HTLCs (Hash Time-Locked Contracts)
HTLCs are the cryptographic trick that makes multi-hop Lightning payments secure.
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What is an HTLC?
A Hash Time-Locked Contract is a conditional payment that requires the recipient to reveal a secret (preimage) within a time limit.
Why HTLCs Matter
HTLCs enable trustless routing. You can pay someone through intermediaries without trusting them — the cryptography ensures they can only claim the payment if they forward it correctly.