{
  "manageEntity": {
    "action": "Save",
    "entityId": "919050",
    "entityType": "Track",
    "nonce": "0x572bdf933b9caf6ec73eb8d28b71577b664de05af7ecbfa32b8f6beb1958a95b",
    "signature": "0x4df67d916aa4a93857f1937f524f89991285811ff9a6d305263fbe3069fc6167329212182997d465e0f3db887e667c2643528db3438380ed305308322d75ab0c1b",
    "signer": "0x742Fff9be20F80Ce7285c8Ab12B9018Ef3Cf14F0",
    "userId": "111467392"
  }
}