{
  "manageEntity": {
    "action": "Save",
    "entityId": "971723",
    "entityType": "Track",
    "nonce": "0x9f352661aaff97b8ae56cc13a8ebe9593e605a32ade5f74af6adb808bdac03db",
    "signature": "0x3f97fe3144306a9bd572d88646e1e2f41602f21eb592cda4d4564fbc02e6703515309c64818758df8af69bffffe5cbf507e13d1ca41e2441b1823195ced618ad1c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}