{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xbdf23a29f6da440b7df791141c9613801287a8810232e72f4aa3738c4796a32f",
    "signature": "0x49e711952a4518603d6751758f73a063ab352cc0dbd19cae2babcffdcdee92c949d1f4161cdfe2d360b63b31490b520e1346026bcafe8a36db3ab35bcf17fe621c",
    "signer": "0x345F527120644cd5f6AaFF3800A2aF4498dfe219",
    "userId": "519995777"
  }
}