Bitcoin BIP-110 Fork Could Expose Holders to Replay Attacks

cryptonews.ruPublished on 2026-08-09Last updated on 2026-08-09

Abstract

Bitcoin developer Kevin Loewack has warned that a potential network split due to the BIP-110 protocol could lead to BTC holders losing their coins. The risk arises if users attempt to sell coins created by the fork without first splitting their balances. In a network split, two transaction histories with identical balances at the fork point would emerge. For example, an investor with 10 BTC before the fork would control 10 coins on each resulting chain. However, both networks can recognize the same signed transaction. A buyer could copy the transaction used to transfer forked coins and broadcast it to the main Bitcoin network. If accepted, the seller would unintentionally send the same amount of genuine BTC to the buyer's address. To conduct safe transactions, investors must "split" their coins by obtaining and spending them only on one specific chain. Wallet providers or exchanges may develop tools to address this issue in the future. BIP-110 (Reduced Data Temporary Softfork) is a proposal to temporarily limit non-financial data in the blockchain for one year to combat spam and reduce network node load. Its activation requires 55% miner support over a specific block period. As of mid-July 2026, support remains below 2%, with an activation deadline in August 2026.

Bitcoin developer Kevin Loewke warned that after a potential network split following the BIP-110 protocol, $BTC holders could face the risk of losing their coins. The problem arises if one attempts to sell coins created by the fork without first splitting their balances.

The expert explained that in the event of a network split, two transaction histories will emerge with identical balances at the moment of the fork. For example, if an investor had 10 $BTC before the split, after the fork they would control 10 coins in each of the resulting chains. However, both networks might recognize the same signed transaction.

A buyer could copy the transaction used to transfer the forked coins and broadcast it to the main Bitcoin network. If the transaction is accepted, the seller would transfer the same amount of genuine $BTC to the buyer's address.

To conduct safe transactions, investors need to "split" their coins, receiving and spending them only on one chain. In the future, wallet providers or exchanges might create tools to address this issue.

BIP-110 (Bitcoin Improvement Proposal 110), also known as the Reduced Data Temporary Softfork, is a proposal to modify the Bitcoin protocol. The fork is intended to temporarily (for one year) restrict the placement of non-financial data on the blockchain to combat spam and reduce the load on network nodes.

Launching BIP-110 requires support from 55% of validating blocks over a specific block period. As of mid-July 2026, support for the proposal is less than 2%, and the activation deadline is in August 2026.

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Related Questions

QAccording to the article, what is the main risk that Bitcoin holders might face after a BIP-110 fork?

AThey risk losing their Bitcoin if they try to sell coins from the forked chain without first splitting their balances, because a transaction signed on the forked chain could be replayed on the main chain.

QWhat does Bitcoin developer Kevin Loewak suggest investors do to make transactions safely after a potential network split?

AInvestors need to 'split' their coins by obtaining and spending them exclusively on one branch of the chain to prevent transaction replay attacks.

QWhat is the primary goal of the BIP-110 proposal as described in the article?

AIts goal is to temporarily limit the placement of non-financial data in the Bitcoin blockchain for one year to combat spam and reduce the load on network nodes.

QWhat is the activation threshold and current support level for BIP-110 as of mid-July 2026, according to the article?

AThe activation requires support from 55% of validating blocks over a specific period. As of mid-July 2026, support is less than 2%, with an activation deadline in August 2026.

QHow does a transaction replay attack work after a Bitcoin fork, based on the article's explanation?

AA buyer can copy a signed transaction used to transfer forked coins and broadcast it to the main Bitcoin network. If accepted, the seller would unintentionally transfer the same amount of genuine BTC to the buyer's address.

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