{
  "manageEntity": {
    "action": "Save",
    "entityId": "1804338186",
    "entityType": "Track",
    "nonce": "0xd2ac78ace92a2423a827101ca294c8ede859fc48da1cbbf0a8f47ef073b1fc74",
    "signature": "0xacfbd0d21916a708334e29d8c0af8dab466eaf1416d71e33fef24e87a59191ee368d7496983817dbd91e6c08b4321705441cfe5d3575858b9db9414555bef58b1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}