{
  "manageEntity": {
    "action": "Save",
    "entityId": "464923",
    "entityType": "Track",
    "nonce": "0x8f48709869f08b0787ab705f9fad71edb278445c5770a6e4663c8b96c594c9fa",
    "signature": "0x6c00e1f10a5795b55205339379f759e25b66de405e733660b8a3db1606157dfd57baa985c57ca97c312bb5a1c05d02377943120f591d38a65604df00ddee6cfc1b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}