http://whirtorrgetftvz4g466sjqkegtyi35bjl4bvotfkfossunf5my4x6ad.onion/blog/bitcoin-transaction-tracking
Thanks to blockchain technology, which is simply a transparent, immutable ledger accessible to everyone, all transactions that have ever taken place on Bitcoin's main chain are easily traceable. However, this does not mean that either the sender or the receiver of the transaction is publicly known.