{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x8ffb8f4b9fd4bfdc55637ad498d0a563947b8e5f9c3b81f3782e807465e70bb7",
    "signature": "0x98606ac0300e89d63a55657313465568f389e32c27918789c3c118fb68814ea156c5b60b43a30d22e500abf6f85f0e92871ae147c7e0044530381f30137c1e3b1b",
    "signer": "0xCA34537176e273Efc43776B70B5c70CdD5baE067",
    "userId": "403911835"
  }
}