{
  "manageEntity": {
    "action": "Save",
    "entityId": "1373562858",
    "entityType": "Track",
    "nonce": "0x1a48cac6089816eed3d9f17dc248c49d7bb907e0a23479c7cf11312627b355ce",
    "signature": "0xcd621552058e21d17812d13920c9251ef4f7baee9447e91b8a18050e39ed42e831d35c5f53eacb5312efdaaf4522c9ead6ab0fe1ef52f4aaaf2cefb8557f900b1c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}