What is meant by signers with vault details?

Signers with vault details implies signers knowing the details of all the participating keys in a multikey vault.

Multikey quorum in detail:
Multikey quorum registration on a signing device refers to the process of setting up and registering the parameters of a multisignature (multisig) scheme on a signing device, such as a hardware wallet. This process involves configuring the device to recognize and participate in a multisig arrangement by defining the rules or conditions under which it will agree to sign a transaction as part of a multisig setup.

A multisig setup requires multiple signatures or approvals before a transaction can be executed. The "quorum" refers to the minimum number of signatures or approvals needed from a defined group of participants to authorize a transaction. For example, in a 2-of-3 multisig setup, at least 2 out of 3 designated participants must sign a transaction for it to be valid.

Registration of a multisig quorum on a signing device involves several key steps:

Defining the Participants: Identifying and specifying the public keys or addresses of all participants in the multisig arrangement.

Setting the Quorum Threshold: Determining the minimum number of signatures required to authorize a transaction. This threshold must be met or exceeded for the transaction to be executed.

Configuring the Device: Inputting the multisig configuration into the signing device, which includes the participants' public keys and the quorum threshold. This configuration allows the device to recognize when its signature is part of a valid multisig transaction.

Secure Storage: The device securely stores the multisig configuration, ensuring that it can authenticate and sign transactions that meet the predefined conditions without exposing private keys.

By registering a multisig quorum on a signing device, users leverage the security features of the device—such as secure key storage and transaction signing in an isolated environment—while participating in a multisig arrangement. This setup enhances security by distributing the risk and control over transaction authorization, making it more resilient against theft, fraud, or unauthorized access.