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Stroom: TVL on bitcoin via PoR oracle (getCombinedReserveValue) #17037

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Stroom: TVL on bitcoin via PoR oracle (getCombinedReserveValue) #17037

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22 changes: 22 additions & 0 deletions projects/stroom/index.js
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const sdk = require('@defillama/sdk')

const POR_ORACLE = '0x12DB8fcA6AAA29E922bFAD8a7771aE11F17a1811'
const abi = {
getCombinedReserveValue: 'function getCombinedReserveValue() view returns (uint256)',
}

async function tvl() {
const ethApi = new sdk.ChainApi({ chain: 'ethereum' })
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@waynebruce0x waynebruce0x Nov 13, 2025

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projects/helper/bitcoin-book/index.js and a list of bitcoin wallets

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@szhygulin szhygulin Nov 13, 2025 •
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List of Bitcoin wallets is not possible to provide. Our solution is based on Lightning Network, which is off-chain L2. Bitcoins that we have locked in Stroom are storred inside Lightnign payment channels. We can try to provide a list of payment channels with corresponding multisig addresses, but that list will be changing frequently due to normal operations of Lightning Network node, moreover that list will not be representative, since inside the channel the balance distribution is constantly changing.

You can find the info about our Lightning node here: https://amboss.space/node/03fe47fdfea0f25fad0013498e8d6cec348ae3d673841ec25ee94f87c21af16ed8

You also can contact our oracle provider DIA (whitelisted on Defilama) about PoR calculation implementation
details. They have direct read-only access to Lightning Network node with BTC so they can query off-chain and on-chain balance of the node.

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@Define101 Define101 Nov 14, 2025

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@AleksDemian in your UI the available token to convert is WBTC, so things are happening on ETH
We need all the WBTC wallets on the ethereum side

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@Define101 Define101 Nov 14, 2025

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image

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@AleksDemian AleksDemian Nov 17, 2025 •
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@Define101 We have two converters that will store wBTC and cbBTC:
WBTCConverter - https://etherscan.io/address/0x56192f14c1d84e41db3d5d4c5d407efdb5cb1352
CBBTCConverter - https://etherscan.io/address/0xe7b4c44adb17147ad877eb8607eeb1e95adf2cd0

This is only part of the reserves; most of them are bitcoins stored in the Lightning Network Node.

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@AleksDemian AleksDemian Nov 21, 2025

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@Define101 Is it enough for you?
The addresses of the converters are also included in the documentation verifying oracle usage.

const satoshis = await ethApi.call({
abi: abi.getCombinedReserveValue,
target: POR_ORACLE
})
const btc = Number(satoshis) / 1e8
return { 'coingecko:bitcoin': btc }
}

module.exports = {
timetravel: false,
methodology: 'TVL equals BTC reserves tracked on Bitcoin. We read the aggregated reserve value from Stroom\'s on-chain PoR oracle on Ethereum (denominated in satoshis), divide by 1e8 to get BTC, and report it as bitcoin (USD pricing from BTC).',
bitcoin: { tvl },
}
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