{
  "manageEntity": {
    "action": "Save",
    "entityId": "1402319391",
    "entityType": "Track",
    "nonce": "0x9716471244c7bda60c6b2bbb42a5b4e638ba6e228817c422602b8babe0673c82",
    "signature": "0x95663ce3e7c66fe8e3071cf81c411982f622029baea25558f3d5cdaf7d08b6b865cfa2b46f2669d8c1e382c8209fed618695095a9890d1cf010390a445ab4dd11c",
    "signer": "0x4a26E1fdd6FdeE62e6A343d231CF3700Bf1e26bb",
    "userId": "55875"
  }
}