{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x793ef7367ac86ab6983759745182ff8a5b4d41b58486edb7cd59512afa4b9160",
    "signature": "0xda0d425a2144f490e82a90a76b106306913bd707bf98b8aa59e5dea7525eeffa7a1edaeb9294fd182a0ec4aeb8c9dd1d430b4b5b93ad1ff46c24d2c990d5a0181b",
    "signer": "0x216E3DcB84F1654f711041294908a8f8ADb25766",
    "userId": "643512122"
  }
}