[DigitalToday reporter Hyunwoo Choo] Cryptocurrency industry heavyweight Michael Saylor (마이클 세일러) and Adam Back (아담 백) have publicly opposed adopting Bitcoin Improvement Proposal BIP-110. They believe the proposal could undermine core principles of the Bitcoin network, blockchain media outlet U.Today reported on Saturday.

BIP-110 would treat arbitrary data, digital artefacts and tokens as spam and filter related transactions at the protocol level. Opponents warned that in the process some currently valid, fee-paying transactions could be invalidated.

Saylor, founder of Strategy, wrote on X that there are 110 things more dangerous to Bitcoin than spam. Strategy's corporate treasury holds more than 843,000 bitcoins.

Saylor said the proposal could turn the spam dispute into a change in consensus rules and invalidate some currently valid paid transactions. He added that what is dangerous is that kind of precedent, and said energy should be spent on truly important threats.

Adam Back, a Blockstream co-founder and the inventor of Hashcash, also criticised BIP-110 as conflicting with Bitcoin's principle as a permissionless currency. He argued that in a decentralised structure one cannot impose one's view on other participants, and that the core of BIP-110 ultimately aims to police other people's transactions.

Back said he also strongly dislikes spam but drew a line at enforcing behaviour at the protocol level. He said pushing BIP-110 without sufficient consensus could lead to a network split, adding that those who disagree can create a fork but Bitcoin will not join it.

He also rejected claims that the Bitcoin Core development team is swayed by outside funding. He said donations from non-profit groups are provided without conditions, donors do not take part in grant decisions, and they only hope Bitcoin remains robust.

The debate has focused less on responding to spam itself than on how far protocol rules should go in enforcement in Bitcoin. Opposition from Saylor and Back showed that the transaction-filtering debate could spread into issues over consensus rules and a network split.