BIOS Contract


Bios.sol - is the main kernel smartcontract with all the logic about consensus, staking and voting. Its based on the QueueHelper that brings queue implementation code. Latest version of the Bios contact you can always find in our repo

BIOS Addresses

To track the current address of the Bios contract, there is a Versioner contract located at fixed address 0x0000000000000000000000000000000000000022. To query it for the Bios contract address, use bios public method. Here is an example in javascript:

const versionerAbi = [
    constant: true,
    inputs: [],
    name: 'bios',
    outputs: [{ name: '', type: 'address' }],
    payable: false,
    stateMutability: 'view',
    type: 'function'
const versionerAddress = '0x0000000000000000000000000000000000000022';
const versioner = new web3.eth.Contract(versionerAbi, versionerAddress);
const biosAddress = await versioner.methods.bios().call({ from: account });

Note that the resulting address may be zero, this means that the Bios contract is not yet installed.

BIOS Usages examples

Let’s take a look at the simple example of Javascript code that will get all authorities nodes from our BIOS contract.

  const { eth } = require('./web3relay');
  const ABI = require('../abi/bios');
  const { getConfig } = require('../utils');

  const config = getConfig();
  if (!config.biosAddress) throw new Error('Setup config.biosAddres');
  const contract = new eth.Contract(ABI, config.biosAddress);

  module.exports = function (req, res) {
    if (typeof contract.methods.getAuthorities !== 'function') {
      console.error('Contract method \'getAuthorities\' not found', err);
      .then(authorities => {
      .catch(err => {
        console.error('Can\'t get authorities from contract. Silently return empty array', err);

If you are interested to see more examples how to call BIOS contact API you could check our API documentation sections for example - Voting API