{
  "manageEntity": {
    "action": "Save",
    "entityId": "154105482",
    "entityType": "Track",
    "nonce": "0x8656c66526b8f9e3c9aafd5bd5fbe2f3d19ff8dd02d224062101ddabc3b0a802",
    "signature": "0x12cb850550f8be5b984790ce42ea37bddfea0613cb3137c687c680a17c92547d7ac12d1a705b42453779c96dd05fb6dba789fed7fcf4d4298b95968f2fb7d0f61b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}