{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x92e211a0fef8cd23400707cffb226177883bf7cd2fb4d0d1905e8f0727d6b2e9",
    "signature": "0x75173e74191063512b455445f3a7cb096d9fe62ac07ca671cf63a7cf4f9e0b80765d24138acd504ca42d51469a80c81cc82c25e4949b279c1389db9a944524601b",
    "signer": "0x0223D99aABF087EBEa2Dd55DfAfa73744E3c53Dc",
    "userId": "71843603"
  }
}