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- from clock import SynchedNTPClock
- from vrf import VRF
- import threading
- import time
- '''
- \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 genesis block.
- #TODO implement trustedbeacon as a node
- '''
- class TrustedBeacon(SynchedNTPClock, threading.Thread):
- def __init__(self, node, epoch_length):
- SynchedNTPClock.__init__(self.epoch_length)
- threading.Thread.__init__(self)
- self.daemon=True
- self.epoch_length=epoch_length # how many slots in a a block
- self.node = node #stakeholder
- self.vrf = VRF(self.node.vrf_pk, self.node.vrf_sk, self.node.vrk_base)
- self.current_slot = self.slot
- def run(self):
- self.__background()
- def __background(self):
- current_epoch = self.slot
- while True:
- if self.slot != current_epoch:
- current_epoch = self.slot
- self.__callback()
- def __callback(self):
- self.current_slot = self.slot
- sigma, proof = self.vrf.sign(self.current_slot)
- if self.slot%self.epoch_length==0:
- self.node.new_slot(self.current_slot, sigma, proof)
- else:
- self.node.new_slot(self.current_slot, sigma, proof, True)
- def verify(self, y, pi, pk_raw, g):
- return VRF.verify(self.current_slot, y, pi, pk_raw, g)
-
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