{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xc0254ff17e93d8a3d5e69e8cdf7d2e6813ffe76a7247aa825f5e960758f0e6d2",
    "signature": "0xa839ea033b70d75a323f5152071aa6ec5eb3fcb5dff717ae7c2e623ae9a3efe672d1cdf05b94ec9fb9284cce803c7163c820efc3c2423444e65ed48a56bbcb251b",
    "signer": "0x6eE5b8c52A9940e627594Cd921E79Be1015CB23D",
    "userId": "3838526"
  }
}