{
  "manageEntity": {
    "action": "Save",
    "entityId": "291572",
    "entityType": "Track",
    "nonce": "0xb900e385700d3f73595983937271f7b6abb08b7dae3dd850ca4f095bd9263fb2",
    "signature": "0x897e4e770b7c19e2d90957de02b9236f6b5f9a0a4ec32c98019f5515709ee2927343b9aac1764011fef0e9a775641325b726756f246d303809c0833105a8d7ac1b",
    "signer": "0xa8E11aa224d2579f5cbdb912866bCE84Eb10f9dD",
    "userId": "951616224"
  }
}