minecraft-packets/minecraft-packets/data/pc/1.14.4/from-server/multi_block_change/1.json

An easy way to query PrismarineJS/minecraft-packets

{
  "chunkX": -1,
  "chunkZ": 14,
  "records": [
    {
      "horizontalPos": 97,
      "y": 39,
      "blockId": 35
    },
    {
      "horizontalPos": 103,
      "y": 19,
      "blockId": 36
    }
  ]
}