{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xe1e27b297ab252531808d80f0e46637e9469d876c9ceb76219befb52fb1c7a94",
    "signature": "0xda9e68a456ff27d4db8ad1558b5758f9cf456e068f5b7e0e2fb214f7db54c7640e7d30b95500aad4f7e96b6ca01cf0a09765b6e5cc6faf4169682b7a99e97e671b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}