The debate over whether digital assets belong in client portfolios has largely been settled, according to new research from crypto asset manager 21Shares by FalconX. But the harder question of how to size and structure those allocations is the focus of its new report.
Authored by Eliézer Ndinga, global head of research at 21Shares, alongside senior associates Maximiliaan Michielsen and Matt Mena, the report's central argument is that digital assets have crossed a threshold: they are no longer speculative curiosities but institutional-grade holdings with distinct and definable portfolio roles. The remaining challenge is execution — determining appropriate allocation sizes and building a coherent rationale to present to clients.
The report opens with a statistical argument gaining traction among institutional allocators: long-term correlations between digital assets and traditional investments remain structurally low. Over the three years through June 30, 2026, Bitcoin's average correlation to US equities stood at 38% and was effectively uncorrelated to gold at just 4%, according to 21Shares data drawn from TradingView. Bitcoin, Ethereum, and Solana each registered average correlations of approximately 33% across nine asset classes analyzed, compared with 48% for US equities and 41% for tech equities.
The researchers acknowledge that crypto correlations can spike during acute market stress, but argue this is a short-term phenomenon. For advisors making the case for diversification, that structural differentiation matters even when shorter-term co-movement rises.
Volatility has historically been the most cited barrier to adoption, but the report argues this objection is increasingly dated. Bitcoin's annualized volatility, which averaged above 80% in earlier market cycles, has compressed significantly since the January 2024 launch of US spot Bitcoin ETFs. As of the report's publication, it sat around 30%, with recent periods reaching the low 20s.
The authors of the report, From Theory to Allocation: Managing Digital Assets in Client Portfolios, note that this sits below the volatility of several S&P 500 names already held in many client portfolios — including Tesla at approximately 44% and Palantir at approximately 51%. The implication: if high-volatility equities are permissible within fiduciary practice, a similar standard applied to Bitcoin may be defensible.
One of the more useful sections is the report's taxonomy of digital assets by portfolio function. Treating Bitcoin, Ethereum, and Solana as interchangeable, the authors argue, is an analytical error — each occupies a different sleeve and serves a different purpose.
Bitcoin is framed as a digital reserve asset: a macro diversifier with a fixed supply algorithmically capped at 21 million coins, unconstrained by central bank policy. Its near-zero correlation to gold and low long-run correlation to equities place it alongside hard assets in an alternatives sleeve. Ethereum and Solana belong in the tech equities sleeve as digital infrastructure plays — Ethereum as a core holding within an innovation allocation, Solana as a higher-beta growth satellite for clients with elevated risk tolerance.
Tested within a standard 60/40 portfolio over July 1, 2023 to June 30, 2026, three hypothetical allocations — all funded from the equity sleeve — consistently outperformed the benchmark on a risk-adjusted basis under quarterly rebalancing. The conservative profile added 2% Bitcoin; the moderate added 3% Bitcoin and 1% Ethereum; the growth-oriented added 3% Bitcoin, 1.5% Ethereum, and 0.5% Solana.
The benchmark delivered an annualized return of 8.96%. All three overlays improved that figure, with returns ranging from 9.35% to 10.12%. More notably, total portfolio volatility rose by just 0.02% to 0.41% — confirming that crypto volatility does not scale proportionally when introduced as an appropriately sized sleeve.
The conservative portfolio's maximum drawdown stayed within 0.12% of the benchmark's -13.48%. The report attributes much of this outcome to systematic rebalancing, which the authors call the "rebalancing alpha effect" — converting inherent crypto volatility into portfolio returns through discipline rather than market timing.
The report closes with a practical framework calibrated to risk tolerance. Conservative clients: 1% to 3% Bitcoin only, anchored by its regulated ETF access and institutional track record. Moderate clients: 3% to 4% combined Bitcoin and Ethereum. Growth-oriented clients: 4% to 5% across all three assets, representing over 80% of total crypto market capitalization excluding stablecoins, per CoinGecko data as of June 30, 2026.
The authors are explicit that these are hypothetical illustrations, not investment advice, and that actual allocations should reflect individual client circumstances and regulatory obligations.
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