{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x663dd6079e6a8b93903d1bf98e957949a3e9b35566db7d91a30a1e6146cda170",
    "signature": "0xabd0bbc8aa70dfb4b79630b201aa6065d3a5932c4d1f1495612d5609c12cc70c4fc13486f4e2829f9d6898929d4956ece819376572912c9edee7ea3fda35b9201b",
    "signer": "0x9B8d44671FCca15eF472F4e525D2dE4C5cE370de",
    "userId": "709092909"
  }
}