{
  "manageEntity": {
    "action": "Save",
    "entityId": "544320",
    "entityType": "Track",
    "nonce": "0x155fd1789b59c7d0da62ace6e6df200580ea88f9c8017ab27643c09cdbcbf260",
    "signature": "0x88942198af8c3a1814722c333d097214e46464c43f9697881d2dd2d5d5ce37ba0c37b3e29539116f9eb0fa153904678c1803c3b00d8d6f703901c3d9fc7e1c8b1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}