{
  "manageEntity": {
    "action": "Save",
    "entityId": "1619413475",
    "entityType": "Track",
    "nonce": "0x61c8c966c878b4c74638fb93d088db9415936f586b6cdf71312b90203e987ae9",
    "signature": "0x972ce54b9807daa8ad97b6a574406a4eec65b652976d74f60d83efe2a6fed1ec37adf256024298a97b13a9990ae37f76ba994ae89c0678c06d56dd3ae26e6ea01b",
    "signer": "0x44Fe9338D9d1405927C73FDA0be0F36ae481Cd39",
    "userId": "983568397"
  }
}