{
  "manageEntity": {
    "action": "Save",
    "entityId": "2001221420",
    "entityType": "Track",
    "nonce": "0x8de1c61c5ba931f3630a85430ec1b86c94dc6ef7bb38060dca48693b88d709d4",
    "signature": "0x45266d98804b76cc631055a4ba450981cfc93cb5fbc71584a2c26008ea1cd0fd7e88a3d9c3bbdc6fc6b3a17ad092126c35aaab08ee60a6e8d86bffe6ef1850631c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}