{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xf5b209f5cc8206d9d6d72a08584abdc2321ca2e4191c2c56f6b59ea3fb305a00",
    "signature": "0x7368b105ddd77a22cff06a39197feb8920137017c09c6eda40d81a2036a3c33869a81ba64c2d1ffea7e3311f54581c9b7456764a73f828ce94bde520026885061c",
    "signer": "0xc491DB77847e3156B64923635C177F4519cE81Fd",
    "userId": "410718605"
  }
}