{
  "manageEntity": {
    "action": "Update",
    "entityId": "1452422838",
    "entityType": "Track",
    "metadata": "{\"cid\":\"\",\"access_authorities\":null,\"data\":{\"access_authorities\":null,\"title\":\"test audio file\"}}",
    "nonce": "0x879e4c1dbc60c0893e4262856deea25788f599ff9521dad315c7ee0e1bbd118b",
    "signature": "0x8a8453d656b205af2fe1a44e7a80e2666932209b28fb31bf0912ef49b5c939be5468c401f2395e520f906ecabe9824267b4e953e51b13daaa4f3efbe86bc703a1c",
    "signer": "0x8C5ba66083D1ef52d5Caa8b250E7b66f4C21E272",
    "userId": "748327774"
  }
}