{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xf227badf171a9dd42338257338a41177f3a69f60d649a2ea2f1105a7c6fa5299",
    "signature": "0xb11d51c257ce993be02d59ae9a704a50ea4c0001e2724ad0083771a3ec58f3c72daba1ea1b15ffd5ba247ada98f8b050e6a5ce197db26f34f8ff7b3525aadf321c",
    "signer": "0x31C077B1b3cf0d25FE245554344C06D104Def192",
    "userId": "783504001"
  }
}