{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x7e77f80b3088ee76d713cd7435e73336a3b9c1b0afdfc268e8cd8ea32d7d4768",
    "signature": "0xa01d4eefbbb93f01703809e0debd83403da1c20a0ad096da85ccd141577369c87c7331fbbd00abd9aab0fe93e4a7b323a14087c780980ce7dcd86b873327ed6e1b",
    "signer": "0x96529BA0eE1b687D357698B79290Fc6b83475E45",
    "userId": "639933802"
  }
}