{
  "manageEntity": {
    "action": "Update",
    "entityId": "520037825",
    "entityType": "Playlist",
    "metadata": "{\"cid\":\"\",\"data\":{\"description\":\"\",\"playlist_name\":\"JOAN\",\"is_private\":true,\"playlist_image_sizes_multihash\":\"\",\"ddex_release_ids\":null,\"ddex_app\":\"\",\"upc\":\"\",\"artists\":null,\"copyright_line\":null,\"producer_copyright_line\":null,\"is_image_autogenerated\":false,\"playlist_contents\":[]}}",
    "nonce": "0xfed7fc59a0e8def7c442818fb1b840eddf44d0aaf4c63ab3ab8794c55456dcf7",
    "signature": "0x20e937ff8fc5280ff5d923c8ad1a2537724cbe6bf4f4191f6be6f5ff7b56a99a12e136c6660cdf0602769847fa924d812d72149c7696fcb5b7d97e25d8d876a31b",
    "signer": "0x506C9A5705a37D14362821675ac64F9B591aF1F0",
    "userId": "872348098"
  }
}