In cryptocurrencies, a recovery seed, or shortly seed, is a list of words in a specific order which store all the information needed to recover a wallet. Keeping the recovery seed private and safe is key for long-term safety of the user's cryptocurrency funds. Synonyms: recovery sentence, recovery phrase, mnemonic.
Recovery seed and Trezor
While using Trezor Wallet, Trezor Model T creates a wallet with 12 seed words and Trezor One generates a 24-word seed. Both models are compatible with public standards and do a wallet recovery with 12, 18 and 24 words and it is possible to generate 12, 18 or 24 words on both Trezor devices. For more information please see initialize device with trezorctl command. In terms of security 12-word recovery seed is safe enough (128 bits of entropy).
As mentioned above, it is imperative to store your recovery in a safe place. Without the recovery seed, it is impossible to restore your funds in case your Trezor device is lost, stolen, or destroyed.
In addition, anyone with access to your recovery seed can also access and steal all your funds. See Keep your recovery seed safe for some security tips.
Lost or compromised recovery seed
In case you cannot find your recovery seed or you feel that it might have been compromised, the article Emergency situations might be helpful.
See also our Security section.