{
  "manageEntity": {
    "action": "Save",
    "entityId": "648889082",
    "entityType": "Track",
    "nonce": "0x910b6deec10088cf347ced4be2fd9d118b1f7a7c747cd5b8b1028c0eea75cb93",
    "signature": "0x48bf4d5bc3b63fa15bb28d25bdbb938bf49c34a2c6730a4f02bf489625b019d9216744ce65536b338617b0cd2a7ae21489d6fd8364e6cda42551f13218be93611c",
    "signer": "0x15B9643abE09bd37C52a5BD1dCF938B05b06cBFB",
    "userId": "370091516"
  }
}