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| Block | Signature | Type | From | To | Amount | Fee | Status | Time |
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Check if a nullifier has been spent. Each note in the shielded pool has a unique nullifier (derived from the note's serial number and the owner's spending key). Once spent, the nullifier is recorded on-chain to prevent double-spending.
Lichen privacy uses a commitment tree and nullifier set to preserve transaction confidentiality while preventing double-spends.