{
  "manageEntity": {
    "action": "Save",
    "entityId": "445337689",
    "entityType": "Track",
    "nonce": "0x3801a80013e2b71d4c87a81096f90292c6558faacd32c4e8a64cbe1c45675ad8",
    "signature": "0x0841697a28a25ef9528638df385182794f5d8cd87507e95323412f9617517c5203d276c290e24a318d8c2d0e6200a77d96a9851dcdd9e880dd09040cd3cbbfeb1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}