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bitcoin-oracle/on-demand-consensus-data.md
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# "On Demand" Consensus Data
## End consumer of consensus data dictates how it is verified
## End consumer of consensus data dictates how it is validated and verified
Bitcoin Oracle produces the consensus data based on the computation from the off-chain engines, but the verification of such consensus data can be implemented by the end consumer as they see fit.
Bitcoin Oracle produces the consensus data based on the computation from the off-chain engines, but the validation and verification of such consensus data can be implemented by the end consumer as they see fit.
For example, wallet integrating Bitcoin Oracle may implement a client-side verification of the consensus data, instead of relying on an on-chain verification.
For example, wallet integrating Bitcoin Oracle may implement a client-side verification of the consensus data, instead of relying on an on-chain validation.
A website that wants to display users' BRC20 balances, but do not need to verify the consensus data, may simply use the data without verification.
A BRC20 trading dapp on an EVM-compatible Bitcoin L2 may implement their own smart contract written in Solidity to verify the consensus data, before initiating other smart contract interactions.
A BRC20 trading dapp on an EVM-compatible Bitcoin L2 may implement their own smart contract written in Solidity to validate the consensus data, before initiating other smart contract interactions.
## So how can one fetch the consensus data from Bitcoin Oracle?
@@ -82,14 +82,14 @@ The endpoint supports query conditions for addresses in two formats: Bech32 and
[https://api.bitcoin-oracle.network/swagger-ui-yaml](https://api.bitcoin-oracle.network/swagger-ui-yaml)
{% endswagger %}
#### How to verify the consensus data
#### How to validate the consensus data
With the consensus data, you can 
1. determine if a minimum threshold you require was reached among data providers
2. (for Stacks smart contracts) determine whether or not the relevant Bitcoin transaction was indeed mined
#### Verification of off-chain computation
#### Validation of off-chain computation
`order_hash` is the sha256 hash of the following tuple: