{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x57a585afbe3a894f3f4f44d60bf86b75a962e24eb9686dc1d48b0852dafcc0cf",
    "signature": "0x597b27722d76d907aa6d08978acdb6d366bb59a1ed52779202d533c780d4891e7e588d472772a2f4b3e3af44a12323b36990fca928c7faf40fe65d2408ee19201b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}