{
  "manageEntity": {
    "action": "Save",
    "entityId": "637574712",
    "entityType": "Track",
    "nonce": "0xa9887aa3dee4574c5174e0f64586eb60c2db1644c138596955e73bea51a180a3",
    "signature": "0xaf21564b42d77b38aa264c7c736ae73f0cd76a9e6a6188eba6905ba77eeb493662725084cdbd8c3242fb0c4cdb161a1ffc3fa07c16f21b66dd07598e091d3a7b1b",
    "signer": "0x36d29AA5C780341f3b35bDE6c1411a7Abcf8794C",
    "userId": "571117272"
  }
}