Crypto traders are tracking a jaw-dropping Bitcoin transfer of about $4.5 billion in BTC. The movement, which was first detected by the automated ledger tracker BTC Block Bot, sent 103,510 BTC in a single transaction for a fee of just $21. It dwarfs a $1.1 billion transfer of 88,857 BTC made in October of last year that was widely regarded as the largest dollar value Bitcoin transaction ever made. A look at the sending address involved in Saturday's transaction shows the cryptocurrency exchange Bitfinex is behind the transfer. According to Bitinfocharts, the address is a cold wallet owned by the cryptocurrency exchange. Although the exchange has not released a statement on the transaction, it has a history of moving large amounts of BTC on a fairly regular basis. At time of publishing, the cold wallet remains the third-wealthiest Bitcoin address on record. Even after Saturday's giant transfer, the wallet holds 98,511 BTC worth about $4.3 billion.