Custody is the question of who holds the keys to your Bitcoin. The options run from exchange custody at one end, where the exchange holds everything, to self-custody at the other, where you hold every key. Between those ends sit qualified custodians and collaborative multisig arrangements, each with different exposures to counterparty failure, your own error, and inheritance risk. These guides cover the models, the tradeoffs, and how to match the choice to your situation.