POA
English
English
  • Welcome to POA
  • Features
    • Known Validators
    • POADAO Consensus
    • Bridged Native Token
    • On-Chain Randomness
  • Use Cases
    • Scalability for BlockChain Games
    • Community-Based Currencies
    • Subsidized Transactions
    • Decentralized Finance (DeFi)
  • DApp Spotlights
    • Ethernal.World
  • Roadmap
  • For users
    • POA Tokens
      • POA Merger & STAKE Swap
      • POA - STAKE FAQs
      • POA Token Supply
      • POA & POA20 Exchanges
      • POA & POA20 on Binance
      • FAQ: POA20 General Questions
    • POA Token Use Cases
      • Utility Token
      • Currency Token
      • Collateral Token
      • Bridged Token
      • Staking Token
      • Stable Token
    • POA to POA20 Bridge
    • Accept POA20 Payments
      • Account Registration & Login (Merchant Setup)
      • Setup Merchant Account
      • Merchant Payment Method Setup
      • Making a Payment with POA20 (Customer Perspective)
    • Tutorials
      • Trading POA20 on DEX.AG
      • POA20 Token Swaps on 1inch.exchange
      • Getting Airdrops via Discord
    • Governance
      • Article: A Successful Year of On-Chain Governance
      • Governance Reports
        • April 2020 Report
        • December 2019 Report
      • Ballot Type, Lifecycle & Limits
    • ❌Nifty Wallet (Discontinued)
      • Getting Started
      • Import and Interact with Smart Contracts
      • Connect to a Hardware Wallet (Ledger & Trezor)
      • Connect to D'CENT Biometric Wallet
      • Connect to Pocket Decentralized Network
    • 3rd Party Wallets
      • Trust Wallet
      • MetaMask
    • POA Mania
      • News - Updates
      • Rules
      • POA Mania FAQs
      • Deposit & Withdraw
      • Winner Selection
      • Round Details
      • POA Mania vs PoolTogether
      • POA Mania on Trust Wallet
      • POA Mania Security Audit
      • POA Mania on MetaMask Mobile
    • Whitepaper
      • POADAO v1
        • Introduction
        • Proof of Authority
        • POA Network Functionality
        • Decentralized apps (DApps)
          • Initial ceremony DApp
          • Proof of Physical Address (PoPA) DApp
          • Proof of Bank Account DApp
          • Proof of Social Network DApp
          • Proof of Phone Number DApp
          • Governance DApp
        • Summary & Acknowledgements
        • References
        • Appendix A: Code Samples
          • Ballots manager
          • Validators manager
          • Deployment scripts for the mining node
  • For developers
    • Developer Resources
    • Getting Tokens For Tests
      • ERC20 Test Token Faucet
      • Sokol Testnet Faucet
    • Full Node Setup
      • Install OpenEthereum Client
      • Install Nethermind Client
    • DApp Deployment
    • TheGraph Data Indexing
    • On-Chain Random Numbers
      • RNG explainer (AuRa + RandomAura Contract)
      • Accessing a Random Seed with a Smart Contract
      • Randomness FAQs
    • API & SQL Access
    • Smart Contract Dashboard
    • Grants for Building on POA
  • For validators
    • Getting Started
      • Validator Resources
      • Becoming a Validator
    • Bootnode Setup
      • AWS Bootnode Setup
        • Prerequisites
        • Configure AWS
        • Download and Configure Playbook
        • Deploy
      • Non-AWS Bootnode Setup & Deployment
        • Local/Remote Machine System Requirements
        • Node Preparation
        • Configure node with Deployment Playbook
    • Validator Node Setup
      • Nethermind Upgrade
      • AWS VM for Validator Node Deployment
        • MoC: Master of Ceremony Key Exchange & Generation
        • Current Validators Vote in New Validators
        • Validator Node Setup Prerequisites
        • Configuring AWS
        • Download and Configure Playbook
        • Deployment
        • Upgrade Instance to a Larger Instance Type
      • Non-AWS Validator Node Setup
        • Local & Remote Machine System Requirements
        • Remote Machine Setup
        • Configure Node using Deployment Playbook
      • NetStats Dashboard
    • Hard Forks
      • Parity Upgrade Guide
      • POA Core
        • 2021-11-02 | #24090200
        • 2021-05-24 | #21364900
        • 2020-03-31 | #14350721
        • 2019-12-19 | #12598600
        • 2019-04-29 | #8582254
        • 2018-01-29 | # 772000
        • 2018-10-22 | #5329160
        • POA Core spec.json hard-fork update
      • Sokol
        • 2021-05-24 | #21050600
        • 2020-02-20 | #13391641
        • 2019-12-05 | #12095200
        • 2019-02-06 | #7026400
        • 2019-01-04 | #6464300
        • 2018-09-19 | #4622420
        • 2018-01-18 | #509355
        • 2018-01-08 | #362296
        • Sokol spec.json hard-fork update
    • Validator DApps
      • Validators MetaData DApp
      • Adding or Removing a Validator
  • Media
    • Social Media
    • Media Kit
    • Contact Us
Powered by GitBook
On this page

Was this helpful?

  1. For developers

On-Chain Random Numbers

PreviousTheGraph Data IndexingNextRNG explainer (AuRa + RandomAura Contract)

Last updated 4 years ago

Was this helpful?

We are introducing an on-chain RNG based on RANDAO. It may be leveraged by smart contract developers to introduce random numbers into their applications. Note that random numbers are limited to certain blocks in the current implementation. See below for more information.

The following article explains on-chain randomness functions and how they will be used when POSDAO is implemented. It includes concepts and an example, and is a good place to start.

Randomness Contract (RandomAuRa)

Block

Date

Contract

14350721

03/31/2020

0x67e90a54AeEA85f21949c645082FE95d77BC1E70

Block

Date

Contract

13391641

02/20/2020

0x8f2b78169B0970F11a762e56659Db52B59CBCf1B

The current implementation requires a chain running OpenEthereum AuRa consensus mechanism with version 2.7.2+. The Random Number generation contract was .

PRNG implementation explainer
How to access the random seed in a smart contract
Randomness FAQs
https://forum.poa.network/t/reliable-randomness-bringing-on-chain-entropy-to-the-xdai-stable-chain/3015
introduced in this PR