{
  "manageEntity": {
    "action": "Save",
    "entityId": "1502968081",
    "entityType": "Track",
    "nonce": "0x61fadd2c147a7708557368c9484c8a19c58f3096b56b50f20981c1634a1d3fae",
    "signature": "0x78098e83358cac92633d3807a9b7354cb1c3c7088a27ff09f3971f3f461b199665909c830441dffb58f28c6e0ad12ef47a8282e33e8ef660ddb3bf1c7ae64d8e1c",
    "signer": "0xEeea4f65FD2D7EffBC68176EAbe8544B088Aed57",
    "userId": "584616263"
  }
}