{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xfac151433b6b979e66a99a7f20a7e72e9ef942d8b50a65f0f2d4d32198b00123",
    "signature": "0xa68bfda7564ac16e6067c8f05acb8219741f2bfee98650732adcabef3da7710d7fcf50d20b21cf4bfe6a12fcf450c792b9ebced8c82659e23d53505d875592ed1b",
    "signer": "0x9C272d975b8a58D6730117A600Ad9254EaBB1be3",
    "userId": "754168227"
  }
}