{
  "manageEntity": {
    "action": "Save",
    "entityId": "1832789274",
    "entityType": "Track",
    "nonce": "0xa0989d8a19ae078980581671447f4deef02b6a59c0eb57cfa313a735f353092d",
    "signature": "0xc6d5f15fd5e5b125a8071b5f24b17639c0993a0bbc6c28a57fbb745d91292ee11485a8d1b6a9a9231c0a24601301a6966e5c8c11e10009ad28375cdab8ed70a31c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}