{
  "manageEntity": {
    "action": "Save",
    "entityId": "288787377",
    "entityType": "Track",
    "nonce": "0x6255bdef99ad265d3dbc36b065b847b924e4fcbeefee92b69efd01fd03d22bbd",
    "signature": "0x6a59fcaf2a428f038856bca16ec032169f50817eccfa7a0a6d72cbaab0ced74b18a27a2f1a869033612984e2855ed5f93bcf7ddedd799324f9a1990a1440fd321c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}