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Short answer: a downloadable Blur CSV or tax report is not verified in the currently documented interface. Use Blur’s Portfolio and Activity views to identify marketplace events, then build the authoritative record from the wallet addresses and the blockchain explorer for each chain. Save transaction hashes, asset details, proceeds, fees, acquisition evidence and U.S.-dollar values in a durable ledger. This workflow gives you records even when no native export is available, but it does not determine your tax liability.
What you can and cannot export from Blur
The available Blur interface shows navigation for Portfolio and Activity, including activity filters. That confirms a place to review visible marketplace activity, but it does not document a CSV, spreadsheet or tax-report download. Treat any export button you see as a current-interface feature that must be checked at the time you use it, not as a guaranteed Blur capability.
The safest approach is to treat Blur as one view of your activity rather than the complete tax record. A marketplace page may show a sale or purchase while the wallet and chain data contain transfers, approvals, royalties, gas and other events needed to explain the transaction. Your finished file should therefore be a reconciliation of three sources:
- Blur Portfolio and Activity for the marketplace context and collection-level labels.
- Each wallet’s activity for the addresses you controlled or used through Blur.
- The explorer for the blockchain on which each transaction occurred, including detailed transaction and internal-transaction data when available.
This is a record-retrieval method, not a promise that Blur or any tax application will calculate a complete return automatically.
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Prepare a wallet-and-chain inventory first
Do this before copying individual transactions. Missing one address or looking at the wrong chain is the most common reason an NFT history appears incomplete.
- List every wallet address. Include hardware-wallet addresses, browser-wallet accounts, smart-contract wallets and any address you used temporarily for deposits, withdrawals or transfers. Record a human-readable label beside each address, such as “long-term collector” or “trading account.”
- Identify the blockchain for each address and event. Do not assume that all Blur activity is on Ethereum. An address can have activity on more than one chain, and the same NFT collection may exist on different networks.
- Set a date range. Use the period required by your tax return or records policy, plus a small buffer before and after it. Keep the original transaction timestamp rather than relying only on the calendar date shown by a marketplace.
- Preserve ownership evidence. Keep a note showing that each address belonged to you or was controlled by your entity during the period. This helps distinguish your own transfers from unrelated activity visible on a public address.
Make this inventory a separate worksheet or document. It becomes the index for the rest of the collection process.
Use each source for the job it can actually do
| Source | Best use | Important limitation |
|---|---|---|
| Blur Portfolio and Activity | Review visible Blur marketplace events, collection names and activity filters. | The surfaced interface does not document a downloadable export, and marketplace history may not contain every wallet-level event. |
| Wallet activity | Find transactions associated with each address and spot transfers, deposits and withdrawals. | Wallet software can omit internal transactions and may present incomplete fee or contract-event detail. |
| Chain explorer | Verify transaction hashes, timestamps, token movements, value and contract-level events on the relevant network. | An explorer is chain-specific; it will not show activity that happened on another blockchain. |
No single view should be treated as the complete basis history. Acquisition dates and costs may predate Blur, occur in another wallet or come from an exchange or private transfer, so keep those records alongside the Blur-related activity.
Step-by-step: collect the transaction history
1. Review Blur’s Portfolio and Activity pages
- Sign in to Blur with the wallet you are documenting.
- Open Portfolio, then inspect the wallet-level holdings and positions shown for that account.
- Open Activity and apply the available filters for the period, collection or event type.
- Copy or record every visible purchase, sale, bid fill, listing-related event or transfer that belongs in your date range. Include the collection name, token ID when displayed, displayed quantity and any visible price or fee.
- For each row, record the wallet address and chain in your worksheet. If the interface offers a download in your current session, save the original file unchanged and note the date you obtained it. If it does not, continue with the explorer workflow below.
Do not infer that an event is taxable merely because it appears in Activity. Use the page as an index, then verify what actually moved on-chain.
2. Open the correct explorer for each chain
Paste the wallet address or transaction hash into the explorer that serves the relevant blockchain. Examples named in general NFT recordkeeping guidance include Etherscan for Ethereum, BaseScan for Base and Polygonscan for Polygon. These are examples, not a direction to use Ethereum’s explorer for every Blur transaction.
- Search the wallet address for the chosen date range.
- Open each candidate transaction and copy its hash exactly into your ledger.
- Check the transaction status, block timestamp, sender, recipient, native-token value, token transfers and NFT transfer events.
- Open the contract or token details when the collection name is ambiguous. Record the contract address and token ID so that similarly named collections cannot be confused.
- Repeat the search for every wallet and every chain in your inventory.
Explorer timestamps are normally recorded in a time zone or UTC display. Preserve the explorer’s original timestamp and, if you convert it for your records, keep the time zone used for the conversion.
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3. Inspect Ethereum Internal Txns when applicable
For Ethereum sales, open the transaction’s Internal Txns view where the explorer provides one. Internal transactions can reveal payments that a wallet application does not show clearly, including marketplace fees and creator earnings. They are part of the transaction’s payment trail, not separate NFT sales.
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4. Reconcile marketplace rows with on-chain events
Create one ledger row per economically meaningful event, while retaining the hash that proves it. A single NFT sale can produce several token and payment movements, so avoid treating every transfer log as a separate sale.
- Match the Blur event to the explorer transaction hash.
- Confirm that the token contract, token ID and quantity match.
- Confirm the direction of the NFT movement: acquisition, disposal, self-transfer or transfer to another party.
- Reconcile the gross payment with marketplace fees, creator payments, gas and any other documented costs.
- Mark unmatched rows for investigation rather than deleting them.
Keep a status field such as matched, pending review or excluded-with-reason. That audit trail is more useful than silently editing a downloaded file.
5. Add off-chain acquisition and basis evidence
Blur and an explorer can prove what happened on-chain, but they may not establish what you paid originally. For every NFT or fungible digital asset later disposed of, link the acquisition record: an earlier wallet transaction, exchange statement, invoice, gift documentation or other evidence. If you moved the asset between wallets, link the transfer rather than creating a second purchase.
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6. Save an immutable working copy
Export or download explorer pages and any available marketplace files, then save them in a read-only or versioned location. Keep the original filenames, retrieval date and wallet label. Store a separate working spreadsheet for normalization so that the source files remain unaltered.
Fields your tax and recordkeeping ledger should contain
The IRS says taxpayers must maintain sufficient records to establish positions taken on federal returns. A practical ledger can use the following columns; add chain-specific fields when they help you reconcile contracts.
| Field | What to record |
|---|---|
| Wallet label and address | The account name you assigned and the full public address. |
| Blockchain | Ethereum, Base, Polygon or the other network on which the event occurred. |
| Transaction hash | The exact explorer hash, with no truncation in the stored record. |
| Block date and time | The timestamp shown by the explorer, including its time-zone convention. |
| Event type | Purchase, sale, exchange, transfer, receipt, fee, refund or another supported classification. |
| Asset identification | Collection or contract address, token ID where applicable, asset symbol and quantity. |
| Gross value | The amount paid or received, the currency or token used, and the corresponding U.S.-dollar fair market value when required. |
| Fees and costs | Gas, marketplace charges, commissions, transfer taxes, royalties or other transaction costs supported by the records. |
| Basis reference | The linked acquisition transaction or document, original cost and any allocation notes. |
| Counterparty or destination | The receiving or sending address and a note identifying a self-transfer, marketplace contract or external party when known. |
| Evidence location | The filename or secure storage path for screenshots, statements and exported files. |
| Review status | Matched, needs review, duplicate, transfer or excluded with a written reason. |
Keep values in their original units as well as normalized U.S.-dollar amounts. Retaining both lets you recheck a conversion if a price feed or exchange rate is later questioned.
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This section uses U.S. federal guidance as an example; other countries and states can apply different rules. The IRS treats digital assets, including NFTs, as property and says digital-asset transactions must be reported whether or not they produce a taxable gain or loss. Its guidance calls for records of purchases, receipts, sales, exchanges and other dispositions.
For a disposition, the IRS identifies the asset type, transaction date and time, number of units, fair market value at the time and basis as key information for gain or loss calculations. Your ledger should therefore connect the disposal hash to the original acquisition evidence and to the valuation method used for the U.S.-dollar amount.
The IRS states: “The Internal Revenue Code and regulations require taxpayers to maintain sufficient records to establish the positions taken on federal income tax returns.” That requirement is broader than a marketplace download; it is why explorer records, statements and basis documents should be retained together.
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OpenSea’s tax guidance similarly says that users are responsible for determining what, if any, taxes apply to their NFT purchases, sales and transfers. That statement is general marketplace guidance, not a Blur-specific tax determination. A qualified tax professional can apply the rules to your facts, including entity ownership, inventory treatment, gifts, staking, royalties and jurisdiction.
Record fees instead of hiding them in a net amount
The IRS FAQ identifies transaction and gas fees, transfer taxes and commissions as possible transaction costs. A Blur-related sale may involve more than one of these amounts, and the explorer may show them in separate native-token transfers or internal transactions.
- Keep the gross sale or exchange value.
- Record each fee in the asset and amount actually paid.
- Record the U.S.-dollar value and valuation time used for that fee.
- Link the fee to the same transaction hash when it occurred on-chain.
- Do not assume creator earnings, marketplace fees and gas all receive identical tax treatment.
Using only a net proceeds column makes later reconciliation difficult and can obscure whether a missing amount is a fee, a transfer or an unrecorded payment.
Broker statements do not replace your own history
The IRS says brokers must report gross proceeds for covered transactions effected on or after January 1, 2025, and that basis reporting applies to certain transactions effected on or after January 1, 2026. For certain NFT and stablecoin sales, brokers may choose aggregate reporting when applicable de minimis thresholds are exceeded.
Those dates do not mean every Blur trade will generate a Form 1099-DA, nor do they establish that Blur is your broker for a particular transaction. A statement, if one arrives, is another source to reconcile against your wallet and explorer ledger. Keep records of transactions that do not appear on a statement and investigate differences in gross proceeds, dates and basis.
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Tax software can reduce manual entry after you have collected wallet addresses and hashes. OpenSea notes that unaffiliated third parties may offer services to estimate or organize taxes and names a CoinTracker partnership, while also stating that it cannot guarantee third-party services. Treat any importer as an aid, not as an authoritative report.
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- Confirm that the software supports every wallet and chain in your inventory.
- Import one wallet or chain at a time so errors are traceable.
- Compare imported rows with the explorer ledger, especially transfers, internal transactions, wrapped assets and contract interactions.
- Add acquisition records and basis manually when the importer cannot identify them.
- Check duplicates created by importing both a marketplace account and the same wallet.
- Export the software’s result and preserve the underlying source files and review notes.
Never upload private keys or seed phrases to an importer. Use public addresses, read-only connections or the provider’s documented authentication method.
Troubleshooting missing or conflicting records
The Blur page shows an event but no downloadable file
Record the event manually, save the page or screenshot with the retrieval date, and locate the matching hash through the wallet or chain explorer. The absence of a documented export does not prevent you from building a complete ledger.
The explorer shows nothing
Check the chain first. Search the same address in the explorer for that network, verify that the address was copied correctly and expand the date range. If the event occurred on another chain, the first explorer cannot display it.
The wallet total does not match the sale
Open the transaction’s token transfers and, on Ethereum, Internal Txns. Separate the NFT movement, buyer payment, marketplace fee, creator payment, gas and any refund. Wallet interfaces may collapse or omit these internal movements.
Two records appear to be the same sale
Use the transaction hash, contract address, token ID and timestamp to deduplicate. A marketplace row and an explorer row for one transaction should be linked, not counted as two disposals.
You cannot find the acquisition basis
Search earlier wallets, exchange statements, invoices and transfer records. If the asset came from a gift, trade or other non-purchase event, preserve the supporting documentation and ask a tax professional how the basis should be established. Do not invent a cost from the later sale price.
A transfer looks like a sale
Compare the sender and recipient addresses, payment movements and marketplace context. A movement between wallets you control is generally a different record type from a disposition to an unrelated party, but classification depends on your facts and applicable rules.
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- Keep original explorer exports, screenshots and marketplace files in a versioned archive.
- Maintain a separate normalized ledger and document every manual change.
- Back up the archive in at least two secure locations.
- Restrict access to public addresses, tax documents and identity information.
- Never store seed phrases or private keys in the tax ledger.
- Retain records for the period required by your jurisdiction, entity structure and tax adviser.
- Review the archive after each filing to confirm that source files still open and hashes remain searchable.
When to get professional help
Use a qualified tax professional when you have high-volume trading, multiple jurisdictions, business or inventory activity, gifts, inherited NFTs, staking or royalty income, token swaps, lost records, entity ownership or disagreement between software and source data. Bring the wallet inventory, reconciled ledger, basis evidence, fee detail and any broker statements. The clearer the source trail, the less time the professional must spend reconstructing it.
The Bottom Line
Because a Blur-native CSV or tax report is not currently verified, export your history by reconciling Blur’s Portfolio and Activity views with every relevant wallet and the correct chain explorer. Preserve hashes, timestamps, asset identifiers, gross values, fees and acquisition basis, then have a tax professional apply the rules for your jurisdiction.
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