{
  "manageEntity": {
    "action": "Save",
    "entityId": "454372",
    "entityType": "Track",
    "nonce": "0x5fc4539d03104d0415710a6ec5263bacab29312a18a25756d0442c80d8fa33f4",
    "signature": "0xadf7736f00465063083667e10af865d9a7da217f15287b556f2d0f4c4d5533db1ab839be8f5530530771437a4c1a2666669cb78329adecf05f4dba631c59712d1c",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}