​
Single Owner

To create an account owned by a single EOA:

const rhinestoneAccount = await createRhinestoneAccount({
  owners: {
    type: 'ecdsa',
    accounts: [account],
  }
  rhinestoneApiKey,
})

​
Multisig

To create a multisig account:

const rhinestoneAccount = await createRhinestoneAccount({
  owners: {
    type: 'ecdsa',
    accounts: [accountA, accountB, accountC],
  }
  rhinestoneApiKey,
})

You can also specify the signature threshold (i.e., how many signatures are required to authorize the transaction):

const rhinestoneAccount = await createRhinestoneAccount({
  owners: {
    type: 'ecdsa',
    accounts: [accountA, accountB, accountC],
    threshold: 2,
  }
  rhinestoneApiKey,
})

By default, the threshold is 1 (any multisig owner can sign any transaction).