Image courtesy of 123rf.

Over the weekend, the Bitcoin network came before a significant fork in the road. Elevated ordinals activity congested the blockchain to such an extent as to cause over 450,000 unconfirmed transactions. Is this simply a case of wider adoption or a DoS attack?

Bitcoin Network Reeling from Activity

When we explained Bitcoin ordinals in February, we foreshadowed potential congestion problems for the entire Bitcoin network—this day arrived on Sunday. 

Piggybacking on Bitcoin’s UTXO (Unspent Transaction Output) model, ordinals add mediatic content to Bitcoin, previously reserved for Ethereum’s non-fungible tokens (NFTs). The Ordinals protocol, launched in January, spawned BRC-20 tokens, following in the footsteps of Ethereum’s ERC-20 fungible tokens but without smart contracts.

While extra utility sounds good on paper, the problem is there is only so much network bandwidth to go around. And Bitcoin doesn’t have much to spare, at 4 MB per transaction block. On Sunday, ordinal inscriptions reached an all-time high of 400,000. 

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The novelty of Bitcoin ordinals doesn’t seem to be a fad. Image credit: Dune analytics via @dgtl_assets

Although the ordinal frenzy raised total paid fees to over $21 million (789.4 BTC), it also created massive congestion. At press time, there are over 452,000 unconfirmed transactions in Bitcoin’s mempool space, constituting a new historic high.

When Bitcoin transactions are created, they are broadcasted to all the miners and added to the mempool. In this waiting room, Bitcoin miners select the transactions to add them to a new block to be confirmed as valid and forever added to the ledger.

However, because the mempool space is so scarce, transactions with higher fees take priority. With extra ordinals load now in the mix, Bitcoin fees have also skyrocketed accordingly, at 2.905 BTC per block.

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Thanks to ordinals, the average Bitcoin fee is comparable to the heights of previous bull runs. Image credit: glassnode

Implications for Bitcoin’s Future

With mempool demand going through the roof, Bitcoin miners are boosting their revenue from an already good start of the year. A week ago, the average Bitcoin transaction fee was ~$3. Now, it is at ~$19, the highest level since May 2021. Bitcoin miners now receive a record percentage of revenue from block rewards, at 46.5%, with some block fees going as high as 94%.

Although this is bad development from the users’ standpoint, miners’ incentives are significantly boosted to keep the network decentralized and secured. Indeed, the network’s hash rate reached an all-time high on Friday at 356 million TH/s. 

However, one has to question if the flood of ordinals/BRC-20 tokens doesn’t detract from Bitcoin’s core purpose – sound money. Some users have gone so far as to classify the increased network activity as a DoS (denial of service) attack. 

Bitcoin is under DoS attack. High transaction fees are the chosen pain point by the attacker, probably to makes bitcoin unusable for smaller players. pic.twitter.com/0J56liNSGf

— iris.to/jogi (@proofofjogi) May 7, 2023

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