{
  "manageEntity": {
    "action": "Save",
    "entityId": "201856481",
    "entityType": "Track",
    "nonce": "0xe28f6c785fc03f6f5fe621b788a689c3f7926e069d40a5625953e9b98c8b188a",
    "signature": "0xe18c93cd22fabc7a90e634c76674ab35a604cbf8459880d79a1574404ba9766c73b846edb69668ce0b66b9ae6b304e42e4d412b479b4dd0b799f9851b63295bc1b",
    "signer": "0x0b901AE3Eb7b439095858D82Ff194CfeD0Fd3396",
    "userId": "167557"
  }
}