{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x8a6d1c1b16dac4eb99ea26b25169be62c125bf61ac78d6264d9f8789684433b2",
    "signature": "0xd6dc3635158d6506d2367f504a2073b77cca81319608c5709cd773ea17cec4bb6dc5f9459dbf70b8dcdf834a1068220a9034f0ba0f7870f5d41ffeb1c3c07c371b",
    "signer": "0x19c2A1f9154c011c6A9C2Ae666c46AB9951bB027",
    "userId": "783282564"
  }
}