{
  "manageEntity": {
    "action": "Update",
    "entityId": "1560605938",
    "entityType": "Playlist",
    "metadata": "{\"cid\":\"\",\"data\":{\"playlist_contents\":[{\"timestamp\":1790358456,\"track_id\":436049021},{\"timestamp\":1790358456,\"track_id\":1920936003},{\"timestamp\":1790358456,\"track_id\":1338594735},{\"timestamp\":1790358456,\"track_id\":219363},{\"timestamp\":1790358456,\"track_id\":398353998}]}}",
    "nonce": "1790358456644633592",
    "signature": "0x956a7ff5959d3458e3ccd1c6128c553af62ada5d595963c32e531d78fcee862061a60bf0762dbe8960095337baa9c93c4abf33b11557eecfec229c270b6f44881b",
    "signer": "0x922cb2AE695da9f7Dd0e556954c23eeeb8bfFe0E",
    "userId": "878387381"
  }
}