curl --request GET \
  --url https://tonapi.io/v2/blockchain/reduced/blocks

{
  "blocks": [
    {
      "workchain_id": 0,
      "shard": "8000000000000000",
      "seqno": 21734019,
      "tx_quantity": 130,
      "utime": 23814011000000,
      "shards_blocks": [
        "[ (0,4234235,8000000000000000) ]"
      ],
      "parent": [
        "[ (0,21734018,8000000000000000) ]"
      ],
      "master_ref": "(-1,4234234,8000000000000000)"
    }
  ]
}

{
  "error": "<string>",
  "error_code": 123
}