{
  "manageEntity": {
    "action": "Save",
    "entityId": "287504071",
    "entityType": "Track",
    "nonce": "0x54769ba463185aec4bda7ae1cbe31cadcc0c20f8f5b81204c99d4d2e750f25aa",
    "signature": "0x2f8585c40efa7fb18444ac3cba8d3a5f4be0fbe8a0030959d5b8e27b8bdf79dd428d08a68fcb999a0ec17ee5e727b49caaf69aa25cabfc45e11f590f210cc02f1b",
    "signer": "0x568426a5D555ADe94657d547B2Df4a4dc1f0C014",
    "userId": "71569007"
  }
}