Part of the CustodyStress archive of observed Bitcoin custody incidents
Seed phrase unavailable
Cases in this category involve wallets for which the seed phrase could not be located. Without the seed phrase, access to the wallet was not possible.
Seed phrase unavailability is the single most structurally decisive failure mode in this archive. Unlike device loss, seed unavailability typically cannot be mitigated after the fact — once the seed phrase is gone, no recovery path exists regardless of other factors. Cases arise from failure to record the seed at setup, subsequent loss of the written record, and storage in locations that became inaccessible.
146 observed cases
Blocked
89 (61%)
Constrained
6 (4%)
Survives
43 (29%)
Indeterminate
8 (5%)
They could identify the partial words but could not determine the exact BIP39 word from
Mobile or software wallet
A user who had laminated their seed phrase card for protection discovered that the lamination had caused ink bleed rendering three words partially illegible. Th
During the frantic setup they did not write down the BIP39 seed before synchronising.
Mobile or software wallet
Following the Mt. Gox closure, a user rushed to move BTC to self-custody using a newly created Mycelium wallet on a new phone. During the frantic setup they did
Seed phrase unavailable — software wallet 2014
Mobile or software wallet
A forum post documents a user who had split their 24-word Electrum seed into two 12-word halves stored in separate locations, following informal security advice
A 2014 Electrum user had written their seed on a piece of paper stored in their wallet.
Mobile or software wallet
A 2014 Electrum user had written their seed on a piece of paper stored in their wallet. The wallet was lost—along with the seed card—when the user's bag was sto
Seed phrase unavailable — software wallet 2014
Mobile or software wallet
A 2014 forum thread documents a user who had tattooed their 12-word seed phrase on their inner forearm as an unconventional backup method. Following a skin cond
A flood damaged the drawer contents.
Mobile or software wallet
A user who had set up a BIP38 encrypted paper wallet in 2013 stored both the encrypted paper wallet and the decryption passphrase in the same desk drawer. In Se
Seed phrase unavailable — software wallet 2014
Mobile or software wallet
A user who relied on a custodian's paper wallet service for cold storage found that the custodian had gone out of business and shredded all records, including p
The USB drive was later formatted as part of a routine data cleanup.
Mobile or software wallet
A user who had correctly recorded their Bitcoin-Qt wallet private keys exported the keys to a USB drive and discarded the original computer. The USB drive was l
Seed phrase unavailable — software wallet 2013
Mobile or software wallet
A user running Bitcoin-Qt before HD wallet standards generated new addresses regularly for each transaction without making fresh backups. In 2013 the wallet.dat
Paper wallet faded — software wallet (2013)
Mobile or software wallet
A 2013 forum post documented a case where a Bitcoin holder had printed a paper wallet with a QR code in 2011. By 2013 the thermal paper had faded sufficiently t
Seed phrase unavailable — software wallet 2013
Mobile or software wallet
An early miner who had stored a wallet backup on a single CD-ROM found in 2013 that disc rot had made the backup unreadable. The wallet.dat had been written to
The laptop was later encrypted with BitLocker and the BitLocker recovery key was not
Mobile or software wallet
A 2013 Bitcointalk thread documented a case where a user had correctly backed up their Electrum seed to a text file on a laptop. The laptop was later encrypted
Seed unavailable — Electrum (2013)
Mobile or software wallet
An Electrum wallet user who had generated a wallet in late 2012 did not write down the seed words displayed at setup. In 2013 when the device was replaced, the
Seed unavailable — software wallet (2013)
Mobile or software wallet
An early Bitcoin adopter who had run a mining node in 2010 and 2011 had the wallet key material stored only in a single text file on a Dropbox account. In 2013
When LastPass suffered a security breach in 2013, the user changed their master
Mobile or software wallet
An early Bitcoin adopter had backed up their wallet private keys to a LastPass account. When LastPass suffered a security breach in 2013, the user changed their
Seed unavailable — Electrum (2013)
Mobile or software wallet
A 2013 forum thread documents a user who had written their Electrum seed on a whiteboard in their home office and photographed it, intending to print and file t
Seed phrase unavailable — software wallet 2012
Mobile or software wallet
A user installed Electrum on a new computer but did not record the seed phrase generated during setup. When the original computer became unavailable, the user c
Seed phrase unavailable — software wallet 2012
Mobile or software wallet
A user wiped a computer running an older pre-HD Bitcoin wallet without first exporting the private keys or backing up the wallet file. Because older wallets did
Seed phrase unavailable — software wallet 2012
Mobile or software wallet
A user had generated a brain wallet by hashing a memorable phrase, storing no written backup under the assumption they would remember it. After several months t
Seed unavailable — Electrum (2012)
Mobile or software wallet
An early Electrum user generated a new wallet to receive mining proceeds but did not record the seed. Several months later the operating system was reinstalled.
A Bitcoin-Qt user made over 100 transactions without ever making a fresh wallet backup.
Mobile or software wallet
A Bitcoin-Qt user made over 100 transactions without ever making a fresh wallet backup. The original wallet backup held only the first 100 pre-generated keys. K
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