{
  "manageEntity": {
    "action": "Save",
    "entityId": "306677423",
    "entityType": "Track",
    "nonce": "0x2db7c2f2227e2ab52e6d9f96d8565a5716436597a0c1a0c83b7381b315678106",
    "signature": "0x922f11339eaa34c972203bb6574ba759be6165c1c713ab03de4a67268ddf206a72af2b6c7184516d2aeab5c8986f1593082f741c85cf97aed1aa7b049b8cf7801c",
    "signer": "0x4Aa8154A33F33394BA8De574d71aC98Ba6A47D5a",
    "userId": "645720561"
  }
}