| title | description | sidebar_position | tags | |
|---|---|---|---|---|
Sign privacy marker transactions |
How to sign a privacy marker transaction with Besu |
7 |
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:::caution
Tessera-based privacy is deprecated in Besu version 24.12.0 and later. Please read this blog post for more context on the rationale behind this decision as well as alternative options.
:::
You can sign privacy marker transactions (PMTs) with either a random key or a specified key. To sign privacy marker transactions with a specified private key, use --privacy-marker-transaction-signing-key-file when starting Besu.
:::note
The private key file can be the same file used by --node-private-key-file, or a different key file to identify who signed the privacy marker transaction.
:::
In networks where you pay gas, you must specify a key and the associated account must contain adequate funds.
In free gas networks, to provide further anonymity by signing each privacy marker transaction with a different random key, exclude the --privacy-marker-transaction-signing-key-file command line option when starting Besu.
:::caution "Using account permissioning and privacy"
You can't use account permissioning with random key signing.
If using account permissioning and privacy, a signing key must be specified using the --privacy-marker-transaction-signing-key-file command line option and the corresponding public key included in the accounts allowlist.
:::
:::note
Besu signs privacy marker transactions during the private transaction process.
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