Bor is state chain in Matic architecture. It is a fork of Geth https://github.com/ethereum/go-ethereum with new consensus called Bor.

Source: https://github.com/maticnetwork/bor

Consensus

Bor uses new improved consensus, inspired by Clique consensus https://eips.ethereum.org/EIPS/eip-225

More details on consensus and specifications:

Bor Consensus

Genesis

The genesis block contains all the essential information to configure the network. It's basically the config file for Bor chain. To boot up Bor chain, the user needs to pass in the location of the file as a param.

Bor uses genesis.json as Genesis block and params. Here is an example for Bor genesis config

"config": {
    "chainId": 15001,
    "homesteadBlock": 1,
    "eip150Block": 0,
    "eip150Hash": "0x0000000000000000000000000000000000000000000000000000000000000000",
    "eip155Block": 0,
    "eip158Block": 0,
    "byzantiumBlock": 0,
    "constantinopleBlock": 0,
    "bor": {
      "period": 1,
      "producerDelay": 4,
      "sprint": 64,
      "validatorContract": "0x0000000000000000000000000000000000001000",
      "stateReceiverContract": "0x0000000000000000000000000000000000001001"
    }
  }

Config

Consensus specific config

EVM/Solidity as VM

Bor uses un-modified EVM as a VM for a transaction. Developers can deploy any contract they wish using the same Ethereum tools and compiler like solc without any changes.

Matic as Native token (Gas token)

Bor has a Matic token as a native token similar to ETH in Ethereum. It is often called the gas token. This token works correctly as to how ETH works currently on the Ethereum chain.