{
  "manageEntity": {
    "action": "Save",
    "entityId": "768219531",
    "entityType": "Track",
    "nonce": "0xf39c6dbf8a27d3a4d840ab3ada9bb08404668f00cb8a6ef8ccc9495ae77a51c2",
    "signature": "0x8603a893d1718ab172cd26a17876ec818c9c0f74192c91e8409bdf1016b44e9d70a6995a5126793e2c96c5a74a0675d24a94cd83a671a076586cd09e1088b1b41b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}