{
  "manageEntity": {
    "action": "Save",
    "entityId": "1303714382",
    "entityType": "Track",
    "nonce": "0xe50b603838c3040aec508149233b3bc9b2af99934ed58ac5e76eb3578f9ca2a5",
    "signature": "0xc88d927d70698262bb7c167f84f70ebd84ee075e3fb3759d4fbf1d247e8b8b2049088290b246f8d686b29394a78c955f3000738b031e103123ed90fc331e117c1c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}