{
  "manageEntity": {
    "action": "Save",
    "entityId": "369647",
    "entityType": "Track",
    "nonce": "0x14b81cb87dd6d6c402c16277bc3955ba422742ecbfb764391b70d50e436ea2d7",
    "signature": "0x517cde37ae728266064c3260a17f229fb8fb6b3bca8b0017a4ffda2811e2ab050a0478f7f52f6d68028f3849bab66f232e3807c36a874240b76fd74e341b0c1d1c",
    "signer": "0x4E3828bc809fb5B9deb81fa536cF73Dd5bF4eeB2",
    "userId": "185184169"
  }
}