Get the signers known by the aggregator

Example response

{
  "network": "mainnet",
  "signers": [
    {
      "party_id": "pool1234567890",
      "pool_ticker": "[Pool_Name]",
      "has_registered": true
    },
    {
      "party_id": "pool0987654321",
      "has_registered": false
    }
  ]
}