{
  "manageEntity": {
    "action": "Save",
    "entityId": "1618445716",
    "entityType": "Track",
    "nonce": "0x719d1380cd58f3e45f766276cd10ecdce48cee5941209f951aea2d0f15e11f62",
    "signature": "0xdf20b81a1df380a878dd9305b49b4188a549299363de00720f62daf4aab711eb6002c811a4fa0d3b60561366e886f5259605f7e318996832fa610c1889cb1b291c",
    "signer": "0x793bbEFbb3Cf1e6529B90296e502145aCcCDE8d6",
    "userId": "838777725"
  }
}