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Blockchain has been one of the top performing market sectors of 2021. The link to Bitcoin (BITCOMP) and Ethereum (ETH-X) is pretty clear and the sector clearly benefited from the crypto boom that occurred in the post-COVID-19 recession environment.

A year ago, blockchain ETFs accounted for less than $500 million in total assets. Today, that number is $2.3 billion and likely to keep climbing as cryptocurrencies gain more widespread acceptance. With an increasingly diverse set of investing options available, here are the 6 blockchain ETFs that you should consider for 2022.

Amplify Transformational Data Sharing ETF (BLOK)

BLOK was the first blockchain ETF to debut and it remains my favorite within this universe. Thanks to its first mover advantage, BLOK manages nearly 2/3 of the total assets in this space, making it easily the most liquid and cheapest to trade. My approval of BLOK goes beyond the numbers. The biggest advantage for the fund is that it's actively managed, making it one of only 4 ETFs in the space that do not track an index.

Given how rapidly the blockchain space is evolving and changing, being actively managed is incredibly important in remaining nimble and responsive to the latest trends. Passively managed funds may update only once every six months and could get left behind from where the industry is headed.

BLOK's objective is simple - invest in the equity securities of companies actively involved in the development and utilization of blockchain technologies. The fund's 0.71% expense ratio is slightly higher than the group average, but considering that you're getting an actively managed portfolio for a mere few basis points more than one of the index funds, this makes BLOK a clear favorite choice for blockchain exposure.

Bitwise Crypto Industry Innovators ETF (BITQ)

Bitwise is one of the global leaders in crypto asset management and proper indexing, so if you're looking for blockchain exposure, there are few better companies to have driving the bus. Bitwise is one of the largest crypto asset managers, with over $1.6 billion in assets.

BITQ is an index fund and offers exposure to the fast-growing bitcoin and crypto economy without the complications of owning cryptocurrencies, such as Bitcoin, directly. BITQ will not hold individual cryptos.

It targets having at least 85% of the portfolio in pure play crypto companies, including bitcoin- and crypto-trading venues, crypto mining & mining equipment firms and service providers, such as Coinbase (COIN), Silvergate Capital (SI), and MicroStrategy (MSTR). Up to 15% of assets can go into what the company calls "supporting" companies, such as PayPal (PYPL), Nvidia (NVDA), and Square (SQ).

Global X Blockchain ETF (BKCH)

Global X is a leader in the thematic ETF space, so it's not at all surprising to see it developing a blockchain ETF. Like other funds in this space, BKCH invests in companies positioned to benefit from the increased adoption of blockchain technology.

These include companies in digital asset mining, blockchain & digital asset transactions, blockchain applications, blockchain & digital asset hardware, and blockchain & digital asset integration. Top holdings include Coinbase, Riot Blockchain, Marathon Digital (MARA), and Hut 8 Mining (HUT).

While I'm not a big fan of the fund's index-linked approach, it is one of the more competitively priced offerings at 0.50%. In high growth sectors, such as blockchain, minor advantages in cost probably won't be a driving factor in decision making, but BKCH has already grown to $110 million in assets, so it does fall on the cheaper end of the spectrum.

Defiance Digital Revolution ETF (NFTZ)

If you hear about an "NFT ETF" in the news lately, this is the fund they're talking about. That characterization is a bit of a misnomer since it isn't actually investing in non-fungible tokens, but if you're looking for some exposure to the space, this ETF might be the closest you can get at this point.

NFTZ was just recently launched and is quite tiny, so investors might want to hold off until it becomes a little more investable. It tracks the composition of the BITA NFT and Blockchain Select Index, which is comprised of stocks with relevant thematic exposure to the NFT, blockchain, and cryptocurrency ecosystems. Eligible companies must either derive revenue from the crypto & blockchain space or offer issuance services and investment in NFTs.

The specific call-out of NFTs make this fund a little more unique than some of the other ETFs listed above, but NFTs will be such a small part of a company's overall business model that it's probably best to just consider this a straight blockchain ETF for the time being.

Viridi Cleaner Energy Crypto Mining & Semiconductor ETF (RIGZ)

RIGZ is unique in that not only is it focused on the crypto mining space, it's focused just on those miners that meet certain "clean energy" screens. In particular, the fund considers the size of the miner’s operation, the energy mix of the miner’s operation, the subcategory of energy mix, purchased carbon offsets, and future expected clean energy commitments made by miner’s management team.

The semiconductor piece is more of a separate piece to the RIGZ portfolio. It will focus on those names that develop or manufacture computer chips used in crypto-mining industries, but adds that it "investments in these firms will not be limited to those that are solely focused on the crypto-currency industry."

RIGZ debuted just five months ago and is relatively small with just $18 million, but it is actively managed. The 0.90% expense ratio is a little on the high side, but could find interest from investors willing to leverage a preference for ESG investments or believe that clean energy is an attractive longer-term play.

First Trust Indxx Innovative Transaction & Process ETF (LEGR)

LEGR deserves a spot on this list based on asset size, tradability, and below average costs alone. The ETF is a little more interesting because it tiers potential components based on their exposure to the industry and weights them appropriately.

"Active enablers" are actively developing blockchain technology products or systems for their own internal use and for the sale and support of other companies. "Active users" are companies that are using blockchain technology that is generally supported by an active enabler or have at least one use or test case of using blockchain technology.

"Active explorers" have publicly disclosed that they are active in exploring the incorporation of blockchain technology into their business.

Within the portfolio, active enablers receive 50% of the portfolio weighting, while active users receive 50%. The selected companies are weighted equally within each category and the index is capped at 100 constituents.