{
  "manageEntity": {
    "action": "Save",
    "entityId": "1570242322",
    "entityType": "Track",
    "nonce": "0x9bb6440c4c21f2550e76f7eb8e2ea4f02a4a94477e78ce32487a563012b7210b",
    "signature": "0xf4d97121e353f40d8ccfcf0de6621d817c1a2822a0652c1498594c7b2b97aef0084db4faefb6c472e06aef4ea303cc5548d64a3b4c1af4ee972045c3bbcd22e61c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}