Numerai Tournament Custom Staking

The process for custom staking has changed following the recent upgrade of the NMR token.

Custom staking now requires a two step process.

1. Approve tournament to perform token transfer.
2. Stake on the tournament.

Approving Token Transfer

We recommend approving the tournament to transfer the maximum amount of tokens in order to avoid repeating this approval step every week. The easiest way to do this is to go to myetherwallet under send transaction. Note this method requires no approval has been previously given.

from: (wallet used for staking)
to: 0x1776e1F26f98b1A5dF9cD347953a26dd3Cb46671 (NMR token contract)
value: 0
data: 0x095ea7b30000000000000000000000009dce896ddc20ba883600176678cbee2b8ba188a9ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff (approve max value)
gasLimit: 50000

An alternative is to send directly using web3 with an unlocked wallet:

web3.eth.sendTransaction({
    from: (wallet used for staking), 
    to: '0x1776e1F26f98b1A5dF9cD347953a26dd3Cb46671', 
    data: '0x095ea7b30000000000000000000000009dce896ddc20ba883600176678cbee2b8ba188a9ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff',
    gas: 50000
})

/* Note: the data in the previous example was generated as follows */

calldata = web3.eth.abi.encodeFunctionCall(
    {
      "inputs": [
        {
          "name": "spender",
          "type": "address"
        },
        {
          "name": "value",
          "type": "uint256"
        }
      ],
      "name": "approve",
      "type": "function"
    },[
        '0x9DCe896DdC20BA883600176678cbEe2B8BA188A9', 
        '0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff'
    ]
)

Staking

Staking requires interacting with the tournament contract directly. On myetherwallet go to interact with contract and input the required information.

Contract Address: 0x9DCe896DdC20BA883600176678cbEe2B8BA188A9
ABI/JSON Interface: [{"constant":false,"inputs":[{"name":"tournamentID","type":"uint256"},{"name":"roundID","type":"uint256"},{"name":"tag","type":"bytes32"},{"name":"stakeAmount","type":"uint256"},{"name":"confidence","type":"uint256"}],"name":"stake","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]

Select an item: stake

TournamentID (uint256): 7 (Kazutsugi)
RoundID (uint256): roundId (increments every week)
Tag (bytes32): hex encoded username
StakeAmount (uint256): amount of nmr in wei (multiply by 10^18)
Confidence (uint256): 3 decimals of confidence (ex: .503 -> 503)

The equivalent web3 version:

calldata = web3.eth.abi.encodeFunctionCall(
    {
      "inputs": [
        {
          "name": "tournamentID",
          "type": "uint256"
        },
        {
          "name": "roundID",
          "type": "uint256"
        },
        {
          "name": "tag",
          "type": "bytes32"
        },
        {
          "name": "stakeAmount",
          "type": "uint256"
        },
        {
          "name": "confidence",
          "type": "uint256"
        }
      ],
      "name": "stake",
      "type": "function"
    },[
        1, 
        166,
        web3.utils.padLeft(web3.utils.utf8ToHex('quantverse'), 64),
        web3.utils.toWei('1'),
        503
    ]
)

web3.eth.sendTransaction({
    from: (wallet used for staking), 
    to: '0x9DCe896DdC20BA883600176678cbEe2B8BA188A9', 
    data: calldata,
    gas: 70000
})