zebra/zebra-utils/zebrad-hash-lookup

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#!/usr/bin/env bash
set -euo pipefail
# Reads stdin or the file $1, looks lines up as hashes, then outputs block info
# for each hash. Uses the zcash-cli command for block lookups.
ZCASH_CLI="${ZCASH_CLI:-zcash-cli}"
while read hash; do
header=$($ZCASH_CLI getblockheader "$hash" 2>&1 || true)
if echo "$header" | jq . > /dev/null 2> /dev/null; then
high=$(echo "$header" | jq -r '"\(.height)"')
time=$(echo "$header" | jq -r '"\(.time|todate)"')
prev=$(echo "$header" | jq -r '"\(.previousblockhash)"')
next=$(echo "$header" | jq -r '"\(.nextblockhash)"')
printf 'high: %s\ntime: %s\nhash: %s\nprev: %s\nnext: %s\n' \
"$high" "$time" "$hash" "$prev" "$next"
else
# Handle lookup errors
printf 'hash: %s\n%s\n' \
"$hash" "$header"
fi
done < "${1:-/dev/stdin}"