{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xda7a1d205f9c2e09792baae39985942e84bc794371928ff4814576d29e786c59",
    "signature": "0x0203f03c2e72737914d2f5223db1aad48595f697915dba1d34b2415d24ece94c6d057a2a509d67a489daf15f01f66f7d5f53ce08330c9e6a76179917cd6c1b5b1b",
    "signer": "0xc4171163317349E551651B3d39a6B438C0ab38F2",
    "userId": "112211347"
  }
}