{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xa553010c7ee56d591fc88782bc31dd800f088c0807ec381b3b8a367dd56c84d2",
    "signature": "0xf517dc343697d114f71d8badcea61c0c7f44ea6014d4df0da67a86b02ce87ef731aa4d1f9961a344fda16486441350a7453fc698c2a571d5a7e8ab3355c4416a1c",
    "signer": "0x312cA3CF75AaD528d8585cf0A1e77C14982AD0c2",
    "userId": "678902152"
  }
}