{
  "manageEntity": {
    "action": "Save",
    "entityId": "1455776428",
    "entityType": "Track",
    "nonce": "0xfa44f0e7bc462ad9090606eb0a93f7cc35a115aa961415672722e405fa8954a8",
    "signature": "0xfba0330fef672d3f7b3dd67498430926fcc983e1097a80b1f7594d4c2be8f0bb36cf5a383ef3000319897a955d094693b3525a0cb2b0b1a961ee548dfa0efb251c",
    "signer": "0x2F7db4C1AE3922aD0f32CEdED1870278dd17b64b",
    "userId": "467213409"
  }
}