{
  "manageEntity": {
    "action": "Save",
    "entityId": "551507307",
    "entityType": "Track",
    "nonce": "0xdb00ac7f06b9ed86bbae85db66f34a73e8b613da9335276fb2241e362ed29433",
    "signature": "0xa3a6def1837a921da41fa7e436cabf800af624677f32ed1386c97309a7b1bfa863ba8432de8fa3283b6819832708a7e0b99f99c3f6db9a6e0375194d708b50361c",
    "signer": "0x4d1CFca68D1A0fb43CE2a6bd50477539F1eA098F",
    "userId": "334081624"
  }
}