{
  "manageEntity": {
    "action": "Save",
    "entityId": "9902445",
    "entityType": "Track",
    "nonce": "1792449390069029059",
    "signature": "0xf043fe30a7cc7782614cbda9cf32955dc9c38b1727ea6158ff02cefd8014fe8e7e14f27d58ba2315486dcb0d5774bde3f3475fac74aabb49cca34505c1ae48e01c",
    "signer": "0x512F9723ECbDB6Dc537A671b3D2fb35CC68017a4",
    "userId": "105562689"
  }
}