{
  "manageEntity": {
    "action": "Save",
    "entityId": "574199",
    "entityType": "Track",
    "nonce": "0x2c917f4318052e5f3b60c1f9795809c6fedea05cefbf04e266c870f482f1ef45",
    "signature": "0x010d7331a469a62d4a36ccfdd1acf9c8a7f48edfe0224b1948fa58b45c5507c93d0a49a82843de6c3e6151ecfc145bab15c0ce17af11fc064ddd1a5faed9c9971c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}