Add TSS Node

Only clients who have been granted the “admin” role can add TSS Node(s) on Cobo Custody Web. To do so, please click on “MPC TSS Node” under “Settings.”

You (i.e. the admin) can manually add the Node ID of a selected TSS Node on Cobo Custody Web. Please note that an authorization on Cobo Auth is required.

Once all TSS Nodes have been added on Cobo Custody Web, the key generation process will automatically start. This process requires all TSS Nodes to be online in order to jointly generate a set of 3 MPC key shares in an independent manner. The MPC root extended public key will also be created. All wallet addresses under the MPC wallet can be derived using this root extended public key via BIP32.

If the MPC key share managed by you or your entrusted third party is lost, corrupted or compromised, a new set of MPC key shares must be generated using the other two MPC key shares that are still intact.

If the MPC key share managed by you (i.e. the client) is no longer accessible, the recovery process is referred to as soft key recovery. if the MPC key share managed by your entrusted third party is no longer accessible, the recovery process is referred to as third party key recovery. For more information, please refer to the "Disaster Recovery” section in "MPC Key Share User Guide." Note that the MPC root extended public key and wallet/asset information will remain the same.

The party whose MPC key share is no longer accessible must initialize a new TSS Node first. In addition, soft key recovery and third party key recovery require all three parties to be online (i.e. you, your entrusted third party, and Cobo). Once both prerequisites are met, you can head to "MPC TSS Node" on Cobo Custody Web.

You can click on the “Change” button next to the TSS Node that needs to be updated. For instance, you should select TSS Node 2 if the MPC key share managed by your entrusted third party is no longer accessible. Alternatively, you should select TSS Node 3 if the MPC key share managed by you is no longer accessible.

In the pop-up window, you need to select the two TSS Nodes that are still intact and active.

In the next pop-up window, you need to manually enter the Node ID of the new TSS Node that has been initialized. You also need to approve the request on Cobo Auth.

Once the TSS Node has been successfully updated, new key generation will automatically start. All three TSS nodes must be online to jointly generate a new set of three MPC key shares in an independent manner.

When the new set of MPC key shares is being generated, the TSS Node whose ID has been updated will display two status (i.e. “In Use” and “Pending”). This transition state will automatically disappear once the new set of MPC key shares is successfully generated.

You must back up your newly generated MPC key share and store it safely.