{
  "manageEntity": {
    "action": "Save",
    "entityId": "2000839140",
    "entityType": "Track",
    "nonce": "0x2241ce529a40762c6b0182adf08facf39707829baa4c581f11e05e7a8a6dec31",
    "signature": "0x3f63dbbfc204b74b171414c172ed2aa23778d9277120ea35613b0ccd1a5554b06cbac092a68650fa0c3888f163a9ba7e2a48c8535aed0304f794d729ec6a6cbe1b",
    "signer": "0xA4B0C175920655a227577F59B8b7d134256B5386",
    "userId": "450369035"
  }
}