{
  "manageEntity": {
    "action": "Save",
    "entityId": "1309780980",
    "entityType": "Track",
    "nonce": "0x28bf66afa57e3b480dde2771d4d0122343fa744f327413fc98d9d19782d6b7ea",
    "signature": "0xf39eceda1c7c0d1842f0c840a92828a0810a89d7e2db433ca8e26f4aef83be107605c4ab2b114ff31f252810ef5c34adb4e6ff482e6a28452492b1da3a5c77ab1b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}