{
  "manageEntity": {
    "action": "Save",
    "entityId": "243573785",
    "entityType": "Track",
    "nonce": "0xa052951f094e680d4384fab2e57b64bd557af874ad15e0751747c31943d7f9d2",
    "signature": "0x1e54d6c72eee0a469f742a026a57a541769b73f37d2ef846f8c201d9beee06b8065f460f2b6dbe62b4e3e918e313ad2ec67fd7cdb13e4c655d13c2ac855e0e7c1c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}