1
The problem is that eth.sign returns a signature where v is 0 or 1 and ecrecover expect it to be 27 or 28.
A note in the documentation for web3 v0.20 is clear:
Note that if you are using ecrecover, v will be either "00" or "01".
As a result, in order to use this value, you will have to parse it to
an integer and then add 27. This will result in ...
1
javascript cannot handle those big numbers, Use the method web3.utils.toWei(number [, unit]).
const amount = web3.utils.toWei(1, 'ether');
1
It's okay to define a contract instance every time you need it,
as the ABI and deployed address haven't changed, and your web3 library
is only creating a Javascript object off-chain, not checking on-chain
or doing anything slow over the network.
I think the efficiency difference is negligible, but if you can create your contract instance once and pass it ...
1
The solution was to create and add the account from which to send the transaction into a wallet.
adding the line
web3.eth.accounts.wallet.add('address_private_key')
above the method.send() fixed it for me.
1
Just in case someone comes here later, in the recent version of ethers, HDNODE has been moved to the utils method. So, in modification to @George's answer above;
const ethers = require('ethers');
const mnemonic = await ethers.utils.HDNode.entropyToMnemonic(ethers.utils.randomBytes(16));
const wallet = ethers.Wallet.fromMnemonic(mnemonic);
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