{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x90431fdc6cf313928347716823f08f7255958eddaafe9a0f6fbe7c4f03a968f6",
    "signature": "0x263b5649307e502797ba1ddc321ad30573fca7c39fc943b3bb9da790c24e32323d1e661ee1915b099100f0462a23d04e3b48d571211e66c8cae89cec9919cd8b1c",
    "signer": "0xfffF643204D053ae5bFC296Aa20F15313084C719",
    "userId": "473911971"
  }
}