{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x7fbc7e539dbfeb91dcc8dee9ce8684212c6106d234c08ffea14bc8dd403e3c17",
    "signature": "0x7e08b0e7173c70ba70bfa1054340b211a0b6232436d0cfa0d6911ef791ed2f924e9f04b8844eb81b058a240d8d4ad3cd0638cd1e70c1a1f2cc9c875080f083a81c",
    "signer": "0x65C5a7f8B0408F675AA0436F6B1d4d9F14FAc436",
    "userId": "635352921"
  }
}