LiquidApps Documentation
  • Introduction
  • 🧙‍♂️The DAPP Network
    • The DAPP Token
      • DAPP Token Overview
      • DAPP Tokens Tracks
      • Claiming DAPP Tokens
      • DAPP Tokens Distribution
      • Air-HODL
    • Cross Chain Bridges
    • Examples
      • Token bridge
      • Price Feed
      • Elemental Battles
      • LiquidChess
      • LiquidPortfolio
    • DAPP Network Resources
      • @liquidapps/dapp-client
        • vRAM
        • LiquidAccounts
        • DAPP Services
        • Air-Hodl
      • eosio-push-guarantee
      • Link Library
        • EOSIO Link
          • Tables
          • Crons
          • Macros
          • Variables
        • EVM Link - Solidity (Coming Soon)
  • ⚡Working with Zeus
    • Introduction
      • Requirements
      • Install Zeus and Unboxing
        • More on zeus-box.json
      • Get Started fast! (Zeus-IDE)
      • Docker CI/CD
      • Example Github Using Zeus
      • Getting started with AntelopeIO Contracts (formerly EOSIO)
    • Zeus Basics
      • Compiling Contracts
        • Clean CMake Files
      • Unit Testing
        • Printing Console
        • Fetching Table
        • Helper Functions
        • Example
      • Create ...
        • Contract/Unit Test
          • All DAPP Network Services
        • DSP Service
        • Contract Deployment
      • Import/Export Keys
      • Migrate Contract
      • Start local environment
        • Kill Services
      • Upgrade
      • Zeus RC File
      • Zeus Config File
    • Zeus Box Basics
      • Zeus Boxes Directory
        • Services
          • Oracles
        • Sample Boxes
        • Other Boxes
          • DAPP Network
          • SDKs
            • ETH-SDK
            • EOS SDK
          • Frontends
          • Extensions
          • Tests
          • Seeds
          • Microservices
          • Meta Boxes
          • Libraries
          • Game
          • EOS Framework
          • Economics
          • Templates
      • Add/Remove
      • Deploy
      • List Boxes
  • ⚙️DAPP Network Services
    • DAPP Network Services
      • vRAM
        • Getting Started Guide
          • Compile and Deploy
          • Staking for services
          • Test
          • Basic implementation
        • Smart Contract Macros
          • dapp::multi_index
        • Tools
          • DAPP Client Integration
            • get_vram_row
          • Zeus Commands
          • Scripts
            • Get table
            • Get ordered keys
        • Additional Features
          • Save load and reset dapp::multi_index data
          • Advanced Features
      • LiquidAccounts
        • Getting Started Guide
          • Compile and Deploy
          • Staking for services
          • Test
            • DAPP Client
          • Basic Implementation
          • DAPP Account
        • Smart Contract Macros
          • payload
          • VACCOUNTS_APPLY
          • require_vaccount
          • VACCOUNTS_DELAYED_CLEANUP
        • Tools
          • DAPP Client Integration
            • push_liquid_account_transaction
          • Zeus Commands
            • Zeus vaccounts push-action
          • Scripts
            • Deserialize Payload
        • Use between contracts
        • Use Between Chains
      • LiquidHarmony
        • Getting Started Guide
          • Compile and Deploy
          • Staking for services
          • Test
          • Basic Implementation
          • API DSP Key Storage
        • Smart Contract Macros
          • geturi
          • ORACLE_HOOK_FILTER
        • Creating an Oracle Request
          • HTTP/HTTPS GET/POST JSON
            • HTTP/HTTPS GET
            • HTTP/HTTPS GET JSON
            • HTTP/HTTPS POST
            • HTTP/HTTPS POST JSON
          • ECHO GET/POST JSON
            • ECHO GET
            • ECHO GET JSON
            • ECHO POST
            • ECHO POST JSON
          • Nodeos History Get
          • Sister Chain Fetch
            • sister_chain_block
            • sister_chain_history
            • sister_chain_info
            • sister_chain_last_irreversible
            • sister_chain_table_row
          • Foreign Chain Fetch
            • ethereum
              • endpoints
              • block_number
              • history
              • balance
              • storage
            • tron
              • endpoints
              • balance
              • block_number
              • block
              • transactions
              • transaction
            • cardano
              • endpoints
              • blocks
              • history
              • state
            • ripple
              • endpoints
              • balance
              • ledger
              • transactions
            • bitcoin
              • endpoints
              • balance
              • block
              • history
              • transaction
            • litecoin
              • endpoints
              • balance
              • block
              • history
              • transaction
            • bitcoin cash
              • endpoints
              • balance
              • block
              • history
              • transaction
          • Wolfram Alpha
          • Random Number
          • Stockfish
          • SQL
        • Additional Features
          • Pre geturi hook
          • Don't spend CPU condition
      • LiquidScheduler
        • Getting Started Guide
          • Compile and Deploy
          • Staking for Services
          • Basic Implementation
        • Smart Contract Macros
          • schedule_timer
          • remove_timer
          • timer_callback
          • start_interval
          • remove_interval
        • Additional Features
          • Don't spend CPU condition
      • LiquidStorage
        • Getting Started Guide
          • Compile and Deploy
          • Staking for Services
          • Test
          • Basic Implementation
        • Tools
          • Zeus Commands
            • zeus storage upload
            • zeus storage unpin
          • DAPP Client Integration
            • get_uri
            • unpin_public_file
            • upload_archive_to_liquidstorage
            • upload_file_to_liquidstorage
            • upload_public_file_from_vaccount
        • Example GET Static Web Page
      • LiquidLink
        • Getting Started Guide
          • Compile and Deploy
          • Staking for services
          • Test
          • Basic Implementation
        • Smart Contract Macros
          • svc_sign_signtrx
      • LiquidAuth
        • Getting Started Guide
          • Compile and Deploy
          • Staking for services
          • Test
          • Basic Implementation
        • Tools
          • DAPP Client Integration
            • invokeAuthedCall
      • DAPP Service Macros
        • CONTRACT_START
        • CONTRACT_END
        • DAPPSERVICES_ACTIONS
        • DAPPSERVICE_ACTIONS_COMMANDS
      • Additional Services
      • Smart Contract Console Log Syntax
      • Using on_notify with services
    • Packages and Staking
  • 👨‍🚀DAPP Service Providers
    • Introduction to DAPP Service Providers
    • DSPs
      • Architecture Overview
      • Setup DSP
        • Blockchain Account
        • EOSIO Node
          • Firehose Setup
        • IPFS
          • Adding peers
            • Reconnecting Peers Periodically
          • Bootsrapping from an existing IPFS Cluster
          • Running a private network
        • PostgreSQL Database Backend
          • How to wipe local database
        • Ethereum Virtual Machine Node Setup
        • DSP Node
          • Logs
            • Monitor all logs script
        • Register Package
          • Modify Package metadata
          • Enable/Disable Package
          • Update cost per action in QUOTA
          • More on Packages
          • Whitelist Stakers
        • Test Setup
        • Known attack vectors
      • DSP Maintenance
        • Upgrade DSP Node
        • Claim Rewards
        • Replay Contract
        • Cleanup IPFS and Oracle Entries
        • Consumer Pays CPU Permissions
      • DSP API Endpoints
        • Event
        • Version
        • vRAM
        • LiquidLink
        • LiquidStorage
        • LiquidAccounts
  • 👨‍💻DAPP NETWORK LABS
    • Introduction
    • DAPP Workers
    • EdgeDSPs
    • EdgeOS
  • 🌉CROSS CHAIN BRIDGES
    • Getting Started with LiquidBridge
      • EOSIO.token <> EOSIO.token Fungible Tokens
      • EOSIO.token <> ERC20 Fungible Tokens
        • EOSIO Side Setup
        • EVM Side Setup
          • Setup EVM Contracts
            • Setup EVM Token Contract
              • Initialize Token and Transfer Ownership
            • Setup EVM Tokenpeg Contract
            • Verify and Publish Source Code
              • token contract and overview
              • tokenpeg contract
        • Initialize EOSIO Side
        • Test bridge
      • EOSIO <> EOSIO Atomic Assets Non-Fungible Tokens
      • EOSIO Atomic Assets <> ERC721 Non-Fungible Tokens
        • EOSIO Side Setup
        • EVM Side Setup
          • Setup EVM ERC721 Contract
          • Setup EVM Atomictokenpeg Contract
          • Transfer Ownership
          • Verify Source Code
        • Initialize EOSIO Side
        • Test bridge
      • EOSIO Atomic Assets <> ERC1155 Non-Fungible Tokens
        • EOSIO Side Setup
        • EVM Side Setup
          • Setup Proxy Contract
          • Setup EVM ERC1155 Contract
          • Setup EVM ERC1155 Tradeable Contract
          • Transfer Ownership of ERC1155 contract to atomictokenpeg1155 contract
        • Initialize EOSIO Side
        • Test bridge
  • ⛓️LiquidX Stake Across Chains
    • Getting Started with LiquidX
      • Use DAPP Network Services
        • Smart Contract Steps
        • Add DSP on New Chain
        • Map Mainnet to New Chain
        • Map New Chain to Mainnet
      • Become a DSP on another chain
        • Editing config.toml file
        • Push DSP account mapping action
      • Example Chains to Add
        • CoVax
        • WAX
        • WAX Test
        • Telos
        • Telos Test
        • BOS
      • Add a Chain to LiquidX
        • Create accounts and set dappservicex contract
        • Register chain
  • 😷COVAX
    • Getting Started with CoVax Chain
      • Become a DAPP Service Provider
      • Become a Block Producer
  • 🗂️Blockchain Guides
    • Testnet Creation Guides
      • Create Binance Smart Chain Testnet Account
        • Add Binance Smart Chain Testnet Network to Metamask
        • Create EVM keypair
        • Get faucet funds
      • Create WAX Testnet Account
      • Creating Jungle 3 account
      • Create Mumbai Testnet Account (Matic-Polygon)
        • Get faucet funds
      • Creating CryptoKylin Account
      • Create Rinkeby Testnet Account
        • Change Metamask network to Rinkeby
        • Get faucet funds
    • Governance Guides
      • How to submit a proposal
      • How the Proposal System Works
      • Governance Rewards
      • How to Propose an MSIG
      • Update dappservices contract by msig
      • Setup MSIG Telegram Bot
      • Governance Contracts
      • Governance Frontend
      • Propose Payment by Msig
  • 🗒️Release Notes
    • Latest
    • History
      • 2.0.8191
      • 2.0.7966
      • 2.0.7931
      • 2.1.7848
      • 2.0.7735
      • 2.0.7661
      • 2.0.7644
      • 2.0.7622
      • 2.1.7420
      • 2.1.7301
      • 2.1.7111
      • 2.0.6808
      • 2.0.5328
      • 2.0.4719
      • 2.0.4002
      • 2.0.3107
      • 2.0.2812
      • 2.0.2527
  • 🙋‍♀️FAQs
    • Frequently Asked Questions The DAPP Token
    • Frequently Asked Questions DAPP Service Providers (DSPs)
    • Frequently Asked Questions vRAM
Powered by GitBook
On this page
  • Token bridge example
  • Download and test with zeus
  • Token bridge settings/initialization
  • Token bridge actions

Was this helpful?

  1. The DAPP Network
  2. Examples

Token bridge

PreviousExamplesNextPrice Feed

Last updated 4 years ago

Was this helpful?

Token bridge example

The Token bridge example uses the cron, oracle and ipfs service to enable token pegging between eosio chains.

Code located

Download and test with zeus

To download and run the unit test for tokenpeg with zeus simply run:

mkdir bridge; cd bridge
# npm install -g @liquidapps/zeus-cmd
zeus box create
zeus unbox tokenpeg
zeus test -c

The unit test will deploy two “bridge contracts”, one on the “mainnet” and one on a sidechain, as well as two corresponding token contracts on each chain. It will then transfer a token from the mainnet to sidechain and back from the sidechain to the mainnet.

Token bridge settings/initialization

The following are required settings for initializing the bridge contracts to allow cross chain transfers. Note that the code for the bridge contracts are identical, the only differences being the settings/initialization values.

  • name sister_code - name of bridge contract on other chain

  • string sister_chain_name - identifier of sister chain. The DSP’s servicing the bridge contracts need to support these chains and have appropriate endpoints.

  • name token_contract - the name of the token contract which holds the balances

  • bool processing_enabled - flag to enable/disable message processing. Essentially disables outgoing tokens.

  • bool transfers_enabled - flag to enable/disable token transfers to the bridge contract. Essentially disables incoming tokens.

  • uint64_t last_irreversible_block_num - stores the last irreversible block number

  • bool can_issue - boolean as to whether or not the contract can issue tokens. False on the chain where the original token was created, true on the other.

  • uint64_t last_irreversible_block_num stores the last irreversible block number

  • uint64_t last_received_releases_id, uint64_t last_received_receipts_id,uint64_t last_confirmed_block_id,uint64_t last_received_transfer_block_id - counters for tracking the last received block of releases, receipts, confirmed block, and transfers

The example also allows an average or median consensus mechanism for calculating the most recent price.

Token bridge actions

[[eosio::action]] void init( name sister_code, string sister_chain_name, name token_contract, symbol token_symbol, bool processing_enabled, bool transfers_enabled, uint64_t last_irreversible_block_num, bool can_issue, uint64_t last_received_releases_id, uint64_t last_received_receipts_id, uint64_t last_confirmed_block_id, uint64_t last_received_transfer_block_id );

  • initializes settings and broadcasts cron requests

[[eosio::action]] void enable(bool processing_enabled, bool transfers_enabled);

  • enable/disable processing or transfers

🧙‍♂️
here