# Motivation There have been multiple proposals over the years in the bitcoin vault design space and they all have one thing in common: the security either relies on trusted or bonded signatories. A large single reserve UTXO is privy to a 2/3rd collusion of the signatory set where 100% of the funds could be stolen. We’ve now seen this time and time again, with different set of custodian services such as centralised exchanges and lending institutions. where funds were spent without depositor’s consent, leading to unexpected counter-party risk. Some proposals asks for minimum bond value of 150% or more of the reserve value by the signatories in order to guarantee funds, a model which is economically expensive to scale. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.twilight.org/boomerang/motivation.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.