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Spark is a Bitcoin Layer 2 network that uses a shared-signature protocol for off-chain transactions, enabling instant, near-zero-cost transfers of bitcoin and native assets such as stablecoins. It supports issuance and management of stablecoins, is natively interoperable with the Lightning Network, and keeps users self-custodial. Developers can quickly integrate wallets and payments via SDKs. Transactions are co-signed by users and operators, ensuring non-custodial operation and allowing forced withdrawals to the Bitcoin mainnet.