Trezor

You can use OP_RETURN in Trezor Suite to embed custom messages into Bitcoin transactions.

  1. Open Trezor Suite → Go to the Send tab and input the zkBTC Bridge Mainnet Operator Address:

bc1qcwc08898aseahq2e5920m9395py3jjtm2xnt0s90slqra7cry2dq2xv9uq

  1. Enter the amount (≥ 21,000 sats)

  2. Then click the dropdown and select “Add OP RETURN”

  1. Enter your OP_RETURN message in HEX format:

  • Right box: Type your Ethereum receiving address without "0x" prefix

  • Left box: hex-decoded binary data,usually gibberish

📌 Trezor Suite displays both your ASCII text and the corresponding hexadecimal code. Since Ethereum addresses are already HEX, If you enter them in the left box, Trezor will double-encode. This changes the address and any funds sent will be lost.

  1. Click Send to broadcast the transaction

📌 Notes:

  • OP_RETURN data is permanently stored on the blockchain

  • You can view the embedded message using any block explorer

More details: https://trezor.io/guides/trezor-suite/trezor-suite-desktop/use-op-return-in-trezor-suite

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