{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x8c7309b0e94454a55e785d509a3879bff54aeb0ee71c5eb762f8aac5a355e1d5",
    "signature": "0x454d4b72bd5dfc8fc2729ad1036eedba3c1874658e8be83d3e67b4cbc128a25c662ea2a7cda37a19c5ee855a7dccd8311e16e8f1ae7daf34de5e54a96ea915041b",
    "signer": "0x7F5B701ec5cdfD606256924C9e751d9Aa248084A",
    "userId": "456994864"
  }
}