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Offline Tezos Ops

This tool illustrates how to forge and sign a list of transactions in an offline/air-gapped environment.

The tool supports transfers of Tezos tokens from a single sender address. Support for transfers of asset contracts will be added.

Let's assume we have two environments, an on-line environment that has access to an active Tezos node, and an offline/air-gapped environment. We will assume that this utility is installed and operable on both environments.

Pre-requests for operation:

  • A JSON file containing the desired transactions. See sample-input.json
  • The public key (not the public key hash) of the sending wallet
  • The private key of the sending wallet (presumed to be located on the air-gapped system and handled securely)

Step 1

Run the 'prepare' step.

npm --silent start -- prepare \
        -s edpkkohFDNUFETtUZ6kZwm5uHrRLA6GrqKoSkeZXg3B7pufSi1tGoZ \
        -i ./sample-input.json > txs_for_secure_environment.json

This step prepares your transactions, and estimated each one using the Tezos RPC node. It writes the prepared transactions to a file.

Step 2

Securely copy the prepared transactions JSON file to the secured/air-gapped environment.

Step 3

Run the sign step

npm --silent start -- sign \
        --signing_key edsk417kwqd67ze6DhCwtDR9PYnii5NKCmaXmgML89CvDiS1jV2EHU \
        -i ./txs_for_secure_environment.json > signed_bytes.txt

This step takes your private key, and your prepared transactions. It forged the transactions into a single operation and then signs that operation with your private key.

Step 4

Securely copy the signed_bytes.txt file from the secured/air-gapped system to the online environment.

Step 5

$ npm start -- inject "$(cat signed_bytes.txt)"
https://babylon.tzkt.io/oo9vRAhFamKUqbysvNqNPokjz8LWuZnYBuZDSLWU1X9K3U1Vafa