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