minecraft-packets/minecraft-packets/data/pc/1.15.2/from-server/multi_block_change/1.json

An easy way to query PrismarineJS/minecraft-packets

{
  "chunkX": -1,
  "chunkZ": -6,
  "records": [
    {
      "horizontalPos": 133,
      "y": 38,
      "blockId": 35
    },
    {
      "horizontalPos": 116,
      "y": 38,
      "blockId": 35
    }
  ]
}