{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x9b1ddc44afcc9803370be3f83af751c0c70d781d6affd83a8f267dda454b01a5",
    "signature": "0xb36a2fb0b1d5d3412d5796c62c6b7b215f697b0678f09ff7075b20e18d27576113e82ea29b6c8c18c3116beefb2a2434d739f8b91031541a0a1c2591b31f2dc21c",
    "signer": "0x58eE21bfFe569da412DF67281f3fD403a5f2F8F6",
    "userId": "764092920"
  }
}