Calculate the avg time of last NBLOCKS bitcoin block in your full node

bitcoin-avg-blocktime.sh

#!/bin/bash
# copyright 2024 st3b1t
# Calculate the avg time of last NBLOCKS

NBLOCKS=10
#pick last NBLOCKS blocks

PREV_TIMESTAMP=0
DIFF_SUM=0
COUNT=0

CURRENT_HEIGHT=$(bitcoin-cli getblockcount)

# Itera sugli ultimi NUM_BLOCKS blocchi per calcolare la differenza di tempo
for (( i = CURRENT_HEIGHT - NBLOCKS + 1; i <= CURRENT_HEIGHT; i++ ))
do
  # Ottieni l'hash del blocco all'altezza i
  BLOCKHASH=$(bitcoin-cli getblockhash $i)
  
  # Ottieni il timestamp del blocco tramite l'hash
  TIMESTAMP=$(bitcoin-cli getblock $BLOCKHASH | jq -r '.time')
  
  # Calcola la differenza di tempo solo se non è il primo ciclo
  if [ $PREV_TIMESTAMP -ne 0 ]; then
    DIFF=$((TIMESTAMP - PREV_TIMESTAMP))
    DIFF_SUM=$((DIFF_SUM + DIFF))
    ((COUNT++))
  fi
  
  PREV_TIMESTAMP=$TIMESTAMP
done

if [ $COUNT -gt 0 ]; then
  AVG_DIFF=$((DIFF_SUM / COUNT)) #seconds
  AVG_MIN=$(((AVG_DIFF + 30) / 60)) #minutes
  echo "AVG Block Time: $AVG_MIN minutes"
fi