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Crypto Law/Level IX · Death, divorce and disputes/9.2 Family and money disputes/Lesson 2

Hidden crypto and how it is found

Why crypto looks easy to hide in divorce and other disputes, the paper and on-chain trails that usually expose it, and the remedies courts impose when concealment comes to light.

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. Full, early disclosure is the cheapest route: California Family Code §1101(g) and (h) award 50% or 100% of an undisclosed asset, valued at its highest relevant value, and §2107(d) requires setting aside a judgment obtained without proper disclosure.
  2. Gather free evidence before paying anyone: IRS transcripts cost nothing, covering return transcripts for the current and three prior years and wage-and-income transcripts for the current and nine prior years.
  3. Use formal discovery and subpoenas to exchanges in the existing case before hiring a forensic tracer; pay for expert tracing only where the suspected amount justifies the fee, and never accuse without evidence.
  4. A holder who left crypto off a past return can correct it with Form 1040-X before it is found; correcting the tax return does not cure non-disclosure in the divorce case.
  5. In England and Wales, Sharland v Sharland [2015] UKSC 60 lets a deceived party reopen a consent order unless the deceiver shows the deception made no difference, so concealment rarely saves money.

MaterialsCalifornia Family Code §1101 (remedies for undisclosed assets) and §2107 (failures of disclosure)Several years of tax returns, including the digital-asset question on US Form 1040Bank and card statements showing transfers to or from exchangesA block explorer, for following an address once one is known

Wonder

  1. Can someone really hide crypto from a spouse, a creditor or a court?
  2. Which records point to crypto that was never disclosed?
  3. What happens to someone who is caught hiding it?

Explore

  1. Crypto looks easy to hide: it needs no bank account, a recovery phrase can be memorised, and coins can cross borders in minutes. In practice most concealed holdings leave traces, because money has to get in and usually has to get out. Disclosure duties apply in divorce (lesson 9.2.1), bankruptcy (lesson 9.2.3) and the enforcement of judgments (lesson 9.2.4), and in each the legal cost of being caught concealing usually far exceeds the value hidden. This lesson explains how concealment is uncovered, as a matter of evidence and remedies. It is neither a guide to hiding assets nor a basis for accusing anyone without proof.
  2. The first trail is ordinary paperwork. US Form 1040 asks every filer whether, during the year, they received a digital asset as a reward, award or payment for property or services, or sold, exchanged or otherwise disposed of a digital asset. A ‘yes’ on a past return, or crypto sales on a capital gains schedule, points to holdings. Custodial brokers report gross proceeds on Form 1099-DA for transactions on or after 1 January 2025 (lesson 2.3.5). Bank and card statements show transfers to exchanges, and exchanges keep identity and transaction records that a subpoena issued in the case can reach (lesson 4.3.3).
  3. The second trail is the blockchain. Most public blockchains record every transfer permanently, so once one address is linked to a person, for instance a withdrawal address on an exchange statement, an analyst can follow the funds forwards and backwards (lesson 1.1.5). Forensic accountants combine this with device evidence, emails confirming purchases, receipts for hardware wallets and installed wallet apps or browser extensions. Mixers, privacy coins and cross-chain bridges make tracing harder but not impossible, and using them during a dispute can itself look like concealment to a court. The methods, and how courts weigh such evidence, are covered in lesson 9.3.4.
  4. California shows how severe the remedies can be. Under Family Code §1101(g), the remedies for a spouse’s breach of fiduciary duty include an award to the other spouse of 50 percent of any asset undisclosed or transferred in breach, plus attorney’s fees and court costs. The asset is valued at its highest value at the date of the breach, the date of its sale or disposition, or the date of the award. Where the breach falls within Civil Code §3294, which covers oppression, fraud or malice, §1101(h) allows an award of 100 percent of the undisclosed asset. For a volatile coin, the ‘highest value’ rule can produce a figure far above its value at separation.
  5. Concealment can also reopen a finished case. California Family Code §2107(c) requires money sanctions against a party who fails to comply with the disclosure rules, and §2107(d) requires the court to set aside a judgment entered when the parties failed to comply, adding that the failure is not harmless error; narrower limits apply where disclosure was waived. In England and Wales, the Supreme Court in Sharland v Sharland [2015] UKSC 60, decided on 14 October 2015, held that where a financial order was agreed on the basis of fraudulent non-disclosure, the person who deceived must show that the deception would not have influenced the agreement or the order.
  6. Other consequences can follow outside family court. Hiding assets from a bankruptcy trustee is a federal crime (lesson 9.2.3), and moving them away from a creditor can be undone (lesson 9.2.4). For someone who suspects concealment, the practical step is to gather what already exists before making any accusation: past tax returns, statements showing transfers to exchanges, and any known addresses, and then to raise them through formal discovery with a lawyer. For someone who holds crypto, the reverse check applies: a complete and dated list, disclosed early, avoids the much larger remedies that follow when undisclosed holdings are found.

Key facts

  • US Form 1040 asks whether, during the year, the filer received a digital asset as a reward, award or payment, or sold, exchanged or otherwise disposed of one.
  • Brokers report gross proceeds of digital asset sales on Form 1099-DA for transactions on or after 1 January 2025.
  • California Family Code §1101(g) allows an award of 50 percent of an asset undisclosed in breach of fiduciary duty, valued at its highest value at the breach, the disposition or the award.
  • California Family Code §1101(h) allows an award of 100 percent of an undisclosed asset where the breach involves oppression, fraud or malice under Civil Code §3294.
  • California Family Code §2107(d) requires a court to set aside a judgment entered when the parties failed to comply with the disclosure rules, which is not harmless error.
  • In Sharland v Sharland [2015] UKSC 60, decided on 14 October 2015, the UK Supreme Court set aside a consent order obtained by fraudulent non-disclosure.

Exercise nine, six, three, one

9CollectList up to 9 records that would show whether a person has held crypto, such as tax returns, bank statements, exchange emails, device apps or known addresses.
6ClusterSort them into 6 kinds: tax filings, bank and card records, exchange records, on-chain data, device evidence, and statements by the person or witnesses.
3DistillReduce the 6 to 3 by keeping the kinds that are easiest to obtain lawfully and hardest to alter or explain away.
1CrystallizeWrite 1 sentence describing the single record that would most quickly confirm or rule out undisclosed crypto in a case you know or can imagine.

Fact check

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

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