{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x2c921808fbc147c9d21dae4d4f6a9536ab84449fcd86a37d81d601b1a55e1b53",
    "signature": "0x6973f9ea8425813c0e53d862fdd953a05dd71bbdbf08529da2328f840bc30ca3195937a58e2db68f91e233dcdbcea3512d9c68fc5835585bcef5ec4bfca60ef01b",
    "signer": "0x69a3602BBdDb99584889e5Fb9f48536e32560104",
    "userId": "453199874"
  }
}