{
  "manageEntity": {
    "action": "Save",
    "entityId": "1921882596",
    "entityType": "Track",
    "nonce": "0x1d7b9a7805b408d2078dad2e954f2eb010a1761f13873b96911e55e804b999f1",
    "signature": "0x8d23e21965bc0c41a7affa93df415cf4a622bfec84d7f881b73fe9e0a95269244763c7cc0897593b21d7e3f46531bfcb2156b61aa426dc4af99d26a8858c47ca1c",
    "signer": "0x4086Dda2D91F77cd46De0859a4de37F888508faA",
    "userId": "568518925"
  }
}