Stuckless Payments

Stuckless payments are a proposed upgrade to Lightning Network payments designed to eliminate stuck payments, the situation where an in-flight payment can neither complete nor be safely cancelled until its timelocks expire, which can take hours or, on long routes, more than a day.

How it works

A Lightning payment today locks funds hop by hop with hashed time locked contracts. If a node along the route goes offline before settlement finishes, the payment stalls, and the sender cannot safely retry along another path because the original payment might still complete, causing a double payment. The stuckless design, first sketched on the Lightning development mailing list in 2019, splits settlement into two phases: the funds travel to the recipient as usual, but the recipient cannot claim them until the sender releases a final secret in an extra round of communication. Until that release, the sender can abandon a stalled attempt and retry elsewhere with no double-spend risk. The construction depends on point time locked contracts (PTLCs), which use the Schnorr signatures bitcoin gained in the 2021 Taproot upgrade, and it remains a proposal rather than deployed protocol.

In the gold vs bitcoin debate

Payment reliability is where bitcoin's medium-of-exchange ambitions are tested. Gold settles instantly in person and essentially never in any other way without intermediaries, while bitcoin's layered architecture keeps iterating toward card-network dependability without custodians. Proposals like stuckless payments show that the gap between digital sound money and usable everyday money is an active engineering frontier, not a settled verdict.