steemit/offline_signing repository overview

⁠offline_signing

⁠Simple offline transfer transaction signing tool

Because Steem uses TaPoS and transaction expiration times that are built into the transactions, you must first get a recent block number and block prefix with a computer that is online and can connect to the network. Once you obtain these from a separate online computer they will be good for use for the next 64k blocks (or roughly 2.2 days).

The transaction generated must be broadcast within 1 hour after being created or it will expire.

⁠Building:

docker build -t="steemit/offline_signing:latest" .

(alternatively, you can just pull in a pre-built image with docker pull steemit/offline_signing:latest)

⁠Running:

1. On a computer that is online, to collect the necessary recent reference block number and prefix, run:

• docker run -it steemit/offline_signing:latest

• Collect the two numbers and save them for the next step.

1. From an offline computer that already has the docker image built and available, run:

• docker run -it steemit/offline_signing:latest /bin/bash sign_offline_transfer.sh <ref block num> <prefix> <from account> <to account> <amount>

• The software will ask for your private key WIF. This can be either your active or owner key private key for a transfer operation.

• Note: the must have a precision of 3 - example: 10 STEEM would be 10.000

• Example of a correct command:

docker run -it steemit/offline_signing:latest /bin/bash sign_offline_transfer.sh 28468 851006437 alice bob 10.000

1. Take the generated signed transaction and broadcast it from an online computer. You have 1 hour to complete this before the transaction is expired and is no longer valid. It can be brodcasted simply using curl

• Insert the transaction in this command where it says INSERT_TRANSACTION_HERE, leave the brackets around it:

curl -s --data '{"jsonrpc":"2.0", "method":"condenser_api.broadcast_transaction", "params":[INSERT_TRANSACTION_HERE], "id":1}' https://api.steemit.com

• Example of fully filled in command:

curl -s --data '{"jsonrpc":"2.0", "method":"condenser_api.broadcast_transaction", "params":[{"ref_block_num":28468,"ref_block_prefix":851006437,"expiration":"2020-01-28T21:45:21","operations":[["transfer",{"from":"alice","to":"bob","amount":"10.000 STEEM","memo":""}]],"extensions":[],"signatures":["1f422e9f579951b9bf8333a9d419ad05dbdd9ac990b8aef5f9ac739ab698a7eef805143d9cdc43df620f15f4de0a06bc90cef3dd5ac07f77050a1c292b719d01f8"]}], "id":1}' https://api.steemit.com

• A successful submission will return an empty json result, like this: {"jsonrpc":"2.0","result":{},"id":1}. If there is an error (such as exceeding the expiration time), you will instead receive that from the node.

1. Verify that the transaction was successful using either a block explorer (like steemd.com/@accountname), or on the Steemit Wallet site (steemitwallet.com/@accountname).

⁠Alternative method without docker

If you don't have or want to use docker, you can also run this repo on any system that has Node 8.7+ and NPM installed.

To setup, run: npm install

Commands to run:

node get_block_prefix.js

node sign_offline_transfer.js <ref block num> <prefix> <from account> <to account> <amount>