{
  "manageEntity": {
    "action": "Save",
    "entityId": "814690038",
    "entityType": "Track",
    "nonce": "0xa49954bd19b55243ead8ac2e2fe75003822a4607ca6c006a3a81b672cc92730d",
    "signature": "0x60745bf6d6c1792577e8d6b7c0dcf4cd29723fb44e04c6f86ab86ce6576a86927b6c85d6e77f0eeb1d9332cd9b92ec4281687db51f0e7c519828f2c9c8533fd41b",
    "signer": "0x712Aca9aA6ac07F98dcEC338Be9C15c3Dc47d569",
    "userId": "12730129"
  }
}