Bitcoin_fake_transaction_vector76_attack_full_v... -

The (also known as a one-confirmation attack) is a sophisticated form of double-spending in Bitcoin that exploits the way nodes handle "orphaned" blocks and transaction confirmations. It allows an attacker to trick a recipient (often an exchange) into accepting a transaction that will ultimately be invalidated. How the Vector76 Attack Works

: Most modern exchanges and Bitcoin services mitigate this by requiring three to six confirmations before funds are cleared, making the cost of maintaining the fake chain prohibitively expensive for an attacker. Key Characteristics Bitcoin_Fake_Transaction_Vector76_attack_Full_V...

: Once the exchange credits the account based on that one confirmation, the attacker withdraws the funds. Meanwhile, the rest of the network follows a different chain (where the original block was orphaned), and the transaction to the exchange is ultimately rejected as a double spend. Technical Context & Mitigation The (also known as a one-confirmation attack) is

: The merchant/exchange loses the goods or currency, while the attacker retains their original Bitcoin on the main chain. Key Characteristics : Once the exchange credits the

: High; requires significant hash power and precise timing.

: This attack primarily targets services that accept one confirmation for high-value deposits.

: The exchange sees the transaction to Address C and then sees the attacker's block arrive. Because the block is valid, the exchange's node may count the transaction to Address C as having one confirmation , even though that transaction is not actually in the block.