TxEcho v0.1.0

First cut of TxEcho.

A tiny Bitcoin P2P monitor that publishes fresh incoming SegWit outputs as flat JSON, bucketed by sha256(scriptPubKey) so wallets can poll for payments without leaking what
Attached:

• txecho-v0.1.0-linux-amd64 — static, single-file binary
• SHA256SUMS — sha256sum -c SHA256SUMS

Reproducible from tag v0.1.0 with the Docker command in the README. Rebuild it.