{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xa7f484c327e91efb5adbc53dfd5eebb1c45907a8eadddc7771b07f60f035274f",
    "signature": "0xeb58e4dfad51181eb60d9b29d1b35c773b13e2ac555af1ce3cb6b632c91f89890c688f87f87de55c757a8038922555177acd15ad30ce47788da025b21d03e07f1c",
    "signer": "0xaA4f4Bb2BfFD9A74Dbf95452B59877605Cd7f840",
    "userId": "637907967"
  }
}