PCoin v1.3.0 — pool mining

PCoin v1.3.0 — pool mining

This is the release that makes joining a pool one line. startpoolmining is
now in the binaries people actually download; before this it existed only in
source, so any node following the instructions answered Method not found.

Mine for a pool

# Linux
sudo pcoin-cli -datadir=/var/lib/pcoin \
    startpoolmining "pool.pc.am:3333" "<your pc1... address>" 0

# Windows
C:\PCoin\bitcoin-cli.exe -datadir=C:\PCoin\data ^
    startpoolmining "pool.pc.am:3333" "<your pc1... address>" 0

0 threads means every core. The address is your identity at the pool — it is
where you get paid, and no wallet or private key is involved on your machine.

To make it survive a restart, set POOL_URL=pool.pc.am:3333 in
/etc/pcoin/miner.conf (Linux) or poolurl=pool.pc.am:3333 in
C:\PCoin\pcoin-tray.cfg (Windows). Without that, the supervisor and the tray
re-issue solo mining at the next restart and your payouts move back to your
own address.

Solo mining is unchanged. startmining still works exactly as before.

Notes

• Pool mining does not need a synced node. The pool supplies the block being
  worked on, so a fresh install contributes immediately. (Solo mining still
  waits, because an unsynced solo miner builds a competing fork.)
• pool.pc.am is invite-only right now while its payout accounting is
  reconciled against the chain. A stranger gets a clean refusal, not silence.
• The .deb now declares libc6 (>= 2.38), read from the binary. It previously
  claimed 2.31 while requiring 2.38 — installing cleanly and then failing to
  start on every boot.
• Requires glibc 2.38+ (Ubuntu 24.04+, Debian 13+).

Verify

sha256sum -c SHA256SUMS