Exemplo n.º 1
0
Arquivo: work.py Projeto: roy7/p2pool
 def get_user_details(self, username):
     contents = re.split('([+/])', username)
     assert len(contents) % 2 == 1
     
     user, contents2 = contents[0], contents[1:]
     
     desired_pseudoshare_target = None
     desired_share_target = None
     for symbol, parameter in zip(contents2[::2], contents2[1::2]):
         if symbol == '+':
             try:
                 desired_pseudoshare_target = bitcoin_data.difficulty_to_target_alt(float(parameter), self.node.net.PARENT.DUMB_SCRYPT_DIFF)
             except:
                 if p2pool.DEBUG:
                     log.err()
         elif symbol == '/':
             try:
                 desired_share_target = bitcoin_data.difficulty_to_target_alt(float(parameter), self.node.net.PARENT.DUMB_SCRYPT_DIFF)
             except:
                 if p2pool.DEBUG:
                     log.err()
     
     if random.uniform(0, 100) < self.worker_fee:
         pubkey_hash = self.my_pubkey_hash
     else:
         try:
             pubkey_hash = bitcoin_data.address_to_pubkey_hash(user, self.node.net.PARENT)
         except: # XXX blah
             pubkey_hash = self.my_pubkey_hash
     
     return user, pubkey_hash, desired_share_target, desired_pseudoshare_target
Exemplo n.º 2
0
    def get_user_details(self, username):
        contents = re.split('([+/])', username)
        assert len(contents) % 2 == 1

        user, contents2 = contents[0], contents[1:]

        desired_pseudoshare_target = None
        desired_share_target = None
        for symbol, parameter in zip(contents2[::2], contents2[1::2]):
            if symbol == '+':
                try:
                    desired_pseudoshare_target = bitcoin_data.difficulty_to_target_alt(
                        float(parameter),
                        self.node.net.PARENT.DUMB_SCRYPT_DIFF)
                except:
                    if p2pool.DEBUG:
                        log.err()
            elif symbol == '/':
                try:
                    desired_share_target = bitcoin_data.difficulty_to_target_alt(
                        float(parameter),
                        self.node.net.PARENT.DUMB_SCRYPT_DIFF)
                except:
                    if p2pool.DEBUG:
                        log.err()
        if self.args.address == 'dynamic':
            i = self.pubkeys.weighted()
            pubkey_hash = self.pubkeys.keys[i]

            c = time.time()
            if (c - self.pubkeys.stamp) > self.args.timeaddresses:
                self.freshen_addresses(c)

        if random.uniform(0, 100) < self.worker_fee:
            pubkey_hash = self.my_pubkey_hash
        else:
            try:
                pubkey_hash = bitcoin_data.address_to_pubkey_hash(
                    user, self.node.net.PARENT)
            except:  # XXX blah
                if self.args.address != 'dynamic':
                    pubkey_hash = self.my_pubkey_hash

        return user, pubkey_hash, desired_share_target, desired_pseudoshare_target
Exemplo n.º 3
0
    def get_work(self, user, pubkey_hash, desired_share_target,
                 desired_pseudoshare_target):
        global print_throttle
        if (self.node.p2p_node is None or len(self.node.p2p_node.peers)
                == 0) and self.node.net.PERSIST:
            raise jsonrpc.Error_for_code(-12345)(
                u'p2pool is not connected to any peers')
        if self.node.best_share_var.value is None and self.node.net.PERSIST:
            raise jsonrpc.Error_for_code(-12345)(
                u'p2pool is downloading shares')
        if set(r[1:] if r.startswith('!') else r
               for r in self.node.bitcoind_work.value['rules']) - set(
                   getattr(self.node.net, 'SOFTFORKS_REQUIRED', [])):
            raise jsonrpc.Error_for_code(-12345)(u'unknown rule activated')

        if self.merged_work.value:
            tree, size = bitcoin_data.make_auxpow_tree(self.merged_work.value)
            mm_hashes = [
                self.merged_work.value.get(tree.get(i), dict(hash=0))['hash']
                for i in xrange(size)
            ]
            mm_data = '\xfa\xbemm' + bitcoin_data.aux_pow_coinbase_type.pack(
                dict(
                    merkle_root=bitcoin_data.merkle_hash(mm_hashes),
                    size=size,
                    nonce=0,
                ))
            mm_later = [
                (aux_work, mm_hashes.index(aux_work['hash']), mm_hashes)
                for chain_id, aux_work in self.merged_work.value.iteritems()
            ]
        else:
            mm_data = ''
            mm_later = []

        tx_hashes = [
            bitcoin_data.hash256(bitcoin_data.tx_type.pack(tx))
            for tx in self.current_work.value['transactions']
        ]
        tx_map = dict(zip(tx_hashes, self.current_work.value['transactions']))

        previous_share = self.node.tracker.items[
            self.node.best_share_var.
            value] if self.node.best_share_var.value is not None else None
        if previous_share is None:
            share_type = p2pool_data.Share
        else:
            previous_share_type = type(previous_share)

            if previous_share_type.SUCCESSOR is None or self.node.tracker.get_height(
                    previous_share.hash) < self.node.net.CHAIN_LENGTH:
                share_type = previous_share_type
            else:
                successor_type = previous_share_type.SUCCESSOR

                counts = p2pool_data.get_desired_version_counts(
                    self.node.tracker,
                    self.node.tracker.get_nth_parent_hash(
                        previous_share.hash,
                        self.node.net.CHAIN_LENGTH * 9 // 10),
                    self.node.net.CHAIN_LENGTH // 10)
                upgraded = counts.get(successor_type.VERSION, 0) / sum(
                    counts.itervalues())
                if upgraded > .65:
                    print 'Switchover imminent. Upgraded: %.3f%% Threshold: %.3f%%' % (
                        upgraded * 100, 95)
                # Share -> NewShare only valid if 95% of hashes in [net.CHAIN_LENGTH*9//10, net.CHAIN_LENGTH] for new version
                if counts.get(successor_type.VERSION,
                              0) > sum(counts.itervalues()) * 95 // 100:
                    share_type = successor_type
                else:
                    share_type = previous_share_type

        if desired_share_target is None:
            desired_share_target = 2**256 - 1
            local_hash_rate = self._estimate_local_hash_rate()
            if local_hash_rate is not None:
                desired_share_target = min(
                    desired_share_target,
                    bitcoin_data.average_attempts_to_target(
                        local_hash_rate * self.node.net.SHARE_PERIOD / 0.0167)
                )  # limit to 1.67% of pool shares by modulating share difficulty

            local_addr_rates = self.get_local_addr_rates()
            lookbehind = 3600 // self.node.net.SHARE_PERIOD
            block_subsidy = self.node.bitcoind_work.value['subsidy']
            if previous_share is not None and self.node.tracker.get_height(
                    previous_share.hash) > lookbehind:
                expected_payout_per_block = local_addr_rates.get(pubkey_hash, 0)/p2pool_data.get_pool_attempts_per_second(self.node.tracker, self.node.best_share_var.value, lookbehind) \
                    * block_subsidy*(1-self.donation_percentage/100) # XXX doesn't use global stale rate to compute pool hash
                if expected_payout_per_block < self.node.net.PARENT.DUST_THRESHOLD:
                    desired_share_target = min(
                        desired_share_target,
                        bitcoin_data.average_attempts_to_target(
                            (bitcoin_data.target_to_average_attempts(
                                self.node.bitcoind_work.value['bits'].target) *
                             self.node.net.SPREAD) *
                            self.node.net.PARENT.DUST_THRESHOLD /
                            block_subsidy))

        if True:
            share_info, gentx, other_transaction_hashes, get_share = share_type.generate_transaction(
                tracker=self.node.tracker,
                share_data=dict(
                    previous_share_hash=self.node.best_share_var.value,
                    coinbase=(script.create_push_script([
                        self.current_work.value['height'],
                    ] + ([mm_data] if mm_data else []) + []) +
                              self.current_work.value['coinbaseflags'])[:100],
                    nonce=random.randrange(2**32),
                    pubkey_hash=pubkey_hash,
                    subsidy=self.current_work.value['subsidy'],
                    donation=math.perfect_round(
                        65535 * self.donation_percentage / 100),
                    stale_info=(
                        lambda (orphans, doas), total,
                        (orphans_recorded_in_chain, doas_recorded_in_chain
                         ): 'orphan'
                        if orphans > orphans_recorded_in_chain else 'doa'
                        if doas > doas_recorded_in_chain else None)(
                            *self.get_stale_counts()),
                    desired_version=(share_type.SUCCESSOR
                                     if share_type.SUCCESSOR is not None else
                                     share_type).VOTING_VERSION,
                ),
                block_target=self.current_work.value['bits'].target,
                desired_timestamp=int(time.time() + 0.5),
                desired_target=desired_share_target,
                ref_merkle_link=dict(branch=[], index=0),
                desired_other_transaction_hashes_and_fees=zip(
                    tx_hashes, self.current_work.value['transaction_fees']),
                net=self.node.net,
                known_txs=tx_map,
                base_subsidy=self.node.net.PARENT.SUBSIDY_FUNC(
                    self.current_work.value['height']),
            )

        packed_gentx = bitcoin_data.tx_id_type.pack(
            gentx)  # stratum miners work with stripped transactions
        other_transactions = [
            tx_map[tx_hash] for tx_hash in other_transaction_hashes
        ]

        mm_later = [
            (dict(aux_work,
                  target=aux_work['target'] if aux_work['target'] != 'p2pool'
                  else share_info['bits'].target), index, hashes)
            for aux_work, index, hashes in mm_later
        ]

        if desired_pseudoshare_target is None:
            #target = 2**256-1
            #DUMB_SCR
            #target = bitcoin_data.difficulty_to_target(float(1.0 / self.node.net.PARENT.DUMB_SCRYPT_DIFF))
            #local_hash_rate = self._estimate_local_hash_rate()
            #if local_hash_rate is not None:
            #target = min(target, bitcoin_data.average_attempts_to_target(local_hash_rate * 1)) # limit to 1 share response every second by modulating pseudoshare difficulty
            #target = bitcoin_data.average_attempts_to_target(local_hash_rate * 1) # limit to 1 share response every second by modulating pseudoshare difficulty
            target = bitcoin_data.difficulty_to_target_alt(
                self.min_difficulty, self.node.net.PARENT.DUMB_SCRYPT_DIFF)
            if self.share_rate is not None:
                if self.share_rate_type == 'address':  # per-address
                    if local_addr_rates is not None:
                        local_rate = local_addr_rates.get(pubkey_hash, 0)
                    else:
                        local_rate = self.get_local_addr_rate(pubkey_hash)
                else:  # per-miner
                    local_rate = self.get_miner_rate(user)
                if local_rate > 0:
                    target = min(
                        target,
                        bitcoin_data.average_attempts_to_target(
                            local_rate * 60 / self.share_rate))
            else:  # per-node
                local_hash_rate = self._estimate_local_hash_rate()
                if local_hash_rate is not None:
                    target = min(
                        target,
                        bitcoin_data.average_attempts_to_target(
                            local_hash_rate * 1)
                    )  # limit to 1 share response every second by modulating pseudoshare difficulty
            difficulty = bitcoin_data.target_to_difficulty_alt(
                target, self.node.net.PARENT.DUMB_SCRYPT_DIFF)
            rounded_difficulty = 1
            if difficulty >= 1:
                while (rounded_difficulty +
                       rounded_difficulty * 2) / 2 < difficulty:
                    rounded_difficulty = rounded_difficulty * 2
            else:
                while (rounded_difficulty +
                       rounded_difficulty / 2) / 2 >= difficulty:
                    rounded_difficulty = rounded_difficulty / 2
            target = bitcoin_data.difficulty_to_target_alt(
                rounded_difficulty, self.node.net.PARENT.DUMB_SCRYPT_DIFF)
        else:
            target = desired_pseudoshare_target
        target = max(target, share_info['bits'].target)
        for aux_work, index, hashes in mm_later:
            target = max(target, aux_work['target'])
        target = math.clip(target, self.node.net.PARENT.SANE_TARGET_RANGE)

        getwork_time = time.time()
        lp_count = self.new_work_event.times
        merkle_link = bitcoin_data.calculate_merkle_link(
            [None] + other_transaction_hashes, 0) if share_info.get(
                'segwit_data', None
            ) is None else share_info['segwit_data']['txid_merkle_link']

        if print_throttle is 0.0:
            print_throttle = time.time()
        else:
            current_time = time.time()
            if (current_time - print_throttle) > 5.0:
                print 'New work for worker! Difficulty: %.06f Share difficulty: %.06f Total block value: %.6f %s including %i transactions' % (
                    bitcoin_data.target_to_difficulty_alt(
                        target, self.node.net.PARENT.DUMB_SCRYPT_DIFF),
                    bitcoin_data.target_to_difficulty_alt(
                        share_info['bits'].target,
                        self.node.net.PARENT.DUMB_SCRYPT_DIFF),
                    self.current_work.value['subsidy'] * 1e-8,
                    self.node.net.PARENT.SYMBOL,
                    len(self.current_work.value['transactions']),
                )
                print_throttle = time.time()

        #need this for stats
        self.last_work_shares.value[bitcoin_data.pubkey_hash_to_address(
            pubkey_hash, self.node.net.PARENT)] = share_info['bits']

        ba = dict(
            version=max(self.current_work.value['version'], 0x20000000),
            previous_block=self.current_work.value['previous_block'],
            merkle_link=merkle_link,
            coinb1=packed_gentx[:-self.COINBASE_NONCE_LENGTH - 4],
            coinb2=packed_gentx[-4:],
            timestamp=self.current_work.value['time'],
            bits=self.current_work.value['bits'],
            share_target=target,
        )

        received_header_hashes = set()

        def got_response(header, user, coinbase_nonce):
            assert len(coinbase_nonce) == self.COINBASE_NONCE_LENGTH
            new_packed_gentx = packed_gentx[:-self.COINBASE_NONCE_LENGTH - 4] + coinbase_nonce + packed_gentx[
                -4:] if coinbase_nonce != '\0' * self.COINBASE_NONCE_LENGTH else packed_gentx
            new_gentx = bitcoin_data.tx_type.unpack(
                new_packed_gentx
            ) if coinbase_nonce != '\0' * self.COINBASE_NONCE_LENGTH else gentx
            if bitcoin_data.is_segwit_tx(
                    gentx
            ):  # reintroduce witness data to the gentx produced by stratum miners
                new_gentx['marker'] = 0
                new_gentx['flag'] = gentx['flag']
                new_gentx['witness'] = gentx['witness']

            header_hash = bitcoin_data.hash256(
                bitcoin_data.block_header_type.pack(header))
            pow_hash = self.node.net.PARENT.POW_FUNC(
                bitcoin_data.block_header_type.pack(header))
            try:
                if pow_hash <= header['bits'].target or p2pool.DEBUG:
                    helper.submit_block(
                        dict(header=header,
                             txs=[new_gentx] + other_transactions), False,
                        self.node.factory, self.node.bitcoind,
                        self.node.bitcoind_work, self.node.net)
                    if pow_hash <= header['bits'].target:
                        print
                        print 'GOT BLOCK FROM MINER! Passing to bitcoind! %s%064x' % (
                            self.node.net.PARENT.BLOCK_EXPLORER_URL_PREFIX,
                            header_hash)
                        print
            except:
                log.err(None, 'Error while processing potential block:')

            user, _, _, _ = self.get_user_details(user)
            assert header['previous_block'] == ba['previous_block']
            assert header['merkle_root'] == bitcoin_data.check_merkle_link(
                bitcoin_data.hash256(new_packed_gentx), merkle_link)
            assert header['bits'] == ba['bits']

            on_time = self.new_work_event.times == lp_count

            for aux_work, index, hashes in mm_later:
                try:
                    if pow_hash <= aux_work['target'] or p2pool.DEBUG:
                        df = deferral.retry(
                            'Error submitting merged block: (will retry)', 10,
                            10)(aux_work['merged_proxy'].rpc_getauxblock)(
                                pack.IntType(256, 'big').pack(
                                    aux_work['hash']).encode('hex'),
                                bitcoin_data.aux_pow_type.pack(
                                    dict(
                                        merkle_tx=dict(
                                            tx=new_gentx,
                                            block_hash=header_hash,
                                            merkle_link=merkle_link,
                                        ),
                                        merkle_link=bitcoin_data.
                                        calculate_merkle_link(hashes, index),
                                        parent_block_header=header,
                                    )).encode('hex'),
                            )

                        @df.addCallback
                        def _(result, aux_work=aux_work):
                            if result != (pow_hash <= aux_work['target']):
                                print >> sys.stderr, 'Merged block submittal result: %s Expected: %s' % (
                                    result, pow_hash <= aux_work['target'])
                            else:
                                print 'Merged block submittal result: %s' % (
                                    result, )

                        @df.addErrback
                        def _(err):
                            log.err(err, 'Error submitting merged block:')
                except:
                    log.err(None, 'Error while processing merged mining POW:')

            if pow_hash <= share_info[
                    'bits'].target and header_hash not in received_header_hashes:
                last_txout_nonce = pack.IntType(
                    8 * self.COINBASE_NONCE_LENGTH).unpack(coinbase_nonce)
                share = get_share(header, last_txout_nonce)

                print 'GOT SHARE! %s %s prev %s age %.2fs%s' % (
                    user,
                    p2pool_data.format_hash(share.hash),
                    p2pool_data.format_hash(share.previous_hash),
                    time.time() - getwork_time,
                    ' DEAD ON ARRIVAL' if not on_time else '',
                )
                self.my_share_hashes.add(share.hash)
                if not on_time:
                    self.my_doa_share_hashes.add(share.hash)

                self.node.tracker.add(share)
                self.node.set_best_share()

                try:
                    if (pow_hash <= header['bits'].target or
                            p2pool.DEBUG) and self.node.p2p_node is not None:
                        self.node.p2p_node.broadcast_share(share.hash)
                except:
                    log.err(None, 'Error forwarding block solution:')

                self.share_received.happened(
                    bitcoin_data.target_to_average_attempts(share.target),
                    not on_time, share.hash)

            self.total_hashes += 1

            if pow_hash > target:
                print 'Worker %s submitted share with hash > target:' % (
                    user, )
                print '    Hash:   %56x' % (pow_hash, )
                print '    Target: %56x' % (target, )
                self.invalid_hashes += 1
            elif header_hash in received_header_hashes:
                print >> sys.stderr, 'Worker %s submitted share more than once!' % (
                    user, )
            else:
                received_header_hashes.add(header_hash)

                self.pseudoshare_received.happened(
                    bitcoin_data.target_to_average_attempts(target),
                    not on_time, user)
                self.recent_shares_ts_work.append(
                    (time.time(),
                     bitcoin_data.target_to_average_attempts(target)))
                while len(self.recent_shares_ts_work) > 50:
                    self.recent_shares_ts_work.pop(0)
                self.local_rate_monitor.add_datum(
                    dict(work=bitcoin_data.target_to_average_attempts(target),
                         dead=not on_time,
                         user=user,
                         share_target=share_info['bits'].target))
                self.local_addr_rate_monitor.add_datum(
                    dict(work=bitcoin_data.target_to_average_attempts(target),
                         pubkey_hash=pubkey_hash))

            return on_time

        return ba, got_response
Exemplo n.º 4
0
Arquivo: work.py Projeto: roy7/p2pool
    def get_work(self, user, pubkey_hash, desired_share_target, desired_pseudoshare_target):
        if self.node.best_share_var.value is None and self.node.net.PERSIST:
            raise jsonrpc.Error_for_code(-12345)(u'p2pool is downloading shares')
        
        if self.merged_work.value:
            tree, size = bitcoin_data.make_auxpow_tree(self.merged_work.value)
            mm_hashes = [self.merged_work.value.get(tree.get(i), dict(hash=0))['hash'] for i in xrange(size)]
            mm_data = '\xfa\xbemm' + bitcoin_data.aux_pow_coinbase_type.pack(dict(
                merkle_root=bitcoin_data.merkle_hash(mm_hashes),
                size=size,
                nonce=0,
            ))
            mm_later = [(aux_work, mm_hashes.index(aux_work['hash']), mm_hashes) for chain_id, aux_work in self.merged_work.value.iteritems()]
        else:
            mm_data = ''
            mm_later = []
        
        tx_hashes = [bitcoin_data.hash256(bitcoin_data.tx_type.pack(tx)) for tx in self.current_work.value['transactions']]
        tx_map = dict(zip(tx_hashes, self.current_work.value['transactions']))
        
        previous_share = self.node.tracker.items[self.node.best_share_var.value] if self.node.best_share_var.value is not None else None
        if previous_share is None:
            share_type = p2pool_data.Share
        else:
            previous_share_type = type(previous_share)
            
            if previous_share_type.SUCCESSOR is None or self.node.tracker.get_height(previous_share.hash) < self.node.net.CHAIN_LENGTH:
                share_type = previous_share_type
            else:
                successor_type = previous_share_type.SUCCESSOR
                
                counts = p2pool_data.get_desired_version_counts(self.node.tracker,
                    self.node.tracker.get_nth_parent_hash(previous_share.hash, self.node.net.CHAIN_LENGTH*9//10), self.node.net.CHAIN_LENGTH//10)
                upgraded = counts.get(successor_type.VERSION, 0)/sum(counts.itervalues())
                if upgraded > .65:
                    print 'Switchover imminent. Upgraded: %.3f%% Threshold: %.3f%%' % (upgraded*100, 95)
                print 
                # Share -> NewShare only valid if 95% of hashes in [net.CHAIN_LENGTH*9//10, net.CHAIN_LENGTH] for new version
                if counts.get(successor_type.VERSION, 0) > sum(counts.itervalues())*95//100:
                    share_type = successor_type
                else:
                    share_type = previous_share_type
        
        local_addr_rates = self.get_local_addr_rates()
        
        if desired_share_target is None:
            desired_share_target = 2**256-1
            local_hash_rate = local_addr_rates.get(pubkey_hash, 0)
            if local_hash_rate > 0.0:
                desired_share_target = min(desired_share_target,
                    bitcoin_data.average_attempts_to_target(local_hash_rate * self.node.net.SHARE_PERIOD / 0.0167)) # limit to 1.67% of pool shares by modulating share difficulty
            lookbehind = 3600//self.node.net.SHARE_PERIOD
            block_subsidy = self.node.bitcoind_work.value['subsidy']
            if previous_share is not None and self.node.tracker.get_height(previous_share.hash) > lookbehind:
                expected_payout_per_block = local_addr_rates.get(pubkey_hash, 0)/p2pool_data.get_pool_attempts_per_second(self.node.tracker, self.node.best_share_var.value, lookbehind) \
                    * block_subsidy*(1-self.donation_percentage/100) # XXX doesn't use global stale rate to compute pool hash
                if expected_payout_per_block < self.node.net.PARENT.DUST_THRESHOLD:
                    desired_share_target = min(desired_share_target,
                        bitcoin_data.average_attempts_to_target((bitcoin_data.target_to_average_attempts(self.node.bitcoind_work.value['bits'].target)*self.node.net.SPREAD)*self.node.net.PARENT.DUST_THRESHOLD/block_subsidy)
                    )
        
        if True:
            share_info, gentx, other_transaction_hashes, get_share = share_type.generate_transaction(
                tracker=self.node.tracker,
                share_data=dict(
                    previous_share_hash=self.node.best_share_var.value,
                    coinbase=(script.create_push_script([
                        self.current_work.value['height'],
                        ] + ([mm_data] if mm_data else []) + [
                    ]) + self.current_work.value['coinbaseflags'])[:100],
                    nonce=random.randrange(2**32),
                    pubkey_hash=pubkey_hash,
                    subsidy=self.current_work.value['subsidy'],
                    donation=math.perfect_round(65535*self.donation_percentage/100),
                    stale_info=(lambda (orphans, doas), total, (orphans_recorded_in_chain, doas_recorded_in_chain):
                        'orphan' if orphans > orphans_recorded_in_chain else
                        'doa' if doas > doas_recorded_in_chain else
                        None
                    )(*self.get_stale_counts()),
                    desired_version=(share_type.SUCCESSOR if share_type.SUCCESSOR is not None else share_type).VOTING_VERSION,
                ),
                block_target=self.current_work.value['bits'].target,
                desired_timestamp=int(time.time() + 0.5),
                desired_target=desired_share_target,
                ref_merkle_link=dict(branch=[], index=0),
                desired_other_transaction_hashes_and_fees=zip(tx_hashes, self.current_work.value['transaction_fees']),
                net=self.node.net,
                known_txs=tx_map,
                base_subsidy=self.node.net.PARENT.SUBSIDY_FUNC(self.current_work.value['height']),
            )
        
        packed_gentx = bitcoin_data.tx_type.pack(gentx)
        other_transactions = [tx_map[tx_hash] for tx_hash in other_transaction_hashes]
        
        mm_later = [(dict(aux_work, target=aux_work['target'] if aux_work['target'] != 'p2pool' else share_info['bits'].target), index, hashes) for aux_work, index, hashes in mm_later]
        
        if desired_pseudoshare_target is None:
            target = bitcoin_data.difficulty_to_target_alt(self.min_difficulty, self.node.net.PARENT.DUMB_SCRYPT_DIFF)
            if self.share_rate is not None:
                if self.share_rate_type == 'address': # per-address
                    if local_addr_rates is not None:
                        local_rate = local_addr_rates.get(pubkey_hash, 0)
                    else:
                        local_rate = self.get_local_addr_rate(pubkey_hash)
                else: # per-miner
                    local_rate = self.get_miner_rate(user)
                if local_rate > 0:
                    target = min(target, bitcoin_data.average_attempts_to_target(local_rate * 60 / self.share_rate))
            else: # per-node
                local_hash_rate = self._estimate_local_hash_rate()
                if local_hash_rate is not None:
                    target = min(target,
                        bitcoin_data.average_attempts_to_target(local_hash_rate * 1)) # limit to 1 share response every second by modulating pseudoshare difficulty
            difficulty = bitcoin_data.target_to_difficulty_alt(target, self.node.net.PARENT.DUMB_SCRYPT_DIFF)
            rounded_difficulty = 1
            if difficulty >= 1:
                while (rounded_difficulty + rounded_difficulty * 2) / 2 < difficulty:
                    rounded_difficulty = rounded_difficulty * 2
            else:
                while (rounded_difficulty + rounded_difficulty / 2) / 2 >= difficulty:
                    rounded_difficulty = rounded_difficulty / 2
            target = bitcoin_data.difficulty_to_target_alt(rounded_difficulty, self.node.net.PARENT.DUMB_SCRYPT_DIFF)
        else:
            target = desired_pseudoshare_target
        target = max(target, share_info['bits'].target)
        for aux_work, index, hashes in mm_later:
            target = max(target, aux_work['target'])
        target = math.clip(target, self.node.net.PARENT.SANE_TARGET_RANGE)
        
        getwork_time = time.time()
        lp_count = self.new_work_event.times
        merkle_link = bitcoin_data.calculate_merkle_link([None] + other_transaction_hashes, 0)
        
        print 'New work for worker! Difficulty: %.06f Share difficulty: %.06f Total block value: %.6f %s including %i transactions' % (
            bitcoin_data.target_to_difficulty_alt(target, self.node.net.PARENT.DUMB_SCRYPT_DIFF),
            bitcoin_data.target_to_difficulty_alt(share_info['bits'].target, self.node.net.PARENT.DUMB_SCRYPT_DIFF),
            self.current_work.value['subsidy']*1e-8, self.node.net.PARENT.SYMBOL,
            len(self.current_work.value['transactions']),
        )

        #need this for stats
        self.last_work_shares.value[bitcoin_data.pubkey_hash_to_address(pubkey_hash, self.node.net.PARENT)]=share_info['bits']
        
        ba = dict(
            version=min(self.current_work.value['version'], 2),
            previous_block=self.current_work.value['previous_block'],
            merkle_link=merkle_link,
            coinb1=packed_gentx[:-self.COINBASE_NONCE_LENGTH-4],
            coinb2=packed_gentx[-4:],
            timestamp=self.current_work.value['time'],
            bits=self.current_work.value['bits'],
            share_target=target,
        )
        
        received_header_hashes = set()
        
        def got_response(header, user, coinbase_nonce):
            assert len(coinbase_nonce) == self.COINBASE_NONCE_LENGTH
            new_packed_gentx = packed_gentx[:-self.COINBASE_NONCE_LENGTH-4] + coinbase_nonce + packed_gentx[-4:] if coinbase_nonce != '\0'*self.COINBASE_NONCE_LENGTH else packed_gentx
            new_gentx = bitcoin_data.tx_type.unpack(new_packed_gentx) if coinbase_nonce != '\0'*self.COINBASE_NONCE_LENGTH else gentx
            
            header_hash = bitcoin_data.hash256(bitcoin_data.block_header_type.pack(header))
            pow_hash = self.node.net.PARENT.POW_FUNC(bitcoin_data.block_header_type.pack(header))
            try:
                if pow_hash <= header['bits'].target or p2pool.DEBUG:
                    helper.submit_block(dict(header=header, txs=[new_gentx] + other_transactions), False, self.node.factory, self.node.bitcoind, self.node.bitcoind_work, self.node.net)
                    if pow_hash <= header['bits'].target:
                        print
                        print 'GOT BLOCK FROM MINER! Passing to bitcoind! %s%064x' % (self.node.net.PARENT.BLOCK_EXPLORER_URL_PREFIX, header_hash)
                        print
            except:
                log.err(None, 'Error while processing potential block:')
            
            user, _, _, _ = self.get_user_details(user)
            assert header['previous_block'] == ba['previous_block']
            assert header['merkle_root'] == bitcoin_data.check_merkle_link(bitcoin_data.hash256(new_packed_gentx), merkle_link)
            assert header['bits'] == ba['bits']
            
            on_time = self.new_work_event.times == lp_count
            
            for aux_work, index, hashes in mm_later:
                try:
                    if pow_hash <= aux_work['target'] or p2pool.DEBUG:
                        df = deferral.retry('Error submitting merged block: (will retry)', 10, 10)(aux_work['merged_proxy'].rpc_getauxblock)(
                            pack.IntType(256, 'big').pack(aux_work['hash']).encode('hex'),
                            bitcoin_data.aux_pow_type.pack(dict(
                                merkle_tx=dict(
                                    tx=new_gentx,
                                    block_hash=header_hash,
                                    merkle_link=merkle_link,
                                ),
                                merkle_link=bitcoin_data.calculate_merkle_link(hashes, index),
                                parent_block_header=header,
                            )).encode('hex'),
                        )
                        @df.addCallback
                        def _(result, aux_work=aux_work):
                            if result != (pow_hash <= aux_work['target']):
                                print >>sys.stderr, 'Merged block submittal result: %s Expected: %s' % (result, pow_hash <= aux_work['target'])
                            else:
                                print 'Merged block submittal result: %s' % (result,)
                        @df.addErrback
                        def _(err):
                            log.err(err, 'Error submitting merged block:')
                except:
                    log.err(None, 'Error while processing merged mining POW:')
            
            if pow_hash <= share_info['bits'].target and header_hash not in received_header_hashes:
                last_txout_nonce = pack.IntType(8*self.COINBASE_NONCE_LENGTH).unpack(coinbase_nonce)
                share = get_share(header, last_txout_nonce)
                
                print 'GOT SHARE! %s %s prev %s age %.2fs%s' % (
                    user,
                    p2pool_data.format_hash(share.hash),
                    p2pool_data.format_hash(share.previous_hash),
                    time.time() - getwork_time,
                    ' DEAD ON ARRIVAL' if not on_time else '',
                )
                self.my_share_hashes.add(share.hash)
                if not on_time:
                    self.my_doa_share_hashes.add(share.hash)
                
                self.node.tracker.add(share)
                self.node.set_best_share()
                
                try:
                    if (pow_hash <= header['bits'].target or p2pool.DEBUG) and self.node.p2p_node is not None:
                        self.node.p2p_node.broadcast_share(share.hash)
                except:
                    log.err(None, 'Error forwarding block solution:')
                
                self.share_received.happened(bitcoin_data.target_to_average_attempts(share.target), not on_time, share.hash)
            
            if pow_hash > target:
                print 'Worker %s submitted share with hash > target:' % (user,)
                print '    Hash:   %56x' % (pow_hash,)
                print '    Target: %56x' % (target,)
            elif header_hash in received_header_hashes:
                print >>sys.stderr, 'Worker %s submitted share more than once!' % (user,)
            else:
                received_header_hashes.add(header_hash)
                
                self.pseudoshare_received.happened(bitcoin_data.target_to_average_attempts(target), not on_time, user)
                self.recent_shares_ts_work.append((time.time(), bitcoin_data.target_to_average_attempts(target)))
                while len(self.recent_shares_ts_work) > 50:
                    self.recent_shares_ts_work.pop(0)
                self.local_rate_monitor.add_datum(dict(work=bitcoin_data.target_to_average_attempts(target), dead=not on_time, user=user, share_target=share_info['bits'].target))
                self.local_addr_rate_monitor.add_datum(dict(work=bitcoin_data.target_to_average_attempts(target), pubkey_hash=pubkey_hash))
            
            return on_time
        
        return ba, got_response