{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xc6bc7b7b58dd0d453c7216de5b50c9cecd7daddb89e865be8ae14a33f6e24001",
    "signature": "0xc23c8652618ac9feb81ba2da578f23f0bec7fc10397a53dab8ad65d7d274301932ca803192f7a33ff1f150079493e79d90aeb90e2e0823bef3539ce62ca13a3e1b",
    "signer": "0x140f7DD4B61B1fdeb532936A8a73C5cFaD2c3c4B",
    "userId": "636553111"
  }
}