{
  "manageEntity": {
    "action": "Save",
    "entityId": "474540973",
    "entityType": "Track",
    "nonce": "0x53d858cbc8ef83d1328e22d0e14068d9788758ab9aa5c4a3de1d046d3c0f8d05",
    "signature": "0xa5cecc89b596dd005258cea55de9d4824432b582d66b5317d99962d50f64eb2723aae117b80db22df41960a65b778b3998974e89d7f02d9dd6802dd4bb79481b1b",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}