[research/dpos] reverted from pvss to vrf

script/research/dpos/ouroboros/beacon.py

@@ -6,11 +6,9 @@ from ouroboros.logger import Logger
 '''
 \class TrustedBeacon
 
-the trusted beacon is decentralized, such that at the onset of the Epoch,
-the leader of the first slot generated the signed seed, and release the signature, 
-proof, and base to the ge nesis block.
-
-#TODO implement trustedbeacon as a node
+leaky, non-resettable beacon, leaky in the sense that the slots are 
+predictable, and non-resettable, beacon is basically a synchronized 
+timestamp.
 '''
 class TrustedBeacon(SynchedNTPClock, threading.Thread):
 
@@ -42,7 +40,3 @@ class TrustedBeacon(SynchedNTPClock, threading.Thread):
             y, pi = vrf.sign(slot_idx)
             rands[slot_idx] = (y,pi)
         return rands
-    '''
-    def verify(self, y, pi, pk_raw, g):
-        return VRF.verify(self.current_slot, y, pi, pk_raw, g)
-    '''

script/research/dpos/ouroboros/block.py

@@ -25,17 +25,27 @@ class Block(object):
             self.state=state_hash(previous_block)
         self.tx = data
         self.sl = slot_uid
+        self.signature = None # block issuer signature
+        self.sigma = None #  proof that the block is valid.
         self.is_genesis=genesis
         self.endorsed=False
         self.log = Logger(genesis_time)
         self.leader_id=None
         self.endorser_id=None
 
+    @property
+    def slot(self):
+        return self.sl
+    
     def __repr__(self):
         if self.is_genesis:
-            return "GensisBlock at {slot:"+str(self.sl)+",data:"+str(self.tx)+",state:"+str(self.state)+"}\n"+str(self.tx)
-        return "Block at {slot:"+str(self.sl)+",data:"+str(self.tx)+",state:"+str(self.state)+"}"
+            return "GensisBlock " + str(self.__to_dict)
+        return "Block " + str(self.__to_dict)
     
+    @property
+    def __to_dict(self):
+        return  {SLOT: self.st, STATE: self.state, DATA: self.tx, PROOF: self.sigma, SIGN: self.signature}
+
     def __hash__(self):
         if type(self.tx)==str:
             return hash((self.state, self.tx, self.sl))
@@ -50,9 +60,7 @@ class Block(object):
             self.sl == block.sl
 
     def to_json(self):
-        d = {'state':self.state, \
-            'data': self.tx, \
-            'sl': self.sl}
+        d = self.__to_dict
         return json.encoder(d)
 
     def set_endorsed(self):
@@ -65,6 +73,12 @@ class Block(object):
     def set_leader(self, id):
         self.leader_id=id
     
+    def set_sigma(self, sigma):
+        self.sigma = sigma
+    
+    def set_signature(self, sign):
+        self.signature = sign
+
     @property
     def data(self):
         return self.tx
@@ -78,7 +92,7 @@ class Block(object):
         return (self.tx=='' or self.slot<0) and self.state==''
 
     def encode(self):
-        return str(self).encode()
+        return str(self.__to_dict).encode()
 
 class GensisBlock(Block):
     '''

script/research/dpos/ouroboros/clock.py

@@ -8,7 +8,7 @@ import math
 
 class SynchedNTPClock(object):
 
-    def __init__(self, epoch_length, slot_length=180, ntp_server='europe.pool.ntp.org'):
+    def __init__(self, epoch_length, slot_length=60, ntp_server='europe.pool.ntp.org'):
         #TODO how long should be the slot length
         self.epoch_length=epoch_length # how many slots in a a block
         self.slot_length=slot_length

script/research/dpos/ouroboros/consts.py

@@ -1,4 +1,16 @@
 STAKEHOLDERS_DISTRIBUTIONS='distributions'
 STAKEHOLDERS='stakeholders'
 SEED='seed'
-TX='tx'
+TX='tx'
+
+# block keys
+'''
+the block in praos is consistent of the following
+(sl, st,d, B_pi, sigma)
+'''
+SLOT = "SLOT" # sl
+STATE = "STATE" #st
+DATA = "DATA" #d
+PROOF = "PROOF" #B_pi
+SIGN = "SIGNATURE" #sigma
+

script/research/dpos/ouroboros/environment.py

@@ -17,7 +17,7 @@ from ouroboros.stakeholder import Stakeholder
 environment is ought to interfece with the network
 '''
 class Z(object):
-    def __init__(self, stakeholdes,  epoch_length, genesis_time=time.time()):
+    def __init__(self, stakeholdes,  epoch_length, genesis_time=time.time(), f=0.1):
         self.genesis_time=genesis_time
         self.beacon = TrustedBeacon(epoch_length, genesis_time)
         self.log = Logger(self, genesis_time)
@@ -41,8 +41,19 @@ class Z(object):
         self.prev_leader_id=-1
         #
         self.current_block=None
+        self.f = f
         self.init()
 
+    '''
+    active slot coefficient  determine the relation between,
+    probability of leader being selected, and the relative stake,
+    it's defined as the probability that a party holding all the stake
+    will be selected to be a leader for given slot.
+    '''
+    @property
+    def slot_coef(self):
+        return self.f
+
 
     def init(self):
         for sh in self.stakeholders:
@@ -51,9 +62,10 @@ class Z(object):
         #pick initial leader to be the first stakeholder
         initial_leader = self.stakeholders[0]
         #pick initial endorser to be the first endorser
-        initial_endorser = self.stakeholders[1]
+        #initial_endorser = self.stakeholders[1]
         self.current_epoch = self.beacon.epoch
         self.rands = self.beacon.next_epoch_seeds(initial_leader.vrf)
+        self.log.info(f"rands length: {len(self.rands)}")
         self.current_slot = self.beacon.slot
         self.select_epoch_leaders()
         self.prev_leader_id=0
@@ -116,9 +128,15 @@ class Z(object):
 
 
     def __repr__(self):
-        buff= f"envirnment of {self.length} stakholders\tcurrent leader's id: {self.current_leader_id}\tepoch_slot: {self.epoch_slot}\tendorser_id: {self.current_endorser_id}"
-        for sh in self.stakeholders:
-            buff+=str(sh)+"\n"
+        buff = ''
+        if len (self.slot_committee)>0:
+            buff = f"envirnment of {self.length} stakholders\tcurrent leader's id: \
+                {self.current_leader_id}\tepoch_slot: {self.epoch_slot}\tendorser_id: \
+                     {self.current_endorser_id}"
+            for sh in self.stakeholders:
+                buff+=str(sh)+"\n"
+        else: 
+            buff =  f"envirnment of {self.length} stakholders\tepoch_slot: {self.epoch_slot}"
         return buff
    
     '''
@@ -163,7 +181,7 @@ class Z(object):
 
     @property
     def current_leader_id(self):
-        return self.slot_committee[self.current_slot][0]
+        return self.slot_committee[self.epoch_slot][0]
 
     @property
     def current_stakeholder(self):
@@ -172,7 +190,7 @@ class Z(object):
 
     @property
     def current_endorser_id(self):
-        return self.slot_committee[self.current_slot][1]
+        return self.slot_committee[self.epoch_slot][1]
 
     @property
     def current_endorser_uid(self):
@@ -197,7 +215,7 @@ class Z(object):
         return self.endorser(slot).vrf_pk
 
     def is_current_endorser(self, id):
-        _, edr_idx = self.slot_committee[self.beacon.slot]
+        _, edr_idx = self.slot_committee[self.epoch_slot]
         return id == self.stakeholders[edr_idx].id
 
     @property
@@ -209,7 +227,7 @@ class Z(object):
         return self.stakeholders[self.current_leader_id].vrf_base
 
     def is_current_leader(self, id):
-        ldr_idx, _ = self.slot_committee[self.beacon.current_slot]
+        ldr_idx, _ = self.slot_committee[self.epoch_slot]
         return id == self.stakeholders[ldr_idx].id
 
     
@@ -230,8 +248,6 @@ class Z(object):
     def current_leader_sig_pk(self):
         return self.stakeholders[self.current_leader_id].sig_pk
     
-
-
     #note! assumes epoch_slot lays in the current epoch
     def leader(self, slot):
         return self.stakeholders[self.slot_committee[slot][0]]
@@ -301,11 +317,14 @@ class Z(object):
         return self.beacon.epoch
 
     def select_epoch_leaders(self):
+        self.log.info("[Z/select_epoch_leaders]")
         #assert len(self.sigmas)==self.epoch_length and len(self.proofs)==self.epoch_length, \
             #self.log.error(f"size mismatch between sigmas: {len(self.sigmas)}, proofs: {len(self.proofs)}, and epoch_length: {self.epoch_length}")
         for i in range(self.epoch_length):
-            #self.log.info(f"current sigma of index {i} , epoch_length: {self.epoch_length}")
+            self.log.info(f"current sigma of index {i} , epoch_length: {self.epoch_length}, rand : {self.rands}")
             slot_idx = self.current_slot + i
+            assert len(self.rands)>0
+            slot_idx_relative = slot_idx%self.epoch_length
             sigma, _ = self.rands[slot_idx]
             assert sigma!=None, 'proof cant be None'
             def leader_selection_hash(sigma):
@@ -324,11 +343,11 @@ class Z(object):
             # under a single condition that no one is able to predict who is next
             assert not leader_idx==endorser_idx
             #TODO move leader/endorser to a dictionary
-            self.slot_committee[slot_idx] = (leader_idx, endorser_idx)
+            self.slot_committee[slot_idx_relative] = (leader_idx, endorser_idx)
             self.log.highlight(f'slot {slot_idx} has committee leader/endorser {leader_idx}/{endorser_idx}\nleader: {self.stakeholders[leader_idx]}\nendorser: {self.stakeholders[endorser_idx]}')
         self.epoch_initialized[str(self.epoch)] = True
 
-    def broadcast_block(self, cur_block, signed_block, slot_uid):
+    def broadcast_block(self, cur_block):
         while self.current_blk_endorser_sig is None:
             self.log.info('pending endorsing...')
             time.sleep(1)
@@ -337,11 +356,10 @@ class Z(object):
         self.current_block = cur_block
         for stakeholder in self.stakeholders:
             if not stakeholder.is_leader:
-                stakeholder.receive_block(signed_block, self.current_blk_endorser_sig, slot_uid)
+                stakeholder.receive_block(cur_block, self.current_blk_endorser_sig)
+                #stakeholder.receive_block(cur_block.signature, self.current_blk_endorser_sig, cur_block.slot)
         self.print_blockchain()
 
-
-
     @property
     def block_id(self):
         return self.current_slot%self.epoch_length

script/research/dpos/ouroboros/stakeholder.py

@@ -1,5 +1,6 @@
 from copy import deepcopy
 import time
+import numpy as np
 from ouroboros.block import Block, GensisBlock, EmptyBlock
 from ouroboros.blockchain import Blockchain
 from ouroboros.epoch import Epoch
@@ -9,6 +10,7 @@ from ouroboros.logger import Logger
 from ouroboros.consts import *
 from ouroboros.data import Data, Transaction, Item
 
+
 '''
 \class Stakeholder
 '''
@@ -53,7 +55,21 @@ class Stakeholder(object):
     @property
     def vrf_base(self):
         return self.__vrf_base
+
+    @property
+    def probability_leader_election(self):
+        return 1 - np.pow(1 - self.env.slot_coef, self.stake)
     
+    '''
+    true random oracle from the blockchain
+    it's simulate by a hash function that is modeled as a random oracle. This hash function
+    is applied to the concatenation of VRF values that are inserted into each block, using values from
+    all blocks up to and including the middle ~ 8k slots of an epoch that lasts approximately 24k slots
+    in entirety
+    '''
+    def random_oracle(self):
+        pass
+
     def __repr__(self):
         buff=''
         if self.env.is_current_leader(self.id):
@@ -154,7 +170,8 @@ class Stakeholder(object):
             self.current_block = EmptyBlock(self.env.genesis_time)
         '''
         signed_block = sign_message(self.passwd, self.sig_sk, self.current_block)
-        self.env.broadcast_block(self.current_block, signed_block, self.current_slot_uid)
+        self.current_block.set_signature(signed_block)
+        self.env.broadcast_block(self.current_block)
     
     @property
     def current_slot(self):
@@ -198,14 +215,14 @@ class Stakeholder(object):
             time.sleep(1)
         return cur_blk, stashed
 
-    def receive_block(self, signed_block, endorser_sig, blk_uid):
+    def receive_block(self, blk, endorser_sig):
         self.log.highlight("receiving block")
-        cur_blk, stashed = self.__get_blk(blk_uid)
+        cur_blk, stashed = self.__get_blk(blk.slot)
         #TODO to consider deley should retrive leader_pk of corresponding blk_uid
         self.log.highlight(f'receiving block  {str(cur_blk)}')
         self.log.highlight(f'receiving block has slot_uid: {self.current_slot_uid}')
         self.log.highlight(f'receiving block has sig_pk: {self.env.current_endorser_sig_pk}')
-        blk_verified = verify_signature(self.env.current_leader_sig_pk, cur_blk, signed_block)
+        blk_verified = verify_signature(self.env.current_leader_sig_pk, cur_blk, blk.signature)
         self.log.info("endorser sig_pk {self.env.current_endorser_sig_pk}, cur_blk: {cur_blk}, endorser_sig: {endorser_sig}")
         blk_edrs_verified = verify_signature(self.env.current_endorser_sig_pk, cur_blk, endorser_sig)
         if blk_verified and blk_edrs_verified:

script/research/streamlet_rust/.gitignore

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