{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xbd0eab2c12ad4f9fd4cc07deb382efb077e970761ac343aa0da8655b208f27fd",
    "signature": "0x6c6ada1c78314d69ce21e66f4333f2e295f36342ed8c4c38df352a8ff958f2ab4a84d1bbae6d236edf4b59cbdd0e63e305560b4b160ecca4f4369e1d8fec65221c",
    "signer": "0x28d35fFb3a1A2061F15257d5A1f4d01C3E69A01c",
    "userId": "776753824"
  }
}