Your Bitcoin, Your Exit, No Permission Required
Here’s where things get interesting. Although an operator manages the shared system and approves new members, that operator cannot simply seize someone’s bitcoin or prevent a valid withdrawal. Anyone who wants to leave can submit a mathematical proof showing how much bitcoin belongs to them. A special Bitcoin rule, known as a covenant, checks the proof, releases their funds and updates the remaining balances.
No operator approval is required to withdraw, and there’s no mandatory waiting period or expiration date for the shared output. Osuntokun’s paper also puts some numbers behind the idea. In a system with 65,536 available positions, withdrawing individually would require approximately 1,020 virtual bytes (vB), a measurement Bitcoin uses to calculate transaction fees.
That’s roughly nine times the size of a basic Bitcoin transaction, but considerably smaller than the approximately 2,511 vB needed for a comparable Ark-style withdrawal. The real savings emerge when people join together. Under the paper’s stated funding assumptions, enrolling around 1,000 members could cost less than 1 vB per person.
The Catch Behind Bitcoin’s Shared Wallet Experiment
Layertree isn’t without complications, and some are substantial. First, operators control admission. They cannot block a valid withdrawal, but they can refuse to let someone join. Second, everyone shares one Bitcoin output, meaning simultaneous withdrawals compete for the same limited transaction space. If thousands try to leave together, the system could face serious congestion.
There’s also a responsibility placed squarely on participants. Before depositing bitcoin, members must verify the mathematical records proving their balances. Failing to do so could leave their funds permanently inaccessible. Most importantly, Layertree cannot operate under Bitcoin’s current scripting rules. It requires proposed capabilities, including new instructions that haven’t been activated.
Osuntokun has developed reference software, tested scripts and mathematically verified portions of the design. Still, those accomplishments don’t establish that the complete system is secure in everyday use. Layertree offers an intriguing bargain for Bitcoin’s future. Millions of people could potentially share the cost of blockchain space while retaining control of their bitcoin. But the same shared output that makes the arrangement economical could become its biggest headache when everyone heads for the exit.
