### How to sign transaction

Offline:
```
$ EMERALD_GAS_COST=21 emerald transaction \
    0x0e7c045110b8dbf29765047380898919c5cb56f4 \
    0x0e7c045110b8dbf29765047380898919c5cb56f4 \
    0x1000 \
    --gas=0x2100 \
    --nonce=0x10001 \
    < echo "secret passphrase"
```

or sent transaction for execution through remote node:
```
$ EMERALD_GAS_COST=21 emerald transaction \
    0x0e7c045110b8dbf29765047380898919c5cb56f4 \
    0x0e7c045110b8dbf29765047380898919c5cb56f4 \
    0x1000 \
    --gas=0x2100 \
    --upstream=127.0.0.1:8545 \
    < echo "secret passphrase"
```