{
  "manageEntity": {
    "action": "Save",
    "entityId": "1551745141",
    "entityType": "Track",
    "nonce": "0x81e4f30deaa9d66b72d2856d2333ae367b05fb738f155a36022de224398a071c",
    "signature": "0x4d6fe18de903260f5072a3bfd5fdf94a0e0f730ba0c4a71f632cc77723ae94db0924a177a8aaef44fe4163890989779f06a6ec5b94c715a2b0f68c36d02da0151c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}