{
  "manageEntity": {
    "action": "Save",
    "entityId": "731266",
    "entityType": "Track",
    "nonce": "0x428e76fc7df7727180b1bd93a4874c96d946acdb2e7f3f497bd75416223c506d",
    "signature": "0xfbeef7681d48831f3f2da17d8ce03916c340baced394f57f66f94ebcdf20678c1fe1d4e5f4a6cc53faab9a79e9da8575ac3d7353652eced40cf3002878dc16cf1c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}