{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x142fb4e1d0b19b3cdbaeb6eb042fd2a91355c3373c45528b9dc40672c1be8d79",
    "signature": "0xe6b41ad457f02613f70369037e58827c2398227f49392d29fc34f971de4434f321ad457932bbd4980d17f5736cb89c1bd0fe82544c20cd22904c46c658fd615d1b",
    "signer": "0xe843310494834103Ba1473dE3e5a3233118eC791",
    "userId": "428362958"
  }
}