{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x5a5822525f5dc8a13130bcebef3a6a3c61a31f31086d48fed0e771a3572dee3a",
    "signature": "0xdbd4ed37c59ac64767002f48052abee539570409595623c3f169503fe894e6f5628e41a2c7e4ab103ed724eed072a1dfc2e246d6aae06eb0f26e169edff3fd8b1b",
    "signer": "0x1d2Cf0589BE039B18f265a88e571dcfBa06C047c",
    "userId": "835577932"
  }
}