Loom Examples

This repository holds a few example projects.

Universal Signing Demos

The simple universal signing demos show how Loom universal signing works.

Install

npm install

Deploy to Extdev

First, let's generate your Loom private key by running:

npm run gen:loom-key

Then, we can migrate the the SimpleStore smart contract:

npm run migrate:loom

Start the web server

npm run start

Open http://localhost:8080/ in your favorite browser.

Transaction Hash Discrepancy

At 3 different times during the process of sending a raw (signed) transaction, I see different transaction hashes. I expect to see a single hash. With the current hash discrepancy, there is not a clean way to query for the results of a transaction by the pre-computed transaction hash as you would normally for an ethereum transaction.

Also, even if you capture the transaction hash from the TransactionReceipt returned by Loom, that hash is different from the hash that is emitted as part of the contract events.

Test account

address: 0x41ef0087901189bB5134De780fC6b3392C7914E6

privateKey: 0x0110000101110100011001010111001101110100011010110110010101111001

Import this private key in to your metamask. Run the example with the commands above, and when utilizing the EthSigning example served in your local browser to increment the counter, you will be using the JSON RPC endpoint at: wss://extdev-plasma-us1.dappchains.com/eth with standard web3js.

Updated code can be found in the added _setValueRawTransaction() method of EthSigning.js

3 different transaction hashes

ethereumjs-tx hash

This is calculated when signing the transaction with a privateKey, prior to sending to wss://extdev-plasma-us1.dappchains.com/eth, using the standard ethereumjs-tx methods to sign a generated transaction. 0x3f72d201279d1d83b84fcbd4adc5ac4b0c929f57104d837f1a800f5da9d63f75

No transaction by this hash is found in the exposed /rpc endpoint. https://extdev-plasma-us1.dappchains.com/rpc/tx?hash=0x3f72d201279d1d83b84fcbd4adc5ac4b0c929f57104d837f1a800f5da9d63f75

This transaction hash is not indexed in the block explorer.

Contract Events are not associated to this hash.

getTransactionReceipt hash

This is the hash returned in the receipt from Loom after we call web3.eth.sendSignedTransaction: 0x1ae4e511202fa8ceb502df825778ada19f7a04c00a351392222ea317e90dde52

A transaction is found in the exposed /rpc endpoint and it appears to be the call.evm transaction. https://extdev-plasma-us1.dappchains.com/rpc/tx?hash=0x1ae4e511202fa8ceb502df825778ada19f7a04c00a351392222ea317e90dde52

This transaction hash is not indexed in the block explorer.

Contract Events are not associated to this hash.

getTransaction hash

This hash is found in the "Transaction" object returned from querying for the transaction hash found in the receipt web3.eth.getTransaction(0x1ae4e511202fa8ceb502df825778ada19f7a04c00a351392222ea317e90dde52): 0x2aff25fbe08cdb6012489a3954e4eee7ee331a8d47f24be6a6a34a105920e404

No transaction by this hash is found in the exposed /rpc endpoint. https://extdev-plasma-us1.dappchains.com/rpc/tx?hash=0x2aff25fbe08cdb6012489a3954e4eee7ee331a8d47f24be6a6a34a105920e404

This transaction hash is indexed in the block explorer: https://extdev-blockexplorer.dappchains.com/tx/0x2aff25fbe08cdb6012489a3954e4eee7ee331a8d47f24be6a6a34a105920e404

Emitted Contract Events are associated to this hash.

Debug Output

callerAddress: eth:0x41ef0087901189bb5134de780fc6b3392c7914e6
mapping already exists
mapping.ethereum: eth:0x41ef0087901189bb5134de780fc6b3392c7914e6
mapping.loom: extdev-plasma-us1:0x4969f8a34c1eacdd792641423470fa38826c4925
Setting value: 1

unsignedTx: {
  "nonce": 46,
  "gasPrice": 0,
  "gasLimit": 0,
  "to": "0xf03FFb4fbEBB58AE936741C0B4D756e9412Cab9B",
  "value": 0,
  "data": "0x60fe47b10000000000000000000000000000000000000000000000000000000000000001"
}

Signed Tx: {
  "nonce": "0x2e",
  "gasPrice": "0x",
  "gasLimit": "0x",
  "to": "0xf03ffb4fbebb58ae936741c0b4d756e9412cab9b",
  "value": "0x",
  "data": "0x60fe47b10000000000000000000000000000000000000000000000000000000000000001",
  "v": "0x1b",
  "r": "0x1efdd0467fff2dc590cdab5f6a9415e7000f809e0c86c968e8b3c34eb067f9e2",
  "s": "0x7e863b37937eb9a62772da20e8d4e8d1b13fa8db0d59bde7f214ebb9f7d4d217"
}

rawSignedTx: "0xf8812e808094f03ffb4fbebb58ae936741c0b4d756e9412cab9b80a460fe47b100000000000000000000000000000000000000000000000000000000000000011ba01efdd0467fff2dc590cdab5f6a9415e7000f809e0c86c968e8b3c34eb067f9e2a07e863b37937eb9a62772da20e8d4e8d1b13fa8db0d59bde7f214ebb9f7d4d217"

Transaction Receipt: {
  "transactionHash": "0x1ae4e511202fa8ceb502df825778ada19f7a04c00a351392222ea317e90dde52",
  "transactionIndex": 0,
  "blockHash": "0xa6cc5fc800760dbcf0e94a613bf00c3ec3b5e6d474f4f1ec504996ee39cc2f0d",
  "blockNumber": 10306567,
  "from": "0x4969f8a34c1eacdd792641423470fa38826c4925",
  "cumulativeGasUsed": 0,
  "gasUsed": 0,
  "contractAddress": null,
  "to": "0xf03ffb4fbebb58ae936741c0b4d756e9412cab9b",
  "logs": [
    {
      "logIndex": 0,
      "transactionIndex": 0,
      "transactionHash": "0x1ae4e511202fa8ceb502df825778ada19f7a04c00a351392222ea317e90dde52",
      "blockHash": "0xa6cc5fc800760dbcf0e94a613bf00c3ec3b5e6d474f4f1ec504996ee39cc2f0d",
      "blockNumber": 10306567,
      "address": "0xf03FFb4fbEBB58AE936741C0B4D756e9412Cab9B",
      "data": "0x0000000000000000000000000000000000000000000000000000000000000001",
      "topics": [
        "0xb922f092a64f1a076de6f21e4d7c6400b6e55791cc935e7bb8e7e90f7652f15b"
      ],
      "blockTime": "0x5e33376f",
      "id": "log_fec12164"
    }
  ],
  "logsBloom": "0x002080808a88041005",
  "status": true
}

Transaction by 0x1ae4e511202fa8ceb502df825778ada19f7a04c00a351392222ea317e90dde52: {
  "hash": "0x2aff25fbe08cdb6012489a3954e4eee7ee331a8d47f24be6a6a34a105920e404",
  "nonce": 47,
  "blockHash": "0xa6cc5fc800760dbcf0e94a613bf00c3ec3b5e6d474f4f1ec504996ee39cc2f0d",
  "blockNumber": 10306567,
  "transactionIndex": 0,
  "from": "0x41ef0087901189bB5134De780fC6b3392C7914E6",
  "to": "0xf03FFb4fbEBB58AE936741C0B4D756e9412Cab9B",
  "value": "0",
  "gasPrice": "0",
  "gas": 0,
  "input": "0x60fe47b10000000000000000000000000000000000000000000000000000000000000001"
}

Transaction by 0x2aff25fbe08cdb6012489a3954e4eee7ee331a8d47f24be6a6a34a105920e404: {
  "hash": "0x2aff25fbe08cdb6012489a3954e4eee7ee331a8d47f24be6a6a34a105920e404",
  "nonce": 47,
  "blockHash": "0xa6cc5fc800760dbcf0e94a613bf00c3ec3b5e6d474f4f1ec504996ee39cc2f0d",
  "blockNumber": 10306567,
  "transactionIndex": 0,
  "from": "0x41ef0087901189bB5134De780fC6b3392C7914E6",
  "to": "0xf03FFb4fbEBB58AE936741C0B4D756e9412Cab9B",
  "value": "0",
  "gasPrice": "0",
  "gas": 0,
  "input": "0x60fe47b10000000000000000000000000000000000000000000000000000000000000001"
}

Events for Transaction: [
  {
    "logIndex": 0,
    "transactionIndex": 0,
    "transactionHash": "0x2aff25fbe08cdb6012489a3954e4eee7ee331a8d47f24be6a6a34a105920e404",
    "blockHash": "0xa6cc5fc800760dbcf0e94a613bf00c3ec3b5e6d474f4f1ec504996ee39cc2f0d",
    "blockNumber": 10306567,
    "address": "0xf03FFb4fbEBB58AE936741C0B4D756e9412Cab9B",
    "data": "0x0000000000000000000000000000000000000000000000000000000000000001",
    "topics": [
      "0xb922f092a64f1a076de6f21e4d7c6400b6e55791cc935e7bb8e7e90f7652f15b"
    ],
    "blockTime": "0x5e33376f",
    "id": "log_cd58e663"
  }
]