{
  "manageEntity": {
    "action": "Save",
    "entityId": "638718376",
    "entityType": "Track",
    "nonce": "0x651824049920550ec8d5d611e3df4e7b3a2f2313905d1cac2689d0b431333bcb",
    "signature": "0xb70e324f1c764bf1df68e786262632fccafe03dc634eb5ef3a7416720c5f27bb26c7ad9a4376a814ed9b3ec7be21eac8d49864a9be6754145ed57120e18d020f1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}