{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x237c56d2b04732104ef22f841e57356a3b7ef381e1a12ffa184448f054e5ca30",
    "signature": "0x58cd6ef940ad17fb60fdf7ce6cf03b8d3da6ff1daca042c3e02d37108b7ac8d723f2f9faf1b1383d5a7193e95bc2dce1aca4c5104b50e13702c3ee96db0d9d141c",
    "signer": "0x9900c072ee2C011451487770417b5A59d57FbE51",
    "userId": "421539700"
  }
}