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Main Group

Creating a Main Group is mandatory before you can create an MPC Wallet. You may begin to use the MPC Wallet once the Main Group is successfully created. As best security practices and to ensure the utmost safety for your assets, it is a good idea to set up your Signing Group and Recovery Group as soon as you can, and back up all holder groups. You can create multiple Signing Groups to cater to your business requirements, but it is recommended to create only one Recovery Group.

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Create a Main Group

When creating the Main Group for your MPC vault, you have the option to choose either mobile co-signer or server co-signer. Make sure you understand the primary purposes and prerequisites of each co-signer type in the table below before proceeding further.
Co-Signer TypeMobile Co-SignerServer Co-Signer
Primary PurposesThe mobile co-signer is an organization member who uses Cobo Guard to securely sign transactions. Their TSS Node ID is generated by their Cobo Guard.
If you are using the WaaS 2.0 API to create a holder group, you can copy the TSS Node ID in your Cobo Guard by tapping > My Public Key > TSS Node ID > Copy TSS Node ID.
The server co-signer is a server node that utilizes the TSS Node package to automatically sign transactions. Its TSS Node ID is generated using the provided TSS Node software package and must be done before setting up the wallet. See Introduction to server co-signers for detailed information about server co-signers.
For high-frequency transactions, we recommend using a server co-signer for automated signing.
Prerequisite StepsYour chosen key share holders need to:
  1. Download Cobo Guard.
  2. Set up Cobo Guard as a multi-factor authentication (MFA) method of their Cobo Accounts.
  3. Be added to your organization as a member.
Your chosen key share holders need to provide you with their generated TSS Node ID.
After you’ve chosen a co-signer type and set up the prerequisites, follow the instructions below to create a Main Group. Note: Only the users who have been assigned the Operator user role in the organization can create a Main Group.
  1. Log in to Cobo Portal.
  2. Click > MPC Wallets.
  3. Select your vault and then click Create Main Group under the vault name.
  1. On the Create Main Group dialog, navigate to the Key Share Holder 2 section, and then complete the following configurations:
    • To use Mobile Co-Signer, select a Holder (the TSS Node ID will be filled in automatically). The holder can be any user from your organization, regardless of their user role. Then click Confirm.
    • To use Server Co-Signer, enter a Holder name, fill in the TSS Node ID generated using the TSS Node software package, then click Confirm. See Introduction to server co-signers for detailed information about server co-signers.
  2. Inform the relevant key share holder to confirm on their end.
    • Notes:
      • If using mobile co-signer, the selected key share holder should use their Cobo Guard to generate the key share. For more details, refer to Generate key shares.
      • If using server co-signer, ensure to bring the TSS Node online within 24 hours. The confirmation process is completed as soon as the TSS Node goes online.
  3. Once the key generation process is completed in step 5, the Group Status will show as Active.
    You might need to refresh the Cobo Portal page to see the updated result.
    A default wallet will be automatically created for this vault upon successful key generation.
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