{
  "manageEntity": {
    "action": "Save",
    "entityId": "650504247",
    "entityType": "Track",
    "nonce": "0x3b07791167c6d941f832181ef0addd984b2d9b60160e06e28f3215283faa64d4",
    "signature": "0xc727ae709ab71585a88f6e6e88b70f99c8001fedb64c7c33e8fd9cddd1baf393637929ea38a3eddfb6d6aabbf3e16cf824ff4b35d522c5348da243e326faefe81c",
    "signer": "0xD7c3dC9EEf2D94568C0e1A9C88b58696850c7C22",
    "userId": "125737"
  }
}