# BTC21 — Public Sovereign Bitcoin Infrastructure

> BTC21 is an independent, non-custodial, bare-metal Bitcoin full node and sovereign utility bridge operated as a free public service. It connects corporate treasury analytics with base-layer ledger verification.

## Core Services & Endpoints
- Clearnet Node: btc21.cc:8333
- Tor v3 Onion Node: 2hi75…o7fhfdxtad.onion:8333
- Block Explorer: https://explorer.btc21.cc
- Electrum Service: https://electrum.btc21.cc
- Raw Transaction Broadcaster: https://btc21.cc/#broadcast

## Technical Specifications
- Implementation: Bitcoin Core 31.0
- Chain: Mainnet
- Node Type: Full archival (prune=0, txindex=1)
- P2P Protocol: BIP324 (v2 encrypted transport) enabled
- Filter Support: BIP157 / BIP158 compact filters enabled
- Mempool: 2,000 MB capacity, Full-RBF enabled
- Max Inbound/Outbound Peers: 1,000

## Privacy & Security Policy
- BTC21 collects zero telemetry, uses no ad pixels, sets no tracking cookies, and runs no user analytics.
- Non-Custodial: BTC21 never holds private keys, provides no wallet generation, and manages no user funds.
- Abuse Prevention: Raw transaction relay endpoints are rate-limited via client-side Proof-of-Work anti-spam filters.