{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x63a4687f5747ddb27db8727f6a3eaf21c19ab662b1cb38c14af71538a9563684",
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    "signer": "0xc9dC0890a868C421E2eD48aDD2fABD63c8B71B9f",
    "userId": "893310146"
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}