Definition
In Bitcoin, a federation is a fixed set of independent operators who collectively control funds or a secondary network through a threshold multisignature scheme. Instead of one custodian or a fully permissionless validator set, a federation distributes trust across a known group, where a quorum, for example 11 of 15 members, must agree before funds move or a block is finalized. The system is secure as long as fewer than the threshold of members collude or fail.
How federations are used
The best-known example is Blockstream's Liquid Network, a federated sidechain where 15 functionaries take turns proposing blocks and Bitcoin is locked in an 11-of-15 multisig. Users peg in by sending BTC to a federation-controlled address and, after a confirmation delay, receive an equivalent asset on the sidechain; pegging out reverses the process through the federation's signers. Fedimint applies the same idea to community custody, where federation guardians jointly back Chaumian ecash. In every case the federation enforces rules and processes transfers but cannot rewrite the underlying Bitcoin ledger.
The trust trade-off
Federations occupy a deliberate middle ground between full self-custody and a single trusted third party. They unlock features Bitcoin's base layer cannot offer natively, faster settlement, confidential transactions, or token issuance, while accepting that a colluding quorum could censor withdrawals or, in custodial designs, seize funds. The honesty assumption is explicit and the membership is auditable, which is why federations are favored where decentralization can be relaxed but accountability must remain.
The federation model underpins ecash systems like the Chaumian mint and contrasts with trustless sacrifice schemes such as the fidelity bond.
In Simple Terms
In Bitcoin, a federation is a fixed set of independent operators who collectively control funds or a secondary network through a threshold multisignature scheme. Instead…