{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xfaa1493ab25d9bba194aac23286ff8c2fdf2f804638f3b8524251247d06d8c72",
    "signature": "0x87386c444aae171bffc795ef2680b53852abbba8c6e288421c759df2f8100c0e49110de7f43bae484868be6f33b79c3b010064849dab35b70b58742e0aa393081c",
    "signer": "0x4446842c94cF74912474478Af728556d54F4512C",
    "userId": "103107825"
  }
}