{
  "manageEntity": {
    "action": "Save",
    "entityId": "445582472",
    "entityType": "Track",
    "nonce": "0x9ac7562343c6851370989d351452fde07ec538f99ce03bc4cf6fc794def048b1",
    "signature": "0x5f2ef8f040ba0a92fbf559ea6a5bbbefcc8c35c2a851a9b48589aa1c502ee6a303a4f718777a4b04e4bb4d8704f51f077f4e54c69c1480d4c59bdf600ffbf2341c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}