As per stackoverflow.com/a/52351480/895245 our standard test setup is:
while true; do
  resp=$"$(date): hello\n"
  len="$(printf '%s' "$resp" | wc -c)"
  printf "HTTP/1.1 200 OK\r\nContent-Length: $len\r\n\r\n${resp}\n" | nc -Nl 8000
done
They might have shut down, but they still have the cutest name! And they've made some cute inscriptions too, see: HHTT
Coinbase transaction by Ciro Santilli 37 Updated 2025-07-16
The first transaction of each Bitcoin block is called the "coinbase transaction", and it is magic as it does not need to point to a previous output script and have a valid input script as it serves as a Block reward for miners.

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