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Anyone used Sigbash? Purchase a special key for your multi sig (with conditions)
345 sats \ 1 comment \ @Signal312 16h bitcoin
It looks like it allows you to actually set conditions for say, the 3rd key of a 2 of 3 multisig. You can set a timelock, price threshold, etc.
I can't say I understand it all, but it looks intriguing. Is anyone else doing this kind of service?
This is the URL: https://sigbash.com/. And this is from the FAQ:
What is Sigbash? Sigbash is your smart Bitcoin security partner. We provide a specialized key for your Bitcoin multisig wallet that only signs transactions when your specific conditions are met - like price thresholds, time locks, or balance requirements. Unlike traditional services, Sigbash never sees your actual keys until signing time, protecting your privacy and funds.
How it works: You purchase a blinded Bitcoin extended public key (xpub) from Sigbash, use it in your multi-signature wallet, and when you need to spend, submit your Partially Signed Bitcoin Transaction (PSBT) to us. We'll sign it automatically if your conditions are met - no human intervention required.
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134 sats \ 0 replies \ @Scoresby 16h
They have a decent FAQ:
Here's our trust model and safeguards:
Trust Minimization:
- Sigbash can't move your funds on its own - it's just one key in your multisig setup
- We don't know what funds you're protecting until you request a signature
- Every xpub comes with a cryptographically signed receipt proving its conditions
- Our receipts are timestamped on the Bitcoin blockchain via OpenTimestamps
If Sigbash doesn't sign when it should: Contact support at sigbashsupport@proton.me with your signed receipt. We recommend having backup plans like timelocked recovery paths in your wallet setup.
If Sigbash signs when it shouldn't: This would require a significant breach of our security model. Our reputation as a service depends on never violating signing conditions, which is why we provide GPG-signed receipts attesting to them.
There is also a Citadel Dispatch episode with Arbedout, creator Sigbash.
I'm leery of cold storage services that rely on someone else doing something when I ask them.
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