{
  "manageEntity": {
    "action": "Save",
    "entityId": "1619088787",
    "entityType": "Track",
    "nonce": "0xc638991e0ebd02fc8a8db05591330ee673c6a5b315350c6c1cff78715b1d303f",
    "signature": "0xb591b0e7f0ae13793d5bc1dcc836871697733b79997ddefd190f686482f4db9b2942d24ea1c82cd97f1ad610aed527d13bdd7b38cbd2c5ba1542524fb94528231c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}