{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x6c4bb540c9c116d129f4d224ac4c2feeef999194b99576a8f04f56719ea33334",
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    "signer": "0x9E576B822F4873B0aEc2E4D46715EeB5fB00936f",
    "userId": "941343958"
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}