{
  "manageEntity": {
    "action": "Save",
    "entityId": "974144354",
    "entityType": "Track",
    "nonce": "0x8f30a18a29f7d56d838aa36c4d755619c1875acaa49566e56ea36f2aea916f7a",
    "signature": "0x62044352a909cf7ea232d71966cf3daf29d2d58a4fd3eb5ed611257d0fb1f010492f2c82726eab1c1b9eede4444050890832e527bfcb7cdf04ffc16a0dd3954c1b",
    "signer": "0xc6A421843C183591853a72f2afe7AF4CcFbc4FA1",
    "userId": "344756485"
  }
}