{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x90a3819a1ed2df02c7597c86bad676357df0aa1706159104d6f1c58be2bfd039",
    "signature": "0xc2b3836b9c355d51a2b65d7355c37f83abbae9e172397b6ac0408912fcc392464d940632ef38e16a06918b86d44c1de8ec9fc65aedca3826d0e4b3f38cc7e07f1c",
    "signer": "0xb99f008ffd166649F28b127d6e721f6989896e7e",
    "userId": "868091040"
  }
}