Banki i płatności
Prove where your crypto wealth came from
Buying years ago and cashing out now means bridging a decade with evidence — only possible if you can show the chain from money to coin and back.
The chain you must show
It starts with legal income: salary, savings, a sale or a gift, then how that money reached a platform and what you bought.
The last link is the payout: which coins were sold, at what price, into which account.
- Source: payslip, statement, deed
- Purchase: orders and deposits
- Custody: addresses or account statements
- Sale and payout: orders and bank receipt
When evidence is missing
Defunct exchanges are a known problem; use old bank statements, email confirmations and on-chain transfers to your own address.
Write a short statement naming the gaps honestly.
Mining, staking and airdrops
Show the source: pool statements, validator addresses or the airdrop contract, with value at receipt.
Record that value immediately; reconstructing later causes disputes.
Maintaining the file
Update quarterly and store it outside the platform with a backup.
A complete file turns a months-long bank review into days.
Najczęstsze pytania
How long should I keep evidence?
As long as you hold the position and at least the statutory retention period afterwards; with crypto, longer is wiser.
What if my exchange no longer exists?
Use bank statements, emails, on-chain transfers and screenshots, and state which documents are missing.
Does a screenshot count as evidence?
Only as support, combined with statements and on-chain data.
Czytaj dalej
Your bank calls about your crypto transactions
Which questions banks ask about crypto transactions, which documents help and how to answer without complicating your file.
When your bank blocks a transfer to a crypto platform
Why banks block transfers to crypto platforms, what rights you have and how to resolve a refused payment properly.
Prowadzenie ewidencji kryptowalut
Jak prowadzić dobrą ewidencję transakcji kryptowalutowych? Eksporty, koszt nabycia i praktyczne narzędzia do rozliczenia podatkowego. To nie porada podatkowa.