{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xc3488a2d8f281fdac2b128f26f3e02affeeb2d55bf6eecd47ee6b169f07b3b9d",
    "signature": "0x91265d6fd77418e41be7877beba66188f75dc1e858b062d4e1a58582a4907d3d5d2de39ed68d0f2b540eb4b1ded14780ca19d2f04509939cb8173cf367063a0f1c",
    "signer": "0xE1F369B8fF59A502D20c16E0C175b6884c03182d",
    "userId": "768100404"
  }
}