{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xa8d112d30d7d0338a48f39eadb57b16f9522a46bbf57567917cde45464eb66e8",
    "signature": "0x86958d0488cb380f12a4ab8741fd8ba800171515ce098ff2d20b8b4e6494007c5fbca16e2c65bb258d1d53a683b5cbbf91e053b75a2403f9b9dbd8b56c3d65d31c",
    "signer": "0xd66DdDC5FCF82a48132f6FBf396EEF8904C28bF0",
    "userId": "821334815"
  }
}