{
  "manageEntity": {
    "action": "Update",
    "entityId": "162888568",
    "entityType": "Playlist",
    "metadata": "{\"cid\":\"\",\"data\":{\"playlist_contents\":[{\"timestamp\":1786869518,\"track_id\":2073066082},{\"timestamp\":1786869518,\"track_id\":791077015}]}}",
    "nonce": "1786869518341330203",
    "signature": "0x54bab5763363ce4363efd4e79694b752855523bff39754d0dd42ce224be203a1682d99723eb87456bcda7130f5922e7a82f138b542583614e5d0a223522ed3511b",
    "signer": "0x922cb2AE695da9f7Dd0e556954c23eeeb8bfFe0E",
    "userId": "550521608"
  }
}