{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x08441cad1b785985c33e8aeeccadd01efc3e66624256238217ad450e302ad6e8",
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    "signer": "0xd5420857f5870ea432EAe5E7D753F57537111F68",
    "userId": "123190169"
  }
}