{
  "manageEntity": {
    "action": "Save",
    "entityId": "1289524997",
    "entityType": "Track",
    "nonce": "0x3c0888e4ddbd72f0dcef12924a2e87b48f5e5b0f43dfcdd396791d9bdc50dbf2",
    "signature": "0xd74ee5e4f17cf2241cab4447c1e6ea8babc16c4c8f6ccfd2601c100c819c6275618a00de6a011d340c3aca0ef75c684fcf06376971aadd33e9eb38578ff971bc1b",
    "signer": "0x45c4f1dcE13eeF476C74C5758696D56137253980",
    "userId": "824478223"
  }
}