Rebuilding a 17-word Blockchain.info mnemonic
The client had all the words to an old Blockchain.info backup — just not in the right order, and not all of them legible.
At a glance — Wallet: Blockchain.info (15–25 word backup) · Problem: partial / out-of-order phrase · Method: checksum + address-anchored reconstruction · Outcome: wallet restored · Fee: success-based
The situation
The client had written down their Blockchain.info backup years ago — a 17-word phrase in that wallet’s own (non-BIP39) format — but the handwriting was smudged on two words and they were unsure of the order. A wallet was clearly there; the phrase just wouldn’t restore as written.
The challenge
Unlike a standard BIP39 seed, Blockchain.info used its own mnemonic scheme, and word order is decisive. With two uncertain words and an unknown ordering, the number of combinations was large — but bounded, because a known receiving address let us confirm the correct one.
How we recovered it
We resolved the two smudged words to their most likely candidates, then tested valid orderings and candidate combinations against the client’s known address until the derivation matched. The correct phrase reproduced the wallet exactly.
The outcome
The wallet restored and the client swept the funds to a modern wallet with a clean backup. Success-based fee, nothing upfront.
Have a similar case?
Have most of an old backup phrase but not all of it, or unsure of the order? That’s often recoverable. Related: Blockchain.com recovery · Recover a Bitcoin wallet
Missing part of your seed phrase?
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