{
  "manageEntity": {
    "action": "Save",
    "entityId": "1357638060",
    "entityType": "Track",
    "nonce": "0x75733b8aa7865e77b0ff8575ad74c35a24bfe9b8f75365e49b4f0e3043ab0564",
    "signature": "0x4de57bf427e7eefd1edf027bd71a2b92c172c3583a065002de39f6b6c1c2343f5a2a73fb056b3574ae0752a8d517b3a9f4ee30a90e87a5cf586e06793d4845761c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}