「Understanding Darwinia Bridge 1–5」A Hands-on Guide on How to Run a Bridger Node

This post was initially revealed on Darwinia

In a previous article, now we have launched our new design of a relayer payment market, which supplies customers with a brand new means of taking part to earn within the Darwinia ecosystem. As the discharge of Bridger is simply across the nook, we make a tutorial on tips on how to run your personal Bridger node to assist get you accustomed to the course of.

Relayers (aka. Bridgers) in Darwinia Community are offchain employee purchasers which relay the headers and messages between the supply chain and the goal chain. They’ve entry to each chains and switch knowledge in two instructions. Darwinia Bridger is an implementation of the relayer consumer written in Rust. Following are the steps of set up and configuration on a Substrate-to-Substrate bridger.

DISCLAIMER: There’s a risk that you just lose your property on account of many components. Do your analysis and take part at your personal danger. We strongly advise you to test-run on the Pangolin-Pangoro take a look at bridge earlier than going to the mainnet bridge.


Table of Contents

There are some talent necessities for operating a bridger node. If you’re Darwinia/Crab validator, you’ve already had the talent set. You should utilize the next guidelines as a reference.

  • Primary Linux/Unix instructions
  • Primary Docker operation
  • Ideas of personal keys, public keys and accounts in blockchains
  • In a position to signal and submit an extrinsic on Substrate-based blockchains


To efficiently run a bridger node, you’ll undergo many steps. We current an enormous image right here with the rationale behind these steps on your reference. The detailed guide might be within the subsequent part.

A bridger connects to each the supply and goal chains and submits transactions/extrinsics to each networks, so that you want an account for every community. The personal keys to your accounts might be set within the configuration file.

The relayer might be rewarded for its work and punished(slashed) for failing to perform the duty. Due to this fact, the account holder ought to lock some collateral and enroll as a relayer on each chains, which will be executed by submitting an extrinsic(enrollAndLockCollateral) on each chains.

It’s good to run and keep a bridger node, both regionally or on a cloud machine, to have the ability to do the precise work. You may both construct your personal executable from the supply code or use the docker picture.

When operating your relayer node, you may select from totally different methods. Some methods rely upon the info of realtime transaction charges. It’s good to apply for entry tokens to request such knowledge from oracles.

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Making ready Accounts

We advocate the chrome extension Polkadot{.js} and the command line instrument subkey for the administration of your account. A detailed tutorial on this subject will be discovered on our documentation web site.

Let’s create a Substrate account from a 12-word mnemonic phrase in Polkadot{.js}. In the meantime write down the mnemonic phrase for the technology of the personal key in later steps. You should utilize an account for each networks or create one for every community. Right here we create totally different accounts for various networks.

Suppose now we have used Polkadot{.js} to create an account account1 with a mnemonic phrase mnp1 for the Pangolin community. Use the command line instrument subkey to acquire the corresponding personal key prvt1. A personal key(prvt1 and prvt2) is a 256-bit quantity with the format of “0x….”. The Secret seed half is what we name a personal key.

You may see the deal with to your account when connecting to the designated community. addr1 begins with ‘5’ and addr2 begins with ‘2’. You’ll need these addresses when making use of for take a look at tokens.

Making use of for Check Tokens & Subscan API Keys

  • PRING for Pangolin community

Confer with this text to use for 100 PRINGs from the faucet.

  • ORING for Pangoro community

E-mail your Pangoro deal with and motive to [email protected]

  • Subscan API Key for Transaction Value Oracle

Refer to fill out a Google kind to use for a free Subscan API key.

Enrolling by Locking Collateral

When you’ve created your account and obtained some tokens, you may go to the Substrate portal to hook up with the Pangolin community to enroll.

Observe the order on the screenshot under to enroll. It’s good to specify your personal values for lockCollateral and relayFee. The relayFee is the present minimal for relayFee is 15. The extra lockCollateral you lock, the extra orders you may take concurrently.

Submit the transaction by signing it, and also you turn out to be a legitimate(assigned) relayer on the Pangolin community.

Then swap to the Pangoro community and do precisely the identical to turn out to be an assigned relayer on the Pangoro community.

Set up

There are a number of methods to put in Bridger. You may obtain and set up a binary, construct from the supply code, or pull a Docker picture.

  • Obtain from GitHub releases

Obtain the binary from latest release. You can too discover the VERSION quantity there, which is a parameter within the following command traces.

Run the next command.

docker pull<VERSION>

NOTE: It’s best to exchange <VERSION> with the newest model quantity. It’s v0.4.8 as of the time the article is revealed.

$ git clone <>
$ cd bridger/
$ cargo construct --release

NOTE: Please use the final nightly toolchain. You may need to change the default toolchain utilizing rustup default nightly, some bridges want wasm assist, you may run rustup goal add wasm32-unknown-unknown.


The executable bridger might be within the folder goal/launch if the compilation completes efficiently. You might be free to maneuver the executable to an applicable path in your machine.

In accordance with the precise supply and goal chains, Darwinia Bridger will be configured to various kinds of relayers. Right here we are going to solely reveal the configuration for the Pangolin-Ropsten Bridger.

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Then create a folder for configuration recordsdata and knowledge storage, and duplicate the template file to the newly-created folder.

$ mkdir ~/.bridger
$ cp .keep/config/task-pangolin-ropsten.toml ~/.bridger/

Open and edit the file ‘task-pangolin-ropsten.toml’ to set the parameters. The Bridger is a piece in progress. Some parameters are for superior administration and a few are reserved for future extension. We solely cowl the minimal needed parameters right here. We advocate you to maintain the parameters as they’re within the template until specified right here.

  • Non-public key to the account on Pangolin (prvt1)

prvt1 has the format “0x…”

[Pangolin] … signer= prvt1

  • Non-public key to the account on Pangoro (prvt2)

prvt2 has the format “0x…”

[Pangoro] … signer= prvt2

[task]# 1800 seconds, half-hour 
interval_update_fee = 1800
update_fee_strategy = "Nothing"

The default technique is Nothing which suggests your worth provide is what you set once you enroll. There are different two predefined methods accessible, Loopy and Affordable.

Below the Loopy mode, you’ll provide a worth of 1 token lower than the present lowest worth.

Below the Affordable mode, you replace your provide based mostly on the real-time costs and the change ratio between tokens on each chains. Such knowledge will be obtained from third-party oracles. If you want to question such knowledge from Subscan, it is best to apply for an API key and set as follows.

In case you selected the Affordable technique, uncomment the Subcan part and use the API key as token. The Subscan API key’s a hex quantity embraced by a pair of citation marks, like “07acae5ae7a467e091c05d8b840313d4”.

endpoint = ""
token = subscan_api_key
timeout = 30
[pangoro_subscan]endpoint = "" 
token = subscan_api_key
timeout = 30


After setting the parameters appropriately, you may proceed to begin a bridger. You may check out the assistance first.

$ bridger server --help
bridger-server 0.4.8
Begin bridger server
bridger server [OPTIONS]
--help Prints assist data
-V, --version Prints model data
--base-path <base-path> The bridger config or knowledge base path
-h, --host <host> Bridger service hear host [default:]-p, --port <port> Bridger service hear port [default: 1098]
  • -base-path All of bridger knowledge, equivalent to process config and database, might be saved right here. The default path is $HOME/.bridger
  • -host The host of the bridger server.
  • -port The port of the bridger server.
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Exchange the host and port within the following command with your personal to truly begin a bridger server.

$ bridger server --host --port 2021

If all the things goes properly, you will note one thing like that:


After getting familiarized your self with these operations by way of the take a look at bridger and absolutely perceive the attainable advantages and dangers of taking part within the relay payment market, you may turn out to be a relayer on the principle networks (Darwinia-to-Crab) and earn commissions, selecting your technique in keeping with your danger urge for food. To turn out to be a Darwinia-to-Crab bridger, you want to copy the template file task-darwinia-crab.toml to the bottom path and exchange the parameters accordingly. In fact, you need to ensure you have some RING in your Darwinia account and a few CRAB in your Crab account.

Collection Articles:

「Understanding Darwinia Bridge 1–1」Darwinia Relayer Incentive Scheme — Fee Market

「Understanding Darwinia Bridge 1–2」Mapping Token Factory

「Understanding Darwinia Bridge 1–3」The Token Bridge Solution

「Understanding Darwinia Bridge 1–4」The New Message Protocol for the Ethereum-Darwinia Bridge

About Darwinia Community

Darwinia Community is a decentralized cross-chain bridge community constructing on Substrate, which is the “cross-chain bridge hub” of the Internet 3.0 Metaverse. It supplies a secure and normal bridging answer, connects to Polkadot, Ethereum, TRON, and different heterogeneous chains by cross-chain switch of property and distant chain calls.

Darwinia Community has gained excessive status and recognition alongside the way in which to construct the decentralized cross-chain bridge protocol. In 2020, Darwinia was written in Polkadot light-paper as one of many buddies of Polkadot and Substrate. And Darwinia was chosen to affix Substrate Builder Program and Web3.0 Bootcamp, and for the excellent work in Substrate Builder Program, Darwinia Community was formally awarded the Stage 2 badge by Parity. The merchandise and instruments developed by Darwinia have been rewarded three W3F Grants.

Darwinia has been contributing to the compatibility and interoperability of the Metaverse.

The appliance areas of Darwinia Community embody DeFi, cross-chain NFT buying and selling, video games, and many others. Darwinia additionally develops the Metaverse recreation Evolution Land.

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