{
  "manageEntity": {
    "action": "Save",
    "entityId": "252519522",
    "entityType": "Track",
    "nonce": "0xef3b3475ba36d87ee66ab7c73a1cec3a386b3ac9a755895d30433cbb40f4a4be",
    "signature": "0x0c3347e1addd6d476b509435c7b580c5f432eff7a9ba73854a0f9c9b152c9a37394bf9ca0c1eef159c359d459f62dd5f32c19e5f7a048b466e61be4c4003dd541c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}