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Cross Domain Messaging (XDM)

Cross Domain Messaging on the Autonomys Network​

This guide explains what XDM is and walks you through how to transfer assets between consensus and domain chains.

Introducing Cross Domain Messaging (XDM)​

Cross Domain Messaging (XDM) is a core feature of the Autonomys Network that enables secure and seamless communication between independent blockchain domains, such as the consensus chain and specialized domains like Auto EVM. XDM allows these separate blockchains to exchange assets, messages, and data reliably, enhancing interoperability and collaboration across the entire Autonomys ecosystem.

If you want to learn more about the technical nuances of XDM you can find further details in our protocol specs.

XDM Confirmation and Timing​

To maintain security, there is a challenge period that has to expire when transferring tokens between domains and the consensus chain. Tokens are not fully available for use until the confirmation time has passed. Study the table below to understand confirmation blocks and rough timings:

SourceDestinationConfirmation BlocksConfirmation Time
ConsensusDomain100 consensus~10 minutes
Domain ADomain B14,400 domain~1 day
DomainConsensus14,400 domain~1 day

Refunds due to a failure to complete an XDM transfer will take 28,800 blocks in total​

As long as the XDM is confirmed on the source chain (100 consensus blocks or 14,400 domain blocks) the XDM is able to be relayed and executed (the transfer happens) on the destination chain.

The destination chain generates an XDM response that will be sent back to the source chain after the XDM response is confirmed on the destination chain (100 consensus blocks or 14,400 domain blocks), but the XDM response is mostly a no-op and only useful when the XDM is failed and it is necessary to refund the sender on the sender chain.

XDM Fees​

An XDM transaction is charged at 5x its standard weight since it is not possible to accurately predict the destination chain fee when submitting.

Executing XDM Transfers​

Consensus to Auto EVM domain with PolkadotJS​

You will need to navigate to the consensus domain in PolkadotJS by either selecting it in the network switcher or following this link: https://polkadot.js.org/apps/?rpc=wss%3A%2F%2Frpc.mainnet.autonomys.xyz%2Fws#/extrinsics

PolkadotJS must be linked to a wallet that has some AI3 tokens on the consensus chain. You can use SubWallet, Polkadot, or Talisman Wallet for this.

Tailsman Wallet

If transfers to Auto EVM are being made from Talisman Wallet, you may need to add a new network if you don't see your non-zero token balance. You can do this by clicking the more button in the bottom left of the wallet pop-up. Choose Manage Networks and then Add Network. You can then enter the following details:

Working from the top down:

  1. Select the account you want to XDM consensus tokens from.
  2. Select the transporter.transfer() extrinsic.
  3. Select Domain in the dstLocation chainId dropdown.
  4. Enter the domain you want to use in the Domain with 0 being the Auto EVM domain.
  5. Select AccountId20 in the AccountId dropdown.
  6. Enter the 0x EVM account address you want to send the tokens to on the Auto EVM domain.
  7. Enter the amount, which will be the number of tokens with 18 zeroes afterwards as the value is in Shannons.
  8. Submit Transaction.

PolkadotJS

Auto EVM domain to consensus with PolkadotJS​

You will need to navigate to the Auto EVM domain in PolkadotJS by either selecting it in the network switcher or following this link: https://polkadot.js.org/apps/?rpc=wss%3A%2F%2Fauto-evm.mainnet.autonomys.xyz%2Fws#/extrinsics

PolkadotJS must be linked to a wallet that has some AI3 tokens on the EVM domain chain. You can use either SubWallet or Talisman Wallet for this.

Working from the top down:

  1. Select the account you want to XDM from.
  2. Select the transporter.transfer() extrinsic.
  3. Select Consensus in the dstLocation chainId.
  4. Enter your Autonomys account address in the AccountId32 textbox.
  5. Enter the amount, which will be the number of tokens with 18 zeroes afterwards as the value is in Shannons.
  6. Submit Transaction.

PolkadotJS

Automated XDM​

It is possible to use the Auto SDK’s @autonomys/auto-xdm package to submit these transactions if you’d like to automate them in some way.