{
  "manageEntity": {
    "action": "Save",
    "entityId": "487543831",
    "entityType": "Track",
    "nonce": "0xf505d1c19af087a1da94c92fff7feb04d3834cca6610d8ba30e1f1b1a4501a78",
    "signature": "0x8255f71de746bfd28270e585cebbbe62996706cf6b2b380095b8a9417808243f001efdcf7dd5777635a4483f9c494bb6a453d1baabb51cf2f36e897f6388ca161b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}