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BlackRock BUIDL

B+
Multi-Institution (BNY Mellon + Securitize)Distributed3/4 independence pillarsAccredited Investors & Institutions

BlackRock USD Institutional Digital Liquidity Fund (BUIDL) is the largest tokenized treasury fund with over $2.5B in AUM. The fund invests in US Treasury bills, repurchase agreements, and cash. Securitize serves as the tokenization and transfer agent, while BNY Mellon provides custodial services. BUIDL is deployed across Ethereum, Avalanche, Arbitrum, Optimism, Polygon, Aptos, and Solana.

Visit BlackRock BUIDL
By Steve L, Editorial Lead·Reviewed by Proof of Custody Editorial
·Last updated Mar 2, 2026
80
Custody & SecurityEase of UseFeesFeaturesTransparencySupport
Score Breakdown
Custody & Security35% weight
88
Ease of Use20% weight
65
Fees15% weight
72
Features10% weight
78
Transparency10% weight
85
Support10% weight
78
Assessment
Key Strength

Largest tokenized treasury fund ($2.5B+). BlackRock as asset manager, Securitize as tokenization agent, BNY Mellon as custodian. Daily NAV. Multi-chain deployment across 7 networks.

Primary Risk

Accredited investor requirement. Minimum investment reduced but still institutional-oriented. Smart contract risk on multiple chains. SEC-registered but novel structure.

Pros
  • +BlackRock brand and AUM scale
  • +Multi-institution custody chain
  • +Broadest multi-chain deployment
  • +Daily yield accrual
  • +SEC-registered fund
Cons
  • -Accredited investor requirement
  • -0.50% management fee
  • -Complex redemption process
  • -Smart contract risk across multiple chains
Custody Features
✕Multisig
Multi-Institution
No Single Point of Failure
Segregated Accounts
Proof of Reserves
Insurance
Regulated Custodian
No Physical Exposure
✕Multi-Jurisdiction
✕Inheritance
✕Segregated Insurance
✕IRA
✕Lending
Buy/Sell
✕Dynasty Trusts
Fees
0.50% management fee
Minimum$100K (via Securitize)
Security
Key Management
Institutional custody (BNY Mellon) + Securitize smart contracts
SOC Compliance
SOC 2 Type 2 (Securitize)
Penetration Testing
Regulatory
✓Qualified Custodian
Jurisdiction
United States (BVI fund structure)
Licenses
SEC-Registered Fund, Securitize: SEC Transfer Agent + FINRA Broker-Dealer
Custody Independence Standard
3 of 4 pillars met
Vendor independenceMet
Entropy independenceMet
Control independenceMet
Operational independenceDepends on configuration

2 independent parties or systems must fail before a BlackRock BUIDL holder's bitcoin is at risk.

  • •Keys are generated and held by separate institutions, so vendor and entropy paths do not overlap by construction.
  • •Jurisdictional separation of keyholders is not documented in our data. Confirm with the provider.
How this is assessed →
Insurance

BlackRock BUIDL's custody insurance is not publicly disclosed.

Frequently asked questions
Is BlackRock BUIDL safe?+

BlackRock BUIDL uses a multi-institution (bny mellon + securitize) model and scores 80/100 in our independent review, including 88/100 on custody security. No single institution can unilaterally move funds. Safety depends on your priorities; see the full score breakdown above.

Is my bitcoin insured at BlackRock BUIDL?+

BlackRock BUIDL's custody insurance is not publicly disclosed in a form we can verify. Where it exists, custody insurance covers specific named events up to shared limits and does not cover price loss. Confirm coverage in writing before relying on it.

What happens to my bitcoin if BlackRock BUIDL fails?+

BlackRock BUIDL's architecture distributes control, so no single institution's failure alone can move or lose your bitcoin. Recovery depends on the specific structure; see the custody section above.

Does BlackRock BUIDL support inheritance?+

BlackRock BUIDL does not advertise a dedicated inheritance or beneficiary feature in the data we track. Confirm current options with the provider, since custody inheritance handling changes.

Compare

BlackRock BUIDL vs Others

vs OnrampA
90/100
vs Onramp FinanceA
89/100
vs UnchainedA-
85/100
vs Onramp LendingA-
84/100