{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x6e9749efe8efc7a304f934bb6accbc45d93a0a9b792b17ade3816f5c09624417",
    "signature": "0x6ad308fa1fd7a9a3c5814f19071fc361db08b9ca4b5229fa5f7fc9fcec1e5cc57468d22feefc57fdeb0a1bcc46041abce1a3f3656e3f233b1e768a416ee7943b1c",
    "signer": "0xaDC9D4604F02A3d510468234256a0815f96F0D3C",
    "userId": "198890948"
  }
}