{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x3b0729f3e5e64a9050f3151a5dae2190a066aab30e74c3fdfdb4f941e0fcbd51",
    "signature": "0x7ff440cddd724102bc744c753f48ee33284a0c610b13a76f3da7cb822145933a05b5528d5b13cfb32431472e5f1cbea83eda4ab8f7fdb6163851189c4b12acd61b",
    "signer": "0x509EF9C2a6431299770117e05f294Be4e5D591A8",
    "userId": "275210993"
  }
}