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INSTALL.md

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Installing

To install the QR coding software:
git clone https://github.com/r001/qr-encoding.git
cd qr-encoding
npm install

Running

To encode run the following:

node qr encode <json>

To decode please run: node qr decode <uri>

Examples

Encoding:

node qr encode '{"payload":{"chainId":1,"from":"0x23f41234567123456785123456781234567825ce","to":"0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2","nonce":"0x2d","gasPrice":"0x0165a0bc0 0","gasLimit":"0xa617","value":"0x016345785d8971","data":"0xd0e30db0"},"type":"sign_transaction","from":" 0x23f41234567123456785123456781234567825ce"}'

Will result:

eths:/?t=78002395485259294920290909039991223959489309009459249527949093990839275692922293960165900919200969061796016345785938997196930943093910

To decode above:

node qr decode eths:/?t=780023954852592949202909090399912239594893090094592 49527949093990839275692922293960165900919200969061796016345785938997196930943093910

It will result:

{"payload":{"chainId":1,"from_part":"0x23f4..............85................25ce","to":"0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2","nonce":"0x2d","gasPrice":"0x0165a0bc00","gasLimit":"0xa617","value":"0x016345785d8971","data":"0xd0e30db0"},"type":"sign_transaction","from_part":"0x23f4..............85................25ce"}

Notice, that the from: field is gone, and we have a from_part: instead. The reason for this is that the signer can find out the from address from from_part by matching it to his available addresses. By not disposing the entire from: field, 30 characters from QR code can be saved.