{
  "manageEntity": {
    "action": "Save",
    "entityId": "480377875",
    "entityType": "Track",
    "nonce": "0x9630065afa9ecf88b56ba98ca1f9c056036178bb7d0c66689c8473268089d6d0",
    "signature": "0x7749b97770aab1b42d661daf9607a1851eca2cb9d49455a1ae7e5a432b19bc1d6f879e1fed23d1bca677d80c1e96115c9ed7034bc444b89645121877f4b452ed1c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}