{
  "manageEntity": {
    "action": "Save",
    "entityId": "340492736",
    "entityType": "Track",
    "nonce": "0x4e71af92d1b4a939d51008eee6f54c652eeedced52656859fc8565dcdc0b228b",
    "signature": "0x58e6a33d1bb4fd58b33d02fc2c1acb443b956a9c6c9fec3056fd9509ea51b7c9720070d04021c710f8493615f266397a5f5fe28f21cf4b45e7123c7408bb0a481c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}