{
  "manageEntity": {
    "action": "Save",
    "entityId": "42769575",
    "entityType": "Track",
    "nonce": "0x179795fc5267cde456527bbfe6f5377ea679c29f1827a6b015c39c3bf34acd18",
    "signature": "0x97500995d9e1af353c362f0cbc48da276087cea49a6a1fea662c8db0e2ccd1a335fe0c7b84babfff3ce76bf30874ac95a255cdb5ed024b27902d39327d0ae8181b",
    "signer": "0xD9254B079e0e1571E56512C57188F2eec899054f",
    "userId": "854498636"
  }
}