{
  "manageEntity": {
    "action": "Save",
    "entityId": "745757118",
    "entityType": "Track",
    "nonce": "0xa5f4099d88ed56455bf5b44cbf8f2f425a27a91c83db212eaa2bab7c96ffc67c",
    "signature": "0x14ab804d2e2a076821a35188082dda278410e5ebb32b15a83fdcd16e509ae9b21b638fd0c8c7272ba5e38fbc2bc764fe8997cb785f3230d52f0493e82c0d2a5b1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}