proof-of-kill

proof-of-kill

Individual-friendliness and low-power-consumption are rarely achieved at the same time in blockchain systems nowadays. In this implementation I try to resolve this issues by creating a new type of consensus model named "PoK(Proof of Kill)", which uses a game-like frontend(to be called "Agent") instead of CPU power to hold a race between nodes with safety guaranteed.

testing program：

This demo only supports mac/linux currently, install golang properly on the mentioned OS's for running this program: https://golang.org/doc/install

Build

 go build -o app

Prepare Multiple Terminals

You want to simulate multiple nodes of a P2P network by opening up several terminal windows. If you are using VScode, this goal can be easily achieved by tapping Split Terminal button in the upper right-hand corner of the default terminal window. I suggest an independent one though.

If nodes can't reach each other, turn off the firewall and retry.

Play with Configuration File

The key field in the configuration file is listen_port, a unique port stands for a unique node in our simulated P2P network.
You can leave other sections default. but don't set mine_difficulty_value lower than 10, otherwise you won't see any mining details show up in the log when it was done too fast.

 vim config.yaml

blockchain:
  # difficulty. don't make this lower than 10.
  mine_difficulty_value: 10
  # verifying bits upon PoK verification. higher bits bring higher security. but never make this value bigger than mine_difficulty_value
  verify_bit: 5
  # mining reward
  token_reward_num: 10
  # start mining when this number is reached
  trade_pool_length: 2
  # log directory
  log_path: "./"
  # directory for mnemonicwords
  chinese_mnemonic_path: "./chinese_mnemonic_world.txt"
network:
  # local monitoring IP
  listen_host: "127.0.0.1"
  # local monitoring port
  listen_port: "6666"
  # unique identifier of node group(nodes can only discover each other in the same group)
  rendezvous_string: "pok"
  # nodes only send data to the nodes with the same protocol id.
  protocol_id: "/chain/1.1.0"

Launch the Node, Hire an Agent

Launch Node 1

 ./app

Becasue you haven't hired any agents yet, you will be prompted to have one. Just follow the instructions.

Create Wallets, Generate the Genesis Block

Once you've got an agent, more commands are unlocked. Create 3 wallet addresses using command newwal.

-> newwal
Mnemonic Word： ["吴昆","黔鳄","板桥","键盘","小膜","潘总","拆股"]
Private Key  ： 44NwhHw15MSebrVyNmg6m5jm9hGKxmXgjVeZbb7p5z7S
Address      ： 1Dx8UpokXuv7Bvqa5ocgXKv8PKRLnvjdsd
-> newwal
Mnemonic Word： ["愈合","明月","计算","头型","专约","拒付","四创"]
Private Key  ： 3FZkWLFHNTGFd8MR2QikaN88nP6dmJeDRJkaM4XastN9
Address      ： 1KNgFa165mjG2dZLcZ2ifhKtaZLu3SR5iF
-> newwal
Mnemonic Word： ["几何","榆蘑","范明","顺诚","沉香","无畏","光露"]
Private Key  ： 4k6iSU5sANDqXZQmQLkt7dbzpJAMJzDrxPGxRVHuKqqh
Address      ： 1EVrFBakJnhaWAvHQNhCJKLzensYqtJxR5

Generate the Genesis Block, fund 1st address 100 coins

-> gen -a 1Dx8UpokXuv7Bvqa5ocgXKv8PKRLnvjdsd -v 100
Made Genesis Block.

Open up another terminal, Check out Node 1's log by command:(see mining process in detail.)

 tail -f log6666.txt 

Synchronize

Launch Node 2, Node 3 with #listen_port# in the config.yaml set up to 6667,6668.
Looking closer to Node 1's log you notice that other nodes will be detected as they joined the network. Node 2, Node 3 will synchronize local chain with Node 1 automatically once they get fully launched.

Making Transfer

Before transfer, you want to set up the address to receive mining reward, for each node.(if you don't set it, nodes won't receive any rewards)
Node 1:

-> setmineaddr -a 1Dx8UpokXuv7Bvqa5ocgXKv8PKRLnvjdsd
Receiving Mining Reward On Address [1Dx8UpokXuv7Bvqa5ocgXKv8PKRLnvjdsd].

Node 2:

-> setmineaddr -a 1KNgFa165mjG2dZLcZ2ifhKtaZLu3SR5iF
Receiving Mining Reward On Address [1KNgFa165mjG2dZLcZ2ifhKtaZLu3SR5iF].

Node 3:

-> setmineaddr -a 1EVrFBakJnhaWAvHQNhCJKLzensYqtJxR5
Receiving Mining Reward On Address [1EVrFBakJnhaWAvHQNhCJKLzensYqtJxR5].

Transfer 30 coins to each node from Node 1:

-> send -from ["1Dx8UpokXuv7Bvqa5ocgXKv8PKRLnvjdsd","1Dx8UpokXuv7Bvqa5ocgXKv8PKRLnvjdsd"] -to ["1KNgFa165mjG2dZLcZ2ifhKtaZLu3SR5iF","1EVrFBakJnhaWAvHQNhCJKLzensYqtJxR5"] -amount [30,30]
transaction has been broadcast.

Once your transaction gets broadcast to the network, nodes which received it start mining immediately, including yourself. But if any other nodes successfully mined the block with the same height as yours in the middle of your mining, your try will be aborted.

Checking Balance

Node 1 got 100 coins at the beginning, but after transferring 60 to Node 2 and 3, only 40 coins are left for Node 1 now.
Node 2 received 30 from Node 1.
Node 3 received 30 from Node 1 and mined the block. therefore Node 3 holds 30 + 10(reward) = 40 coins.

Node 1:
-> bal -a 1Dx8UpokXuv7Bvqa5ocgXKv8PKRLnvjdsd
Address: 1Dx8UpokXuv7Bvqa5ocgXKv8PKRLnvjdsd
Balance：40

Node 2:
-> bal -a 1KNgFa165mjG2dZLcZ2ifhKtaZLu3SR5iF
Address: 1KNgFa165mjG2dZLcZ2ifhKtaZLu3SR5iF
Balance：30

Node 3:
-> bal -a 1EVrFBakJnhaWAvHQNhCJKLzensYqtJxR5
Address: 1EVrFBakJnhaWAvHQNhCJKLzensYqtJxR5
Balance：40

You can do more transfer then checking balance on both of 3 nodes to make sure the chain is working properly.

Print Blockchain

Simply type cmd below to discover details about the current PoK chain.

-> chain