{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x72d53b969a87a4aca5fa0dba9ef014f3edcc7f50a490d8337758a2d5df9962cf",
    "signature": "0xf2fd6c91e79215f7f6caad5daabc10bc35ccc7331b2d8d751ae8c67fec5bc8da42cf65ba057fd99627dd92cf4d649ecb4c4bd0d82f7280331438e63ea733bbd71c",
    "signer": "0xD3bD508AA02cBC11458635BB836b8bd6B3BFc7B3",
    "userId": "468287560"
  }
}