Crypto from mining, staking or airdrops has no purchase receipt, so its origin is proven by documenting the activity that generated it: hardware and electricity invoices and pool payout records for mining, reward histories and validator or delegation addresses for staking, and the eligibility and claim transactions for airdrops. Each reward is then traced on-chain from the address where it arrived to the wallet that now sends to the bank. Banks often also ask whether these rewards were declared for tax, and the treatment differs by country.
Mining
Mining is an economic activity with costs and output, and both should be documented:
- Purchase invoices for mining hardware and, if used, hosting contracts.
- Electricity bills showing consumption consistent with the equipment.
- Pool account statements and the payout addresses configured.
- On-chain payouts from the pool, or block rewards for solo mining.
- Company records and accounts, if mining was run as a business.
Staking
For staking on an exchange, the platform's reward history and account statements are the main evidence. For native staking, the analyst identifies the validator or delegation addresses and the reward events on-chain. Liquid staking tokens add a step: the deposit, the token received and its later redemption or sale must all be reconciled.
Rewards received in many small amounts over time are usually grouped in the report by period and source, with the full list of transactions in an annex, so the bank sees both the overview and the detail.
Airdrops and forks
An airdrop is documented by showing why the address was eligible (the earlier activity or holding at the snapshot), the claim or receipt transaction and the token contract. Unsolicited tokens sent to many addresses can be linked to scams; they should be identified and, if never used, set aside rather than sold into the bank transfer. Coins from chain forks follow the documentation of the original holding.
Tax treatment
Many tax authorities treat mining and staking rewards as income when they are received, and a later sale or exchange as a separate taxable event, but the rules on timing, valuation and airdrops differ from country to country and change over time. A bank will not give tax advice, but it will ask whether the income was declared where you are tax resident, so it helps to have the answer, and the tax returns that support it, ready.
How Advisorn helps
Advisorn reconciles payouts and rewards on-chain with your operating records and signs a report the bank can verify. We also answer the bank's follow-up questions on the activity.
Updated November 2026 · General information, not legal or tax advice on your specific case.