Retrospective Documentation

Reconstruct Crypto Records Retrospectively

Traded crypto for years but never documented it? TX-Partner reconstructs the history as far back as the sources allow, in one case to 2013.

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30 minutes · Consultation and quote free

9years Together in crypto accounting
Fixed price Cost certainty upfront
Independent Not tied to any tool
Robert Thorn Johannes Anderl

Robert & Johannes · personally review your data

Typical Scenarios

Reconstructing Crypto Records: When It Becomes Necessary

Blockchain data is permanent. TX-Partner reconstructs crypto histories years later, from on-chain data, exports and archives.

01_TRACEABLE

Can crypto transactions be tracked?

Yes. Wallet addresses are public and permanent, exchanges know you through KYC, and since 2026 EU crypto service providers record automatically (DAC8). First reports in 2027.

02_YEARS_MISSED

Years undocumented – crypto undocumented for years

Trading since 2017 or 2019 but never used a tax tool? TX-Partner reconstructs the entire history.

03_EXCHANGE_CLOSED

Exchange closed or hacked – exchange no longer available

FTX, Celsius or other platforms gone? TX-Partner works with on-chain data and archived sources.

How dead exchanges are handled 04_DEFI_UNLABELED

DeFi never recorded – DeFi activity never documented

Liquidity pools, yield farming, bridges: all on-chain, none of it in the tax tool. TX-Partner catches up.

How DeFi history is rebuilt
05_TAX_INQUIRY

Tax authority inquiry – received an inquiry from the tax authority

Letter from the tax authority? TX-Partner builds the retrospective crypto accounting as a reliable basis for your response.

06_MESSY_DATA

Chaotic data situation

Dozens of wallets, several exchanges, no overview? TX-Partner brings structure into it and documents everything traceably.

Typical Hurdles

Reconstructing crypto records yourself: where most people fail

A backlog of several years can be solved, but the effort grows with every year. Four points where doing it yourself usually breaks.

Exchange exports are not enough

CSV exports are often incomplete. Staking rewards are missing, and closed exchanges only deliver through a GDPR request to the insolvency administrator.

DeFi is a blind spot

DeFi protocols usually offer no export. Every transaction has to be researched on-chain, interpreted and classified.

The time needed is underestimated

Catching up three years means every chain on its own, every exchange on its own, every bridge with both sides. DeFi across chains even more so.

Errors compound

One wrong transaction in 2021 distorts the cost basis through 2026. The chronology has to hold from the start.

What TX-Partner makes of it

The gap is closed, not bridged.

01

Reconstructed, not patched

TX-Partner reconstructs what really happened on-chain. A lump-sum adjustment does not make the assignment correct, only invisible.

02

Fixed price after the analysis

TX-Partner looks at the data first, then you know the costs, before you place the order. No hourly rate, one fixed price for the quote.

03

Ready to file

One data set for three recipients: tax report, proof of funds, DAC8 reconciliation.

See services and fixed price
From Practice

When Your Crypto History is Missing

Three clients, three gaps in the history. How much of it could be reconstructed.

“I have been in crypto since 2017 and honestly never documented anything. TX-Partner looked at it and gave me a clear overview of what needs to be done and how to approach it.”
M. E.
“I was skeptical whether anyone could really handle my DeFi transactions. Liquidity Pools, bridges across multiple chains. They actually know their stuff.”
T. P.
“I did not know exactly where I stood. TX-Partner reviewed my data and explained clearly where I am and what to watch out for.”
FPZ

Genuine client reviews, collected via Trustpilot, LinkedIn and direct feedback after each project.

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Crypto records retroactively reconstruct.

30 minutes that make the difference.

Book a consultation 30 minutes · Consultation and quote free

If we are not the right fit for your case, we will say so in the call.

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DAC8 & Crypto Accounting

From 2026, exchanges report automatically. What this means for undocumented crypto histories and why catching up is becoming more urgent.

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Reconstruct Crypto History

Step-by-step practice guide: how to systematically rebuild missing data from on-chain sources, old exports, and wallet logs.

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When the Tax Tool Isn't Enough

When Blockpit or CoinTracking shows errors that can't be resolved, it takes more than a tool.

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Common Questions

Before the first call

That's exactly the standard case for retrospective documentation. TX-Partner reconstructs via on-chain forensics (Etherscan, Solscan, Bitquery), archived exchange snapshots and bridge logs. Even if you only roughly remember which wallets or exchanges you used, that's usually enough as a starting point. More: When the Tax Tool Isn't Enough.
Closed exchanges no longer offer API access. What remains: a data subject access request (DSAR, Art. 15 GDPR) to the exchange or the insolvency administrator, plus the on-chain deposits and withdrawals of the exchange addresses. Trades inside the exchange are off-chain and cannot be reconstructed without that data. Details: Reconstruct Exchange History.
On-chain to the genesis block of each chain (Bitcoin 2009, Ethereum 2015, etc.). For centralised exchanges it depends on available archives. Generally: on-chain movements can be traced when the wallet addresses are known. Trades inside an exchange only with the exchange data. More in the blog article on reconstructing crypto history.
It depends on scope: number of sources (wallets, exchanges, chains), time period, complexity (Buy & Hold vs. DeFi). In the free consultation, TX-Partner reviews your situation and gives you an honest upfront assessment. No hidden costs.
In the free consultation (30 min), Robert or Johannes personally reviews your data situation: what's still there, what's missing, how far back can be reconstructed, and what it would cost. If TX-Partner is not the right fit for your case, we will say so in the call.
Usually two to six weeks, depending on scope. History reconstruction is more involved than standard documentation because on-chain forensics is manual work. For urgent cases (tax deadline, bank inquiry) there is the option to expedite. Mention it directly in the consultation.
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