{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x4b43e94fdb36dfc8061ef9ee213aa0a03e1613bca27cd4f03a93ec43e2da3fa0",
    "signature": "0x3c5dd40ddbdba040ea48a70e2d03ea10ecf3c14cedcb6e984faf490e6cf0da8010c229e776eb96efa7798ef3413194604e71dcf2eec87ede97ed037b7fd989891c",
    "signer": "0x83e386fdA0345C20bbbd1Af26b674A718d0714Bb",
    "userId": "440765480"
  }
}