{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x3211ee92e54b9d384a7befdddfa6491802249e92ccef71f00d9b5a76bbc99248",
    "signature": "0x3b931478d6d3166f56c531e61995b146e312a12ff1c5cf1d35f328d3276ea34b67943c909b8599fde0c3106129dceba6f89f30e55d4ff6754ff100aafb7fff911b",
    "signer": "0x17377E4Fa094Eb9e41fa2D81D3dD9E9558561A4a",
    "userId": "879475605"
  }
}