{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xd4af7281e4c8b5fd0f4b9a85a97ece5adebdb79abaa92e5ca459c775095306bd",
    "signature": "0xab39d154475d2e1731a64f3b7c48add27dd6d1e877da877b608e574aebee28a15f49fef97e0237ab2d9dd216dbbda7d76f03a7c2d18642131d841960f444e4161c",
    "signer": "0xc4b12DEd7d7039ADa37F4140dE01D41C9313b393",
    "userId": "658075403"
  }
}