Researchers' Shielded Bitcoin (BTC) Design Sizes Private Transfers at 700 Bytes

Shielded Bitcoin (BTC) Proposal

A team of cryptographers has put forward a design for private Bitcoin (BTC) payments that would hide amounts, senders and recipients without altering the base layer's proof-of-work consensus. The 56-page Shielded Bitcoin (BTC) specification, published Thursday by Clara Shikhelman, Mikhail Komarov and Aleksei Moskvin of cryptography firm [alloc] init, adapts the shielded-payment architecture behind Zcash: value sits in encrypted records called notes, and spending one publishes a marker plus a mathematical proof that the sender owned the funds and created no new supply. Unlike Zcash, which verifies such proofs itself, the proposal stores transfer data on Bitcoin and leaves verification to separate software anyone can run — so a base-layer confirmation could land even when the private payment inside it fails its own checks. The authors estimate a private transfer at roughly 700 virtual bytes versus 100-200 for a normal transaction, about four times the miner fee at an equal fee rate. No deposit or withdrawal mechanism exists yet — that is reserved for a follow-up paper using PIPEs, a technique to lock a Bitcoin signing key until set conditions are met — meaning users would effectively hold wrapped or synthetic bitcoin in the interim. There is no launch date as of Friday.

Bitget's $387.5M Hot-Wallet Breach

Custody risk resurfaced hours after the paper appeared. Bitget's security systems flagged unauthorized transfers from a subset of hot wallets at 02:31 UTC+8 on September 25, and the exchange's official updates now put the drained total at roughly $387.5 million — revised up from an initial $351.6 million estimate after previously uncounted Zcash and TRON assets were added, not because of fresh theft. Attackers compromised the wallet service's backend, forged transfer instructions and triggered the authorized signing flow; private-key leakage has been ruled out, and cold wallets were untouched. Withdrawals stay paused while deposits and trading run normally, and balances are covered by a protection fund the exchange sizes above $464 million, backed by more than $1 billion of its own capital. Mandiant and SlowMist lead the investigation, a 5% bounty is offered for frozen or recovered funds, and a withdrawal-resumption plan was due by 12:00 Beijing time on September 26. On-chain tracing has already linked stolen XRP to July's $24 million AFX hack, attributed to TraderTraitor, pointing investigators toward Lazarus Group. As our best crypto exchanges guide stresses, platform custody remains a counterparty decision users should weigh deliberately.

BTC Steady Near $84,000

Price action stayed muted through all of this. Bitcoin (BTC) changed hands near $83,924, down 0.33%, as of 13:00 Korea time on September 26, with 24-hour volume near $32.45 billion, down 11.71% — both sides of the book pulled back. The five-session tape shows four small down days out of five, yet daily and weekly MACD readings remain positive, so the medium-term trend has not flipped bearish. Under the surface, participation improved: active wallets rose to 671,438 from 638,874 a day earlier, and exchanges recorded net outflows of 7,407 BTC versus 3,632 the prior session, easing near-term sell pressure. Fear and Greed printed 74, up from 71, even as Google Trends interest cooled to 39 from 58. SOPR at 1.0076 shows sellers still realizing only modest profits. The weekly picture is stronger: BTC/JPY closed the September 13-19 week up 7.08% at ¥12,714,550 per SBI VC Trade's weekly market report, after a short squeeze followed the Fed and Senate event gauntlet. Positioning trackers matter here too — CoinMarketCap's acquisition of Coinglass consolidated Bitcoin derivatives data from 28 exchanges — and our Bitcoin market coverage tracks those flows daily.

CLARITY Stalls, Fed Hikes

The week's risk-off start and sharp rebound trace back to Washington. On September 15 the Senate fell 49-50 short of the 60 votes needed to bring the CLARITY Act — a comprehensive digital-asset market-structure bill — into full-chamber debate; Democratic senators opposed unanimously, with the fight centering on ethics language that excluded businesses tied to the president's children, including World Liberty Financial. Bitcoin (BTC) slid to near $75,000 around the vote before buyers returned. The bill is not dead: a reconsideration motion is on file and some lawmakers eye a post-midterm lame-duck session, but most market participants now expect passage to slip to the 2027 Congress. In the vacuum, regulators acted alone: the SEC released a five-year innovation exemption on September 17 for on-chain trading of tokenized equities, and its Regulation Crypto Assets proposal stays open for comment until October 20 — while the CFTC's stance is detailed in our FAQ on tokenized customer funds. The FOMC then delivered a widely expected 25-basis-point hike to 3.75-4.00% on a unanimous 12-0 vote, with 16 of 19 policymakers projecting at least one more increase this year, clearing the event calendar and fueling the recovery rally. Readers tracking the market in real time can follow live spot and futures prices on Binance.

Privacy Is Now the Battleground

(as of 12:44 UTC) COINOTAG's read: the technical picture still points higher, though overhead resistance is light. The strongest resistance sits at $95,445.6406 — scored 38/100 by the composite engine off Fibo 1.272 — with spot at $85,008.0000, where BTC is up 1.14% over 24 hours, just below a lighter cap at $85,946.2565 (16/100, Keltner Upper); further Fibonacci-based caps stack at $99,648.1987 (34/100, Fibo 1.414), $105,685.6766 (34/100, Fibo 1.618) and $102,193.4100 (32/100, Fibo 1.500). Support stacks at $81,464.1251 (68/100, Ichimoku Kijun, Fibo 0.214, BB Middle, SMA 20), $84,084.2951 (65/100, Ichimoku Tenkan, S2, Fibo 0.114), $76,969.6197 (55/100, SMA 50, Fibo 0.382, EMA 50, Keltner Lower), $78,686.8500 (47/100, LVN, Supertrend, HVN) and $72,597.9300 (47/100, EMA 200, SMA 200, HVN, SMA 100). RSI at 66.27, a bullish MACD signal and an uptrend classification align with derivatives data: funding at 0.0043%, open interest of $16.09 billion and a long/short account ratio of 1.32 (56.9% long / 43.1% short) show positioning tilted long without overheating. Sentiment at 70/100 (Greed) supports the bid, and BTC's 3.3% share of COINOTAG's $51.79 trillion tracked universe reflects the breadth of the market it anchors. If $84,084.2951 holds as support, the path of least resistance is a run at $85,946.2565 and, beyond it, $95,445.6406; losing it opens $81,464.1251.