{
  "manageEntity": {
    "action": "Save",
    "entityId": "659059893",
    "entityType": "Track",
    "nonce": "0x18174d6297ccea4055583bb7e18846ec28fba745bf30b0e4bea66ed5df30fe3d",
    "signature": "0xde9434df36d63ad8a82d4ee69e4aa6183cb09a49e0c1873e915a3aa7557bb46d3a9ad789b1b6c4cd9ddd73a52116d074231acbbfaa4739dedb00e3f3282421d91b",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}