t() :: [
  %Blockfrost.Response.TransactionStakePoolRegistrationAndUpdateCertificatesResponse.Certificate{
    active_epoch: integer(),
    cert_index: integer(),
    fixed_cost: String.t(),
    margin_cost: number(),
    metadata: Blockfrost.Shared.StakePoolMetadata.t() | nil,
    owners: [String.t()],
    pledge: String.t(),
    pool_id: String.t(),
    relays: Blockfrost.Shared.StakePoolRelay.t(),
    reward_account: String.t(),
    vrf_key: String.t()
  }
]