{
  "manageEntity": {
    "action": "Save",
    "entityId": "354830714",
    "entityType": "Track",
    "nonce": "0x497aba675c1e6e1f722c6e4b7209e2ccb672e7938bfb7814cf18b3bf4afc8230",
    "signature": "0xb042f11675aaac76eec179409774466bb887b21eee33f85591f2994855ba252e5c6290a9deff45e14b65137a7cf131ea485584aa6fb7bd1f7d9305750c3860ba1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}