Summary
This is a experiment to see if a transaction with OP_RETURN > 80 is currently accepted by the bitcoin network
Reference
- Technical discussion about bitcoin core changes on bitcointalk
- Bitnodes is currently listing v30.0.0 nodes at around 9%
How to
Most current bitcoin wallets will currently reject >80 bytes OP_RETURN. So a wokaround is needed.
- Download and run bitcoin core v30.0 and let it sync in prune mode
- Crafting raw OP_RETURN tx on core is tricking so we use electrum
. You must convert your text to hex and paste after OP_RETURN . The first address can be your own wallet address - Don’t directly send from electrum at it will refuse to broadcast it
- Now click on Pay > Preview > Sign
- Now click on Share > Copy to Clipboard
- Now broadcast transaction using bitcoin-cli
bitcoin-cli sendrawtransaction <paste the hex copied from clipboard> - It will generate a txid
- Monitor the txid on few blockexplorers. None of them will show it !! Don’t get disappointed
- Try to incentivize the miners more and increase the fee. Still tx will not show in mempool, however, it will straightaway end up in a bitcoin block
Result
Two transactions with 912 bytes in OP_RETURN . Text is starting of satoshi.pdf
- Tx1 with fee of 2 USD /1.8 satoshi/byte 03a19102c0bcfecab26ee8631ee4625e6eb4b5ddf24277ecf5d4487a77702b79
- Tx2 with fee of 80 USD / 70 satoshi/bytes
f5de4018e1ee823742baaf38bbebed1dbbea7473c3d11664b26b7f1d7b4a1e20
