{
  "manageEntity": {
    "action": "Save",
    "entityId": "391846791",
    "entityType": "Track",
    "nonce": "0x1a72f13a9c05f2595c5e9cb376b258afeb1d95a72cd526a51c038da84a12003f",
    "signature": "0x2b0c31c743f07d2aa214f931c29a2954cb53b6af3c9237c79912eb076f8e4bb15051d04110a91a38b5575212615b9ee9dfb4b1fad6b3bcff874b90f41e184eee1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}