{
  "manageEntity": {
    "action": "Save",
    "entityId": "1588406828",
    "entityType": "Track",
    "nonce": "0x0561e836be8243901814563eeabac2b99d936581bc515a1bbccc51e918571706",
    "signature": "0x865aa7c0f5492a3ca7e3fa4986dcb0f473c159e188e83d593e746af348eff3bb055ae2196c260a6295e318dc675a4e45aa5284f9c3f1440632ff4b44854ae68c1b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}