{
  "manageEntity": {
    "action": "Save",
    "entityId": "818282655",
    "entityType": "Track",
    "nonce": "0x993c37331e89495527c665545ca4cc77fb8a261acd849183343812fa3cb8e7fa",
    "signature": "0x29aaf5e6ef92245ef5a959d913a08923d95d5e5fc5821af51a298a396d17a98f13199bc36ce8270d6a24844293fafb221c365668658a3e01638757ad4c3186bf1b",
    "signer": "0x45C74e4f36E4e5064C5321eeED3748fD52B04eA8",
    "userId": "133970929"
  }
}