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Crypto Law/Level IV · Holders' traps/4.1 Custody/Lesson 1

Not your keys: what an exchange account really is

A balance on an exchange is a promise recorded in a company’s books, and its value in a collapse depends on the contract you accepted and on bankruptcy law.

Education, not legal, tax or investment advice. Crypto law differs between countries and states and changes often. Check the current rules where you live with a qualified lawyer or tax adviser before you act.

The lean path

The cheapest, lowest-tax, simplest and most private route the law allows, best first. Each step names the rule it rests on and the condition that keeps it lawful.

  1. Zero-cost first: withdraw long-term holdings to a wallet whose keys you hold (FinCEN FIN-2019-G001 treats single-signature unhosted value as the owner’s property); US transfers between your own wallets are not taxable, but keep the cost-basis records.
  2. Keep only trading balances on platforms whose terms say title stays with you and assets are not lent, such as financial-asset treatment under UCC Article 8 (§8-503); a secured creditor with control can still rank ahead (§8-511).
  3. Free insurance-gap check: FDIC covers only deposits at insured banks and SIPC excludes unregistered digital assets, so no fee-free safety net exists for coins held by a crypto company; any private policy covers only its named events.
  4. Save dated copies of the terms and monthly statements outside the platform at no cost; in a failure they prove a custodial (§541(d)) or creditor claim, filed free on Official Form 410 by the court’s bar date.

MaterialsThe user agreement of any platform where you hold crypto, open at the sections on custody, title and insolvency11 U.S.C. §541, which defines what becomes property of a bankruptcy estate (law.cornell.edu)UCC §8-503, the rule that protects assets a securities intermediary holds for its customersYour latest account statement, downloaded and saved outside the platform

Wonder

  1. If the exchange shows 1 bitcoin in my account, do I actually own a bitcoin?
  2. What happens to my balance if the exchange goes bankrupt?
  3. Is crypto on an exchange insured the way a bank deposit is?

Explore

  1. A private key is the secret that lets someone move coins on a blockchain. When you buy crypto on an exchange, the exchange usually keeps the keys and often holds many customers’ coins together in pooled wallets. What you see is an entry in the company’s own ledger. That makes the exchange a custodian: a business that holds assets for someone else. The slogan ‘not your keys, not your coins’ points at this gap. Legally, your account is a contract with a company, and what you own depends on what that contract and the applicable law say.
  2. The question that matters arrives when a platform fails. In the US, a bankruptcy estate includes ‘all legal or equitable interests of the debtor in property’ (11 U.S.C. §541(a)(1)). Section 541(d) adds that where the debtor holds only legal title and not the equitable, or beneficial, interest, the estate takes only that bare title. So coins a platform holds purely as custodian for you may stay outside the pot shared among creditors. Coins the platform owns, even if it owes you an equal amount, go into the pot, and you become an unsecured creditor (lesson 4.1.4).
  3. Platforms have said this plainly. In its quarterly report filed on 10 May 2022, Coinbase warned that because custodially held crypto assets ‘may be considered to be the property of a bankruptcy estate’, customers ‘could be treated as our general unsecured creditors’. Its current US user agreement takes a firmer position: title to supported digital assets ‘shall at all times remain with you’, the assets are ‘not property of Coinbase’, and they are treated as ‘financial assets’ under Division 8 of the California Uniform Commercial Code, with Coinbase acting as a ‘securities intermediary’. Other platforms’ terms differ, sometimes sharply.
  4. Article 8 of the Uniform Commercial Code is the body of state law that governs brokerage-style holdings. Under UCC §8-503(a), to the extent needed to satisfy customers’ entitlements, assets a securities intermediary holds ‘are not property of the securities intermediary, and are not subject to claims of creditors’, except as §8-511 provides. Section 8-511(b) gives priority over customers to a creditor holding a security interest with control of the asset. And no contract term protects coins that are no longer there: at FTX the terms promised customer ownership, yet the assets were missing (lesson 4.1.3).
  5. Two safety nets people assume are mostly absent. The FDIC said in a 29 July 2022 advisory that it ‘only insures deposits held in insured banks and savings associations’; crypto held by a crypto company is not an insured deposit. SIPC, which protects customers of failed US brokerages up to $500,000 including $250,000 cash, says digital assets that are unregistered investment contracts are not ‘securities’ under its statute and are not protected. Separately, the SEC’s Staff Accounting Bulletin 121 of 2022, which made custodians record customers’ crypto as a liability, was rescinded by SAB 122 on 23 January 2025. That changed accounting, not customers’ legal rights.
  6. A practical check: open your platform’s user agreement and search for ‘title’, ‘property’, ‘lend’, ‘rehypothecate’, ‘bankruptcy’, ‘insolvency’ and ‘governing law’. Note whether the terms say the assets remain yours, whether the platform may use or lend them, and which entity and country you contracted with. Save a dated copy of the terms and your balance statements outside the platform, because a frozen account can also mean a frozen website. This lesson explains how the law sorts claims; it does not suggest where to keep your assets, a question lesson 4.1.7 takes up.

Key facts

  • When an exchange holds the private keys, a customer’s balance is an entry in the exchange’s ledger governed by the user agreement.
  • Under 11 U.S.C. §541(d), property in which a debtor holds only legal title and no equitable interest enters the bankruptcy estate only to the extent of that legal title.
  • Coinbase’s quarterly report filed on 10 May 2022 warned that customers could be treated as general unsecured creditors in a bankruptcy.
  • Coinbase’s US user agreement treats supported digital assets as financial assets under Division 8 of the California Uniform Commercial Code.
  • The FDIC stated on 29 July 2022 that it only insures deposits held in insured banks and savings associations.
  • SEC Staff Accounting Bulletin 122, issued on 23 January 2025, rescinded the custody accounting guidance of SAB 121.

Exercise nine, six, three, one

9CollectList up to 9 places where you or someone you know holds crypto through a company rather than with your own keys, such as an exchange, a payment app, a broker or a lending platform.
6ClusterSort them into 6 categories: terms say title stays with the customer, terms transfer title to the platform, terms allow lending of customer assets, terms are silent or unclear, platform regulated in your country, and platform based abroad.
3DistillReduce the 6 categories to 3 groups: likely held for you as custodian, likely a debt the platform owes you, and arrangements you would need to read more closely.
1CrystallizeWrite 1 sentence describing, in your own words, what you would actually hold against your largest platform if it failed tomorrow.

Fact check

Dates, figures and claims checked against the published sources listed below.

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