{
  "manageEntity": {
    "action": "Save",
    "entityId": "724253343",
    "entityType": "Track",
    "nonce": "0x973742d2779c202b4139d4f2eaa8e2cb47db45f0870d93bc3e7cae0ca9beb543",
    "signature": "0xad0f93d089c0c53bac54b0056c8bf4d4803655130043b040e4c23346348724c121b807af9c3efd5274ec8dc5f06239d8410de6cddc363532cdf6e7c711ef99041c",
    "signer": "0xf63b89A0Bbc03C7ec59aC257C7082A056082cDB8",
    "userId": "558452493"
  }
}