dead mans switch

split your seed phrase into 3 shards using shamirs secret sharing. any 2 shards can recover your seed. 1 shard alone = nothing.

100% client-side. your seed never leaves your browser.

go offline first. disconnect wifi/ethernet before entering your real seed phrase. maximum security.

step 1: enter your seed phrase

enter your 12 or 24 word bip-39 seed phrase:

step 2: save your shards

done! your seed has been split into 3 shards. any 2 can recover it.

shard A (your backup)
shard B (for beneficiary)
shard C (server shard)
save all 3 shards before continuing. you need at least 2 to recover.

step 3: activate the switch

enter your email and your beneficiarys email. well store shard C and release it if you stop responding to check-ins.

by clicking activate, you agree to the terms of service.

recover from shards

have 2 shards? combine them to recover your seed:

how it works

back to deadhand

open source. read the code