BIP-360 Goes Live on Bitcoin Testnet

BTQ Technologies launched Bitcoin Quantum testnet v0.3.0 on March 19, 2026, the first working implementation of BIP-360 (Pay-to-Merkle-Root, P2MR), with 50+ miners and 100,000+ blocks. P2MR was merged into Bitcoin's BIP repository on February 11, 2026.

What it fixes is narrow. P2MR removes Taproot's key-path so a public key is no longer written on-chain, but only for new addresses, and only against At-Rest attacks (harvesting keys that already sit permanent on-chain, with no time pressure). The key still appears in the mempool on every spend, so On-Spend exposure is untouched, left to a future post-quantum-signature proposal.

And that is the easy part. P2MR does nothing for the ~$470 billion already in exposed addresses (all P2PK, all Taproot, every reused address), and migrating the rest is its own ordeal: Bitcoin's ~190 million UTXOs, at the chain's ceiling of ~7 transactions per second, would take roughly a year of blocks doing nothing but migration, multi-year in practice, and each migration spend briefly re-exposes the very key it is trying to protect. BIP-360 has no mainnet activation date, and SegWit and Taproot each took 7 to 8 years to adopt.