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
  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):
 102         return cls(block['header'], gentx_to_share_info(block['txs'][0]), other_txs=block['txs'][1:])
 103
 104     @classmethod
 105     def from_share1a(cls, share1a):
 106         return cls(**share1a)
 107
 108     @classmethod
 109     def from_share1b(cls, share1b):
 110         return cls(**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, 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 = bitcoin_data.block_header_type.hash256(header)
 150         self.hash = share1a_type.hash256(self.as_share1a())
 151
 152         if self.bitcoin_hash > self.target:
 153             print 'hash', hex(self.bitcoin_hash)
 154             print 'targ', hex(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     amounts = dict((script, subsidy*(396*weight)//(400*total_weight)) for (script, weight) in dest_weights.iteritems())
 243     amounts[new_script] = amounts.get(new_script, 0) + subsidy*2//400
 244     amounts[net.SCRIPT] = amounts.get(net.SCRIPT, 0) + subsidy*2//400
 245     amounts[net.SCRIPT] = amounts.get(net.SCRIPT, 0) + subsidy - sum(amounts.itervalues()) # collect any extra
 246     if sum(amounts.itervalues()) != subsidy:
 247         raise ValueError()
 248     if any(x < 0 for x in amounts.itervalues()):
 249         raise ValueError()
 250
 251     pre_dests = sorted(amounts.iterkeys(), key=lambda script: (amounts[script], script))
 252     pre_dests = pre_dests[-4000:] # block length limit, unlikely to ever be hit
 253
 254     dests = sorted(pre_dests, key=lambda script: (script == new_script, script))
 255     assert dests[-1] == new_script
 256
 257     return dict(
 258         version=1,
 259         tx_ins=[dict(
 260             previous_output=None,
 261             sequence=None,
 262             script=coinbase_type.pack(dict(
 263                 identifier=net.IDENTIFIER,
 264                 share_data=dict(
 265                     previous_share_hash=previous_share_hash,
 266                     nonce=nonce,
 267                     target=target,
 268                 ),
 269             )),
 270         )],
 271         tx_outs=[dict(value=amounts[script], script=script) for script in dests if amounts[script]],
 272         lock_time=0,
 273     )
 274
 275
 276
 277 class OkayTracker(bitcoin_data.Tracker):
 278     def __init__(self, net):
 279         bitcoin_data.Tracker.__init__(self)
 280         self.net = net
 281         self.verified = bitcoin_data.Tracker()
 282         self.verified.get_nth_parent_hash = self.get_nth_parent_hash # self is a superset of self.verified
 283
 284         self.get_cumulative_weights = skiplists.WeightsSkipList(self)
 285
 286     def add(self, share, known_verified=False):
 287         bitcoin_data.Tracker.add(self, share)
 288         if known_verified:
 289             self.verified.add(share)
 290
 291     def attempt_verify(self, share, now):
 292         if share.hash in self.verified.shares:
 293             return True
 294         height, last = self.get_height_and_last(share.hash)
 295         if height < self.net.CHAIN_LENGTH + 1 and last is not None:
 296             raise AssertionError()
 297         try:
 298             share.check(self, now, self.net)
 299         except:
 300             log.err(None, 'Share check failed:')
 301             return False
 302         else:
 303             self.verified.add(share)
 304             return True
 305
 306     def think(self, ht, previous_block, now):
 307         desired = set()
 308
 309         # O(len(self.heads))
 310         #   make 'unverified heads' set?
 311         # for each overall head, attempt verification
 312         # if it fails, attempt on parent, and repeat
 313         # if no successful verification because of lack of parents, request parent
 314         bads = set()
 315         for head in set(self.heads) - set(self.verified.heads):
 316             head_height, last = self.get_height_and_last(head)
 317
 318             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))):
 319                 if self.attempt_verify(share, now):
 320                     break
 321                 if share.hash in self.heads:
 322                     bads.add(share.hash)
 323             else:
 324                 if last is not None:
 325                     desired.add((self.shares[random.choice(list(self.reverse_shares[last]))].peer, last))
 326         for bad in bads:
 327             assert bad not in self.verified.shares
 328             assert bad in self.heads
 329             if p2pool.DEBUG:
 330                 print "BAD", bad
 331             self.remove(bad)
 332
 333         # try to get at least CHAIN_LENGTH height for each verified head, requesting parents if needed
 334         for head in list(self.verified.heads):
 335             head_height, last_hash = self.verified.get_height_and_last(head)
 336             last_height, last_last_hash = self.get_height_and_last(last_hash)
 337             # XXX review boundary conditions
 338             want = max(self.net.CHAIN_LENGTH - head_height, 0)
 339             can = max(last_height - 1 - self.net.CHAIN_LENGTH, 0) if last_last_hash is not None else last_height
 340             get = min(want, can)
 341             #print 'Z', head_height, last_hash is None, last_height, last_last_hash is None, want, can, get
 342             for share in itertools.islice(self.get_chain_known(last_hash), get):
 343                 if not self.attempt_verify(share, now):
 344                     break
 345             if head_height < self.net.CHAIN_LENGTH and last_last_hash is not None:
 346                 desired.add((self.verified.shares[random.choice(list(self.verified.reverse_shares[last_hash]))].peer, last_last_hash))
 347
 348         # decide best tree
 349         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
 350         # decide best verified head
 351         scores = sorted(self.verified.tails.get(best_tail, []), key=lambda h: (
 352             self.verified.get_work(self.verified.get_nth_parent_hash(h, min(5, self.verified.get_height(h)))),
 353             #self.verified.shares[h].peer is None,
 354             ht.get_min_height(self.verified.shares[h].previous_block),
 355             -self.verified.shares[h].time_seen
 356         ))
 357
 358
 359         if p2pool.DEBUG:
 360             print len(self.verified.tails), "chain tails and", len(self.verified.tails.get(best_tail, [])), 'chain heads. Top 10 tails:'
 361             if len(scores) > 10:
 362                 print '    ...'
 363             for h in scores[-10:]:
 364                 print '   ', format_hash(h), format_hash(self.verified.shares[h].previous_hash), (
 365                     self.verified.get_work(self.verified.get_nth_parent_hash(h, min(5, self.verified.get_height(h)))),
 366                     self.verified.shares[h].peer is None,
 367                     ht.get_min_height(self.verified.shares[h].previous_block),
 368                     -self.verified.shares[h].time_seen
 369                 )
 370
 371         # eat away at heads
 372         if scores:
 373             for i in xrange(1000):
 374                 to_remove = set()
 375                 for share_hash, tail in self.heads.iteritems():
 376                     if share_hash in scores[-5:]:
 377                         #print 1
 378                         continue
 379                     if self.shares[share_hash].time_seen > time.time() - 300:
 380                         #print 2
 381                         continue
 382                     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
 383                         #print 3
 384                         continue
 385                     to_remove.add(share_hash)
 386                 if not to_remove:
 387                     break
 388                 for share_hash in to_remove:
 389                     self.remove(share_hash)
 390                     if share_hash in self.verified.shares:
 391                         self.verified.remove(share_hash)
 392                 #print "_________", to_remove
 393
 394         # drop tails
 395         for i in xrange(1000):
 396             to_remove = set()
 397             for tail, heads in self.tails.iteritems():
 398                 if min(self.get_height(head) for head in heads) < 2*self.net.CHAIN_LENGTH + 10:
 399                     continue
 400                 for aftertail in self.reverse_shares.get(tail, set()):
 401                     if len(self.reverse_shares[self.shares[aftertail].previous_hash]) > 1: # XXX
 402                         print "raw"
 403                         continue
 404                     to_remove.add(aftertail)
 405             if not to_remove:
 406                 break
 407             # if removed from this, it must be removed from verified
 408             #start = time.time()
 409             for aftertail in to_remove:
 410                 if self.shares[aftertail].previous_hash not in self.tails:
 411                     print "erk", aftertail, self.shares[aftertail].previous_hash
 412                     continue
 413                 self.remove(aftertail)
 414                 if aftertail in self.verified.shares:
 415                     self.verified.remove(aftertail)
 416             #end = time.time()
 417             #print "removed! %i %f" % (len(to_remove), (end - start)/len(to_remove))
 418
 419         best = scores[-1] if scores else None
 420
 421         if best is not None:
 422             best_share = self.verified.shares[best]
 423             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:
 424                 if p2pool.DEBUG:
 425                     print 'Stale detected! %x < %x' % (best_share.header['previous_block'], previous_block)
 426                 best = best_share.previous_hash
 427
 428         return best, desired
 429
 430     @memoize.memoize_with_backing(expiring_dict.ExpiringDict(5, get_touches=False))
 431     def score(self, share_hash, ht):
 432         head_height, last = self.verified.get_height_and_last(share_hash)
 433         score2 = 0
 434         attempts = 0
 435         max_height = 0
 436         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
 437         for share in reversed(list(itertools.islice(self.verified.get_chain_known(share2_hash), self.net.CHAIN_LENGTH))):
 438             max_height = max(max_height, ht.get_min_height(share.header['previous_block']))
 439             attempts += bitcoin_data.target_to_average_attempts(share.target)
 440             this_score = attempts//(ht.get_highest_height() - max_height + 1)
 441             if this_score > score2:
 442                 score2 = this_score
 443         return min(head_height, self.net.CHAIN_LENGTH), score2
 444
 445 def format_hash(x):
 446     if x is None:
 447         return 'xxxxxxxx'
 448     return '%08x' % (x % 2**32)
 449
 450 class ShareStore(object):
 451     def __init__(self, prefix, net):
 452         self.filename = prefix
 453         self.net = net
 454         self.known = None # will be filename -> set of share hashes, set of verified hashes
 455
 456     def get_shares(self):
 457         if self.known is not None:
 458             raise AssertionError()
 459         known = {}
 460         filenames, next = self.get_filenames_and_next()
 461         for filename in filenames:
 462             share_hashes, verified_hashes = known.setdefault(filename, (set(), set()))
 463             with open(filename, 'rb') as f:
 464                 for line in f:
 465                     try:
 466                         type_id_str, data_hex = line.strip().split(' ')
 467                         type_id = int(type_id_str)
 468                         if type_id == 0:
 469                             share = Share.from_share1a(share1a_type.unpack(data_hex.decode('hex')))
 470                             yield 'share', share
 471                             share_hashes.add(share.hash)
 472                         elif type_id == 1:
 473                             share = Share.from_share1b(share1b_type.unpack(data_hex.decode('hex')))
 474                             yield 'share', share
 475                             share_hashes.add(share.hash)
 476                         elif type_id == 2:
 477                             verified_hash = int(data_hex, 16)
 478                             yield 'verified_hash', verified_hash
 479                             verified_hashes.add(verified_hash)
 480                         else:
 481                             raise NotImplementedError("share type %i" % (type_id,))
 482                     except Exception:
 483                         log.err(None, "Error while reading saved shares, continuing where left off:")
 484         self.known = known
 485
 486     def _add_line(self, line):
 487         filenames, next = self.get_filenames_and_next()
 488         if filenames and os.path.getsize(filenames[-1]) < 10e6:
 489             filename = filenames[-1]
 490         else:
 491             filename = next
 492
 493         with open(filename, 'ab') as f:
 494             f.write(line + '\n')
 495
 496         return filename
 497
 498     def add_share(self, share):
 499         if share.bitcoin_hash <= share.header['target']:
 500             type_id, data = 1, share1b_type.pack(share.as_share1b())
 501         else:
 502             type_id, data = 0, share1a_type.pack(share.as_share1a())
 503         filename = self._add_line("%i %s" % (type_id, data.encode('hex')))
 504         share_hashes, verified_hashes = self.known.setdefault(filename, (set(), set()))
 505         share_hashes.add(share.hash)
 506
 507     def add_verified_hash(self, share_hash):
 508         filename = self._add_line("%i %x" % (2, share_hash))
 509         share_hashes, verified_hashes = self.known.setdefault(filename, (set(), set()))
 510         verified_hashes.add(share_hash)
 511
 512     def get_filenames_and_next(self):
 513         suffixes = sorted(int(x[len(self.filename):]) for x in os.listdir('.') if x.startswith(self.filename) and x[len(self.filename):].isdigit())
 514         return [self.filename + str(suffix) for suffix in suffixes], self.filename + str(suffixes[-1] + 1) if suffixes else self.filename + str(0)
 515
 516     def forget_share(self, share_hash):
 517         for filename, (share_hashes, verified_hashes) in self.known.iteritems():
 518             if share_hash in share_hashes:
 519                 share_hashes.remove(share_hash)
 520         self.check_remove()
 521
 522     def forget_verified_share(self, share_hash):
 523         for filename, (share_hashes, verified_hashes) in self.known.iteritems():
 524             if share_hash in verified_hashes:
 525                 verified_hashes.remove(share_hash)
 526         self.check_remove()
 527
 528     def check_remove(self):
 529         to_remove = set()
 530         for filename, (share_hashes, verified_hashes) in self.known.iteritems():
 531             #print filename, len(share_hashes) + len(verified_hashes)
 532             if not share_hashes and not verified_hashes:
 533                 to_remove.add(filename)
 534         for filename in to_remove:
 535             self.known.pop(filename)
 536             os.remove(filename)
 537             print "REMOVED", filename
 538
 539 class Mainnet(bitcoin_data.Mainnet):
 540     SHARE_PERIOD = 10 # seconds
 541     CHAIN_LENGTH = 24*60*60//5 # shares
 542     TARGET_LOOKBEHIND = 200 # shares
 543     SPREAD = 3 # blocks
 544     SCRIPT = '4104ffd03de44a6e11b9917f3a29f9443283d9871c9d743ef30d5eddcd37094b64d1b3d8090496b53256786bf5c82932ec23c3b74d9f05a6f95a8b5529352656664bac'.decode('hex')
 545     IDENTIFIER = 'fc70035c7a81bc6f'.decode('hex')
 546     PREFIX = '2472ef181efcd37b'.decode('hex')
 547     NAME = 'bitcoin'
 548     P2P_PORT = 9333
 549     MAX_TARGET = 2**256//2**32 - 1
 550     PERSIST = True
 551     WORKER_PORT = 9332
 552
 553 class Testnet(bitcoin_data.Testnet):
 554     SHARE_PERIOD = 1 # seconds
 555     CHAIN_LENGTH = 24*60*60//5 # shares
 556     TARGET_LOOKBEHIND = 200 # shares
 557     SPREAD = 3 # blocks
 558     SCRIPT = '410403ad3dee8ab3d8a9ce5dd2abfbe7364ccd9413df1d279bf1a207849310465b0956e5904b1155ecd17574778f9949589ebfd4fb33ce837c241474a225cf08d85dac'.decode('hex')
 559     IDENTIFIER = '5fc2be2d4f0d6bfb'.decode('hex')
 560     PREFIX = '3f6057a15036f441'.decode('hex')
 561     NAME = 'bitcoin_testnet'
 562     P2P_PORT = 19333
 563     MAX_TARGET = 2**256//2**32 - 1
 564     PERSIST = False
 565     WORKER_PORT = 19332
 566
 567 class NamecoinMainnet(namecoin.NamecoinMainnet):
 568     SHARE_PERIOD = 10 # seconds
 569     CHAIN_LENGTH = 24*60*60//10 # shares
 570     TARGET_LOOKBEHIND = 3600//10 # shares
 571     SPREAD = 3 # blocks
 572     SCRIPT = '41043da5beb73f8f18cede1a41b0ed953123f1342b8e0216ab5bf71ed3e024201b4017f472bddb6041f17978d89ed8f8ed84f9e726b0bca80cacf96347c7153e8df0ac'.decode('hex')
 573     IDENTIFIER = 'd5b1192062c4c454'.decode('hex')
 574     PREFIX = 'b56f3d0fb24fc982'.decode('hex')
 575     NAME = 'namecoin'
 576     P2P_PORT = 9334
 577     MAX_TARGET = 2**256//2**32 - 1
 578     PERSIST = True
 579     WORKER_PORT = 9331
 580
 581 class NamecoinTestnet(namecoin.NamecoinTestnet):
 582     SHARE_PERIOD = 1 # seconds
 583     CHAIN_LENGTH = 24*60*60//5 # shares
 584     TARGET_LOOKBEHIND = 200 # shares
 585     SPREAD = 3 # blocks
 586     SCRIPT = '410403ad3dee8ab3d8a9ce5dd2abfbe7364ccd9413df1d279bf1a207849310465b0956e5904b1155ecd17574778f9949589ebfd4fb33ce837c241474a225cf08d85dac'.decode('hex')
 587     IDENTIFIER = '8dd303d014a01a60'.decode('hex')
 588     PREFIX = '4d6581d24f51acbf'.decode('hex')
 589     NAME = 'namecoin_testnet'
 590     P2P_PORT = 19334
 591     MAX_TARGET = 2**256//2**20 - 1
 592     PERSIST = False
 593     WORKER_PORT = 19331
 594
 595 class IxcoinMainnet(ixcoin.IxcoinMainnet):
 596     SHARE_PERIOD = 10 # seconds
 597     CHAIN_LENGTH = 24*60*60//10 # shares
 598     TARGET_LOOKBEHIND = 3600//10 # shares
 599     SPREAD = 3 # blocks
 600     SCRIPT = '41043da5beb73f8f18cede1a41b0ed953123f1342b8e0216ab5bf71ed3e024201b4017f472bddb6041f17978d89ed8f8ed84f9e726b0bca80cacf96347c7153e8df0ac'.decode('hex')
 601     IDENTIFIER = '27b564116e2a2666'.decode('hex')
 602     PREFIX = '9dd6c4a619401f2f'.decode('hex')
 603     NAME = 'ixcoin'
 604     P2P_PORT = 9335
 605     MAX_TARGET = 2**256//2**32 - 1
 606     PERSIST = True
 607     WORKER_PORT = 9330
 608
 609 class IxcoinTestnet(ixcoin.IxcoinTestnet):
 610     SHARE_PERIOD = 1 # seconds
 611     CHAIN_LENGTH = 24*60*60//5 # shares
 612     TARGET_LOOKBEHIND = 200 # shares
 613     SPREAD = 3 # blocks
 614     SCRIPT = '410403ad3dee8ab3d8a9ce5dd2abfbe7364ccd9413df1d279bf1a207849310465b0956e5904b1155ecd17574778f9949589ebfd4fb33ce837c241474a225cf08d85dac'.decode('hex')
 615     IDENTIFIER = '7430cbeb01249e44'.decode('hex')
 616     PREFIX = '7cfffda946709c1f'.decode('hex')
 617     NAME = 'ixcoin_testnet'
 618     P2P_PORT = 19335
 619     MAX_TARGET = 2**256//2**20 - 1
 620     PERSIST = False
 621     WORKER_PORT = 19330
 622
 623 class I0coinMainnet(i0coin.I0coinMainnet):
 624     SHARE_PERIOD = 10 # seconds
 625     CHAIN_LENGTH = 24*60*60//10 # shares
 626     TARGET_LOOKBEHIND = 3600//10 # shares
 627     SPREAD = 3 # blocks
 628     SCRIPT = '410403ad3dee8ab3d8a9ce5dd2abfbe7364ccd9413df1d279bf1a207849310465b0956e5904b1155ecd17574778f9949589ebfd4fb33ce837c241474a225cf08d85dac'.decode('hex')
 629     IDENTIFIER = 'b32e3f10c2ff221b'.decode('hex')
 630     PREFIX = '6155537ed977a3b5'.decode('hex')
 631     NAME = 'i0coin'
 632     P2P_PORT = 9336
 633     MAX_TARGET = 2**256//2**32 - 1
 634     PERSIST = False
 635     WORKER_PORT = 9329
 636
 637 class I0coinTestnet(i0coin.I0coinTestnet):
 638     SHARE_PERIOD = 1 # seconds
 639     CHAIN_LENGTH = 24*60*60//5 # shares
 640     TARGET_LOOKBEHIND = 200 # shares
 641     SPREAD = 3 # blocks
 642     SCRIPT = '410403ad3dee8ab3d8a9ce5dd2abfbe7364ccd9413df1d279bf1a207849310465b0956e5904b1155ecd17574778f9949589ebfd4fb33ce837c241474a225cf08d85dac'.decode('hex')
 643     IDENTIFIER = '7712c1a8181b5f2e'.decode('hex')
 644     PREFIX = '792d2e7d770fbe68'.decode('hex')
 645     NAME = 'i0coin_testnet'
 646     P2P_PORT = 19336
 647     MAX_TARGET = 2**256//2**20 - 1
 648     PERSIST = False
 649     WORKER_PORT = 19329
 650
 651 class SolidcoinMainnet(solidcoin.SolidcoinMainnet):
 652     SHARE_PERIOD = 10
 653     CHAIN_LENGTH = 24*60*60//10 # shares
 654     TARGET_LOOKBEHIND = 3600//10 # shares
 655     SPREAD = 3 # blocks
 656     SCRIPT = bitcoin_data.pubkey_hash_to_script2(bitcoin_data.address_to_pubkey_hash('sMKZ1yxHETxPYKh4Z2anWnwZDJZU7ztroy', solidcoin.SolidcoinMainnet))
 657     IDENTIFIER = '9cc9c421cca258cd'.decode('hex')
 658     PREFIX = 'c059125b8070f00a'.decode('hex')
 659     NAME = 'solidcoin'
 660     P2P_PORT = 9337
 661     MAX_TARGET = 2**256//2**32 - 1
 662     PERSIST = True
 663     WORKER_PORT = 9328
 664
 665 nets = dict((net.NAME, net) for net in set([Mainnet, Testnet, NamecoinMainnet, NamecoinTestnet, IxcoinMainnet, IxcoinTestnet, I0coinMainnet, I0coinTestnet, SolidcoinMainnet]))