None,
 268             script=coinbase_type.pack(dict(
 269                 identifier=net.IDENTIFIER,
 270                 share_data=dict(
 271                     previous_share_hash=previous_share_hash,
 272                     nonce=nonce,
 273                     target=target,
 274                 ),
 275             )),
 276         )],
 277         tx_outs=[dict(value=amounts[script], script=script) for script in dests if amounts[script]],
 278         lock_time=0,
 279     )
 280
 281
 282
 283 class OkayTracker(bitcoin_data.Tracker):
 284     def __init__(self, net):
 285         bitcoin_data.Tracker.__init__(self)
 286         self.net = net
 287         self.verified = bitcoin_data.Tracker()
 288         self.verified.get_nth_parent_hash = self.get_nth_parent_hash # self is a superset of self.verified
 289
 290         self.get_cumulative_weights = skiplists.WeightsSkipList(self)
 291
 292     def add(self, share, known_verified=False):
 293         bitcoin_data.Tracker.add(self, share)
 294         if known_verified:
 295             self.verified.add(share)
 296
 297     def attempt_verify(self, share, now):
 298         if share.hash in self.verified.shares:
 299             return True
 300         height, last = self.get_height_and_last(share.hash)
 301         if height < self.net.CHAIN_LENGTH + 1 and last is not None:
 302             raise AssertionError()
 303         try:
 304             share.check(self, now, self.net)
 305         except:
 306             log.err(None, 'Share check failed:')
 307             return False
 308         else:
 309             self.verified.add(share)
 310             return True
 311
 312     def think(self, ht, previous_block, now):
 313         desired = set()
 314
 315         # O(len(self.heads))
 316         #   make 'unverified heads' set?
 317         # for each overall head, attempt verification
 318         # if it fails, attempt on parent, and repeat
 319         # if no successful verification because of lack of parents, request parent
 320         bads = set()
 321         for head in set(self.heads) - set(self.verified.heads):
 322             head_height, last = self.get_height_and_last(head)
 323
 324             for share in itertools.islice(self.get_chain_known(head), None if last is None else min(5, max(0, head_height - self.net.CHAIN_LENGTH))):
 325                 if self.attempt_verify(share, now):
 326                     break
 327                 if share.hash in self.heads:
 328                     bads.add(share.hash)
 329             else:
 330                 if last is not None:
 331                     desired.add((self.shares[random.choice(list(self.reverse_shares[last]))].peer, last))
 332         for bad in bads:
 333             assert bad not in self.verified.shares
 334             assert bad in self.heads
 335             if p2pool.DEBUG:
 336                 print "BAD", bad
 337             self.remove(bad)
 338
 339         # try to get at least CHAIN_LENGTH height for each verified head, requesting parents if needed
 340         for head in list(self.verified.heads):
 341             head_height, last_hash = self.verified.get_height_and_last(head)
 342             last_height, last_last_hash = self.get_height_and_last(last_hash)
 343             # XXX review boundary conditions
 344             want = max(self.net.CHAIN_LENGTH - head_height, 0)
 345             can = max(last_height - 1 - self.net.CHAIN_LENGTH, 0) if last_last_hash is not None else last_height
 346             get = min(want, can)
 347             #print 'Z', head_height, last_hash is None, last_height, last_last_hash is None, want, can, get
 348             for share in itertools.islice(self.get_chain_known(last_hash), get):
 349                 if not self.attempt_verify(share, now):
 350                     break
 351             if head_height < self.net.CHAIN_LENGTH and last_last_hash is not None:
 352                 desired.add((self.verified.shares[random.choice(list(self.verified.reverse_shares[last_hash]))].peer, last_last_hash))
 353
 354         # decide best tree
 355         best_tail = max(self.verified.tails, key=lambda h: self.score(max(self.verified.tails[h], key=self.verified.get_height), ht)) if self.verified.tails else None
 356         # decide best verified head
 357         scores = sorted(self.verified.tails.get(best_tail, []), key=lambda h: (
 358             self.verified.get_work(self.verified.get_nth_parent_hash(h, min(5, self.verified.get_height(h)))),
 359             #self.verified.shares[h].peer is None,
 360             ht.get_min_height(self.verified.shares[h].previous_block),
 361             -self.verified.shares[h].time_seen
 362         ))
 363
 364
 365         if p2pool.DEBUG:
 366             print len(self.verified.tails), "chain tails and", len(self.verified.tails.get(best_tail, [])), 'chain heads. Top 10 tails:'
 367             if len(scores) > 10:
 368                 print '    ...'
 369             for h in scores[-10:]:
 370                 print '   ', format_hash(h), format_hash(self.verified.shares[h].previous_hash), (
 371                     self.verified.get_work(self.verified.get_nth_parent_hash(h, min(5, self.verified.get_height(h)))),
 372                     self.verified.shares[h].peer is None,
 373                     ht.get_min_height(self.verified.shares[h].previous_block),
 374                     -self.verified.shares[h].time_seen
 375                 )
 376
 377         # eat away at heads
 378         if scores:
 379             for i in xrange(1000):
 380                 to_remove = set()
 381                 for share_hash, tail in self.heads.iteritems():
 382                     if share_hash in scores[-5:]:
 383                         #print 1
 384                         continue
 385                     if self.shares[share_hash].time_seen > time.time() - 300:
 386                         #print 2
 387                         continue
 388                     if share_hash not in self.verified.shares and max(self.shares[after_tail_hash].time_seen for after_tail_hash in self.reverse_shares.get(tail)) > time.time() - 120: # XXX stupid
 389                         #print 3
 390                         continue
 391                     to_remove.add(share_hash)
 392                 if not to_remove:
 393                     break
 394                 for share_hash in to_remove:
 395                     self.remove(share_hash)
 396                     if share_hash in self.verified.shares:
 397                         self.verified.remove(share_hash)
 398                 #print "_________", to_remove
 399
 400         # drop tails
 401         for i in xrange(1000):
 402             to_remove = set()
 403             for tail, heads in self.tails.iteritems():
 404                 if min(self.get_height(head) for head in heads) < 2*self.net.CHAIN_LENGTH + 10:
 405                     continue
 406                 for aftertail in self.reverse_shares.get(tail, set()):
 407                     if len(self.reverse_shares[self.shares[aftertail].previous_hash]) > 1: # XXX
 408                         print "raw"
 409                         continue
 410                     to_remove.add(aftertail)
 411             if not to_remove:
 412                 break
 413             # if removed from this, it must be removed from verified
 414             #start = time.time()
 415             for aftertail in to_remove:
 416                 if self.shares[aftertail].previous_hash not in self.tails:
 417                     print "erk", aftertail, self.shares[aftertail].previous_hash
 418                     continue
 419                 self.remove(aftertail)
 420                 if aftertail in self.verified.shares:
 421                     self.verified.remove(aftertail)
 422             #end = time.time()
 423             #print "removed! %i %f" % (len(to_remove), (end - start)/len(to_remove))
 424
 425         best = scores[-1] if scores else None
 426
 427         if best is not None:
 428             best_share = self.verified.shares[best]
 429             if ht.get_min_height(best_share.header['previous_block']) < ht.get_min_height(previous_block) and best_share.bitcoin_hash != previous_block and best_share.peer is not None:
 430                 if p2pool.DEBUG:
 431                     print 'Stale detected! %x < %x' % (best_share.header['previous_block'], previous_block)
 432                 best = best_share.previous_hash
 433
 434         return best, desired
 435
 436     @memoize.memoize_with_backing(expiring_dict.ExpiringDict(5, get_touches=False))
 437     def score(self, share_hash, ht):
 438         head_height, last = self.verified.get_height_and_last(share_hash)
 439         score2 = 0
 440         attempts = 0
 441         max_height = 0
 442         share2_hash = self.verified.get_nth_parent_hash(share_hash, min(self.net.CHAIN_LENGTH//2, head_height//2)) if last is not None else share_hash
 443         for share in reversed(list(itertools.islice(self.verified.get_chain_known(share2_hash), self.net.CHAIN_LENGTH))):
 444             max_height = max(max_height, ht.get_min_height(share.header['previous_block']))
 445             attempts += bitcoin_data.target_to_average_attempts(share.target)
 446             this_score = attempts//(ht.get_highest_height() - max_height + 1)
 447             if this_score > score2:
 448                 score2 = this_score
 449         return min(head_height, self.net.CHAIN_LENGTH), score2
 450
 451 def format_hash(x):
 452     if x is None:
 453         return 'xxxxxxxx'
 454     return '%08x' % (x % 2**32)
 455
 456 class ShareStore(object):
 457     def __init__(self, prefix, net):
 458         self.filename = prefix
 459         self.net = net
 460         self.known = None # will be filename -> set of share hashes, set of verified hashes
 461
 462     def get_shares(self):
 463         if self.known is not None:
 464             raise AssertionError()
 465         known = {}
 466         filenames, next = self.get_filenames_and_next()
 467         for filename in filenames:
 468             share_hashes, verified_hashes = known.setdefault(filename, (set(), set()))
 469             with open(filename, 'rb') as f:
 470                 for line in f:
 471                     try:
 472                         type_id_str, data_hex = line.strip().split(' ')
 473                         type_id = int(type_id_str)
 474                         if type_id == 0:
 475                             share = Share.from_share1a(share1a_type.unpack(data_hex.decode('hex')), self.net)
 476                             yield 'share', share
 477                             share_hashes.add(share.hash)
 478                         elif type_id == 1:
 479                             share = Share.from_share1b(share1b_type.unpack(data_hex.decode('hex')), self.net)
 480                             yield 'share', share
 481                             share_hashes.add(share.hash)
 482                         elif type_id == 2:
 483                             verified_hash = int(data_hex, 16)
 484                             yield 'verified_hash', verified_hash
 485                             verified_hashes.add(verified_hash)
 486                         else:
 487                             raise NotImplementedError("share type %i" % (type_id,))
 488                     except Exception:
 489                         log.err(None, "Error while reading saved shares, continuing where left off:")
 490         self.known = known
 491
 492     def _add_line(self, line):
 493         filenames, next = self.get_filenames_and_next()
 494         if filenames and os.path.getsize(filenames[-1]) < 10e6:
 495             filename = filenames[-1]
 496         else:
 497             filename = next
 498
 499         with open(filename, 'ab') as f:
 500             f.write(line + '\n')
 501
 502         return filename
 503
 504     def add_share(self, share):
 505         if share.bitcoin_hash <= share.header['target']:
 506             type_id, data = 1, share1b_type.pack(share.as_share1b())
 507         else:
 508             type_id, data = 0, share1a_type.pack(share.as_share1a())
 509         filename = self._add_line("%i %s" % (type_id, data.encode('hex')))
 510         share_hashes, verified_hashes = self.known.setdefault(filename, (set(), set()))
 511         share_hashes.add(share.hash)
 512
 513     def add_verified_hash(self, share_hash):
 514         filename = self._add_line("%i %x" % (2, share_hash))
 515         share_hashes, verified_hashes = self.known.setdefault(filename, (set(), set()))
 516         verified_hashes.add(share_hash)
 517
 518     def get_filenames_and_next(self):
 519         suffixes = sorted(int(x[len(self.filename):]) for x in os.listdir('.') if x.startswith(self.filename) and x[len(self.filename):].isdigit())
 520         return [self.filename + str(suffix) for suffix in suffixes], self.filename + str(suffixes[-1] + 1) if suffixes else self.filename + str(0)
 521
 522     def forget_share(self, share_hash):
 523         for filename, (share_hashes, verified_hashes) in self.known.iteritems():
 524             if share_hash in share_hashes:
 525                 share_hashes.remove(share_hash)
 526         self.check_remove()
 527
 528     def forget_verified_share(self, share_hash):
 529         for filename, (share_hashes, verified_hashes) in self.known.iteritems():
 530             if share_hash in verified_hashes:
 531                 verified_hashes.remove(share_hash)
 532         self.check_remove()
 533
 534     def check_remove(self):
 535         to_remove = set()
 536         for filename, (share_hashes, verified_hashes) in self.known.iteritems():
 537             #print filename, len(share_hashes) + len(verified_hashes)
 538             if not share_hashes and not verified_hashes:
 539                 to_remove.add(filename)
 540         for filename in to_remove:
 541             self.known.pop(filename)
 542             os.remove(filename)
 543             print "REMOVED", filename
 544
 545 class BitcoinMainnet(networks.BitcoinMainnet):
 546     SHARE_PERIOD = 10 # seconds
 547     CHAIN_LENGTH = 24*60*60//5 # shares
 548     TARGET_LOOKBEHIND = 200 # shares
 549     SPREAD = 3 # blocks
 550     SCRIPT = '4104ffd03de44a6e11b9917f3a29f9443283d9871c9d743ef30d5eddcd37094b64d1b3d8090496b53256786bf5c82932ec23c3b74d9f05a6f95a8b5529352656664bac'.decode('hex')
 551     IDENTIFIER = 'fc70035c7a81bc6f'.decode('hex')
 552     PREFIX = '2472ef181efcd37b'.decode('hex')
 553     NAME = 'bitcoin'
 554     P2P_PORT = 9333
 555     MAX_TARGET = 2**256//2**32 - 1
 556     PERSIST = True
 557     WORKER_PORT = 9332
 558
 559 class BitcoinTestnet(networks.BitcoinTestnet):
 560     SHARE_PERIOD = 1 # seconds
 561     CHAIN_LENGTH = 24*60*60//5 # shares
 562     TARGET_LOOKBEHIND = 200 # shares
 563     SPREAD = 3 # blocks
 564     SCRIPT = '410403ad3dee8ab3d8a9ce5dd2abfbe7364ccd9413df1d279bf1a207849310465b0956e5904b1155ecd17574778f9949589ebfd4fb33ce837c241474a225cf08d85dac'.decode('hex')
 565     IDENTIFIER = '5fc2be2d4f0d6bfb'.decode('hex')
 566     PREFIX = '3f6057a15036f441'.decode('hex')
 567     NAME = 'bitcoin_testnet'
 568     P2P_PORT = 19333
 569     MAX_TARGET = 2**256//2**32 - 1
 570     PERSIST = False
 571     WORKER_PORT = 19332
 572
 573 class NamecoinMainnet(networks.NamecoinMainnet):
 574     SHARE_PERIOD = 10 # seconds
 575     CHAIN_LENGTH = 24*60*60//10 # shares
 576     TARGET_LOOKBEHIND = 3600//10 # shares
 577     SPREAD = 3 # blocks
 578     SCRIPT = '41043da5beb73f8f18cede1a41b0ed953123f1342b8e0216ab5bf71ed3e024201b4017f472bddb6041f17978d89ed8f8ed84f9e726b0bca80cacf96347c7153e8df0ac'.decode('hex')
 579     IDENTIFIER = 'd5b1192062c4c454'.decode('hex')
 580     PREFIX = 'b56f3d0fb24fc982'.decode('hex')
 581     NAME = 'namecoin'
 582     P2P_PORT = 9334
 583     MAX_TARGET = 2**256//2**32 - 1
 584     PERSIST = True
 585     WORKER_PORT = 9331
 586
 587 class NamecoinTestnet(networks.NamecoinTestnet):
 588     SHARE_PERIOD = 1 # seconds
 589     CHAIN_LENGTH = 24*60*60//5 # shares
 590     TARGET_LOOKBEHIND = 200 # shares
 591     SPREAD = 3 # blocks
 592     SCRIPT = '410403ad3dee8ab3d8a9ce5dd2abfbe7364ccd9413df1d279bf1a207849310465b0956e5904b1155ecd17574778f9949589ebfd4fb33ce837c241474a225cf08d85dac'.decode('hex')
 593     IDENTIFIER = '8dd303d014a01a60'.decode('hex')
 594     PREFIX = '4d6581d24f51acbf'.decode('hex')
 595     NAME = 'namecoin_testnet'
 596     P2P_PORT = 19334
 597     MAX_TARGET = 2**256//2**20 - 1
 598     PERSIST = False
 599     WORKER_PORT = 19331
 600
 601 class IxcoinMainnet(networks.IxcoinMainnet):
 602     SHARE_PERIOD = 10 # seconds
 603     CHAIN_LENGTH = 24*60*60//10 # shares
 604     TARGET_LOOKBEHIND = 3600//10 # shares
 605     SPREAD = 3 # blocks
 606     SCRIPT = '41043da5beb73f8f18cede1a41b0ed953123f1342b8e0216ab5bf71ed3e024201b4017f472bddb6041f17978d89ed8f8ed84f9e726b0bca80cacf96347c7153e8df0ac'.decode('hex')
 607     IDENTIFIER = '27b564116e2a2666'.decode('hex')
 608     PREFIX = '9dd6c4a619401f2f'.decode('hex')
 609     NAME = 'ixcoin'
 610     P2P_PORT = 9335
 611     MAX_TARGET = 2**256//2**32 - 1
 612     PERSIST = True
 613     WORKER_PORT = 9330
 614
 615 class IxcoinTestnet(networks.IxcoinTestnet):
 616     SHARE_PERIOD = 1 # seconds
 617     CHAIN_LENGTH = 24*60*60//5 # shares
 618     TARGET_LOOKBEHIND = 200 # shares
 619     SPREAD = 3 # blocks
 620     SCRIPT = '410403ad3dee8ab3d8a9ce5dd2abfbe7364ccd9413df1d279bf1a207849310465b0956e5904b1155ecd17574778f9949589ebfd4fb33ce837c241474a225cf08d85dac'.decode('hex')
 621     IDENTIFIER = '7430cbeb01249e44'.decode('hex')
 622     PREFIX = '7cfffda946709c1f'.decode('hex')
 623     NAME = 'ixcoin_testnet'
 624     P2P_PORT = 19335
 625     MAX_TARGET = 2**256//2**20 - 1
 626     PERSIST = False
 627     WORKER_PORT = 19330
 628
 629 class I0coinMainnet(networks.I0coinMainnet):
 630     SHARE_PERIOD = 10 # seconds
 631     CHAIN_LENGTH = 24*60*60//10 # shares
 632     TARGET_LOOKBEHIND = 3600//10 # shares
 633     SPREAD = 3 # blocks
 634     SCRIPT = '410403ad3dee8ab3d8a9ce5dd2abfbe7364ccd9413df1d279bf1a207849310465b0956e5904b1155ecd17574778f9949589ebfd4fb33ce837c241474a225cf08d85dac'.decode('hex')
 635     IDENTIFIER = 'b32e3f10c2ff221b'.decode('hex')
 636     PREFIX = '6155537ed977a3b5'.decode('hex')
 637     NAME = 'i0coin'
 638     P2P_PORT = 9336
 639     MAX_TARGET = 2**256//2**32 - 1
 640     PERSIST = False
 641     WORKER_PORT = 9329
 642
 643 class I0coinTestnet(networks.I0coinTestnet):
 644     SHARE_PERIOD = 1 # seconds
 645     CHAIN_LENGTH = 24*60*60//5 # shares
 646     TARGET_LOOKBEHIND = 200 # shares
 647     SPREAD = 3 # blocks
 648     SCRIPT = '410403ad3dee8ab3d8a9ce5dd2abfbe7364ccd9413df1d279bf1a207849310465b0956e5904b1155ecd17574778f9949589ebfd4fb33ce837c241474a225cf08d85dac'.decode('hex')
 649     IDENTIFIER = '7712c1a8181b5f2e'.decode('hex')
 650     PREFIX = '792d2e7d770fbe68'.decode('hex')
 651     NAME = 'i0coin_testnet'
 652     P2P_PORT = 19336
 653     MAX_TARGET = 2**256//2**20 - 1
 654     PERSIST = False
 655     WORKER_PORT = 19329
 656
 657 class SolidcoinMainnet(networks.SolidcoinMainnet):
 658     SHARE_PERIOD = 10
 659     CHAIN_LENGTH = 24*60*60//10 # shares
 660     TARGET_LOOKBEHIND = 3600//10 # shares
 661     SPREAD = 3 # blocks
 662     SCRIPT = bitcoin_data.pubkey_hash_to_script2(bitcoin_data.address_to_pubkey_hash('sMKZ1yxHETxPYKh4Z2anWnwZDJZU7ztroy', networks.SolidcoinMainnet))
 663     IDENTIFIER = '9cc9c421cca258cd'.decode('hex')
 664     PREFIX = 'c059125b8070f00a'.decode('hex')
 665     NAME = 'solidcoin'
 666     P2P_PORT = 9337
 667     MAX_TARGET = 2**256//2**32 - 1
 668     PERSIST = True
 669     WORKER_PORT = 9328
 670
 671 class LitecoinMainnet(networks.LitecoinMainnet):
 672     SHARE_PERIOD = 10 # seconds
 673     CHAIN_LENGTH = 24*60*60//5 # shares
 674     TARGET_LOOKBEHIND = 200 # shares
 675     SPREAD = 12 # blocks
 676     SCRIPT = None # no fee
 677     IDENTIFIER = 'e037d5b8c6923410'.decode('hex')
 678     PREFIX = '7208c1a53ef629b0'.decode('hex')
 679     NAME = 'litecoin'
 680     P2P_PORT = 9338
 681     MAX_TARGET = 2**256//2**20 - 1
 682     PERSIST = True
 683     WORKER_PORT = 9327
 684
 685 class LitecoinTestnet(networks.LitecoinTestnet):
 686     SHARE_PERIOD = 1 # seconds
 687     CHAIN_LENGTH = 24*60*60//5 # shares
 688     TARGET_LOOKBEHIND = 200 # shares
 689     SPREAD = 12 # blocks
 690     SCRIPT = None # no fee
 691     IDENTIFIER = 'cca5e24ec6408b1e'.decode('hex')
 692     PREFIX = 'ad9614f6466a39cf'.decode('hex')
 693     NAME = 'litecoin_testnet'
 694     P2P_PORT = 19338
 695     MAX_TARGET = 2**256//2**17 - 1
 696     PERSIST = False
 697     WORKER_PORT = 19327
 698
 699 nets = dict((net.NAME, net) for net in set([BitcoinMainnet, BitcoinTestnet, NamecoinMainnet, NamecoinTestnet, IxcoinMainnet, IxcoinTestnet, I0coinMainnet, I0coinTestnet, SolidcoinMainnet, LitecoinMainnet, LitecoinTestnet]))