#BIP148 (Segwit USAF) was published on March 12, 2017. It defined no miner signalling bit and no threshold mechanism. Therefore, hashrate signalling for BIP148 itself was 0% (ZERO) for its entire lifetime. It was enforced only by nodes. In the weeks leading up to August 1, 2017: • June 24, 2017: 918 BIP148 nodes out of 7,441 reachable nodes (~12.3%) • Late July 2017: 1,095 BIP148 nodes out of 7,896 reachable nodes (~13.9%) So economic-node enforcement support was roughly 12–14% of publicly reachable nodes before the flag day. Now the miner side. BIP91 was proposed by James Hilliard in July 2017 as a MASF under the SegWit framework. It used version bit 4 and required 80% signalling over a 336-block window to lock in. Timeline for BIP91 hashrate signalling: • Around July 17–19, 2017: signalling for bit 4 began rapidly increasing. • July 20, 2017: BIP91 crossed the 80% threshold within a 336-block period and locked in. • July 21, 2017: BIP91 activated. • Within days, effectively ~100% of blocks were signalling bit 1 (SegWit) because BIP91 nodes began rejecting non-signalling blocks. At lock-in, signalling was just above the required 80% threshold (roughly 80–85% depending on the exact 336-block sample window). After activation, signalling for bit 4 and bit 1 rapidly converged toward near-total miner compliance, because non-signalling blocks risked being orphaned. So the combined factual statement is: From March through mid-July 2017, hashrate signalling for BIP148 was 0%. During late June to late July, roughly 12–14% of publicly reachable full nodes were enforcing BIP148. In mid-July, BIP91 achieved ~80% hashrate signalling over a 336-block window (locking in July 20, activating July 21, 2017), after which miner signalling for SegWit (bit 1) rose to near-total compliance ahead of the August 1 BIP148 enforcement date. Precise citations: 1. BIP148 specification and publication date — https://bips.xyz/148 2. Bitnodes snapshot (June 24, 2017): 918 / 7,441 — https://www.bitcoininsider.org/article/2380/scheduled-scaling-updates-bitcoin-network-are-getting-closer 3. Bitnodes snapshot (late July 2017): 1,095 / 7,896 — https://www.bitcoininsider.org/article/2954/august-1-and-potential-disruption-bitcoin-network 4. BIP91 activation and 80% threshold timeline — https://www.nasdaq.com/articles/bip-91-has-activated.-heres-what-that-means-and-what-it-does-not-2017-07-20 The structural lesson is stark: ~13% of visible nodes credibly threatening enforcement was enough to force ~80% of hashrate into coordinated compliance.