: Copy the transaction ID (TXID) into a site like Mempool.space or Blockchain.com.

Warning: This guide assumes you mean a legitimate Bitcoin-related tool called “Flash BTC Transaction — Core Network v6.3.0.” If you intended something else (different software, a wallet, or a tool for broadcasting transactions), stop — using unverified binaries can lose funds. Only download official releases from the project's official site or a verified repository (GitHub/GitLab). Do not run code from untrusted sources.

The term "Flash BTC" typically refers to two distinct things: a fraudulent scam technique or a specific legitimate wallet service (unrelated to the 6.3.0 download). The Scam (Flash BTC 6.3.0):