{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x6d125bf933dc07ddc60015393ea52dc31af3ba7072860a77593e34ffcad63abe",
    "signature": "0xbb616dc8e4c64c2d271bcad41f17f839942049f103ba056bf479985f31271b4b3055e02a6b1b2f23868d932590e83c0b88c96f26c4f2ca9ad02c6673aceeb3331c",
    "signer": "0x867974fBD12c8FBcde06698baC610f0A7ca404Ea",
    "userId": "390409168"
  }
}