{
  "manageEntity": {
    "action": "Save",
    "entityId": "572204",
    "entityType": "Track",
    "nonce": "0xaaa7bd972f057398033658df86b66684a77b403bd047d86952add62994f5dd09",
    "signature": "0x2fecefee9d2dc69476d1cde5ba99090ff5b0341e4f35c40eefe61c9c9410e0a63147db2605bba9b73dafaea553a67ae6b22b8d5550d7e1c9d9929c83cdaa85ba1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}