A blockchain explorer presents network records in a searchable interface. Learn what transaction, address and block views can establish—and what they cannot.

A black swan describes a consequential surprise outside normal expectations. The concept highlights the limits of prediction and the importance of examining fragile assumptions.

A blockchain bridge connects activity across networks. Its asset representation, verification process and completion rules determine what a cross-chain transfer actually does.

Bagholder is informal language for someone still holding an asset after a substantial decline. The label does not explain the asset’s prospects or the holder’s circumstances.

Bitcoin dominance measures Bitcoin’s share of a defined crypto market capitalization total. The result depends on prices, supply estimates and the assets included in the comparison.

A bull market describes a sustained rising-price phase with positive sentiment. The label needs a defined market and period, and does not guarantee continuing gains.

A bear market describes a sustained declining-price phase with pessimistic sentiment. Its boundaries depend on the market and method, and a decline does not guarantee a rebound.

A block groups transactions and related data under a network’s rules. Links between blocks support an ordered history, while validation and consensus determine which history is accepted.