In blockchain smart contracts, when off-chain data is required, such as election results, weather forecasts, or the current price of Bitcoin, oracles are responsible for bringing this data into the blockchain. Since off-chain data providers (such as oracle services) are not inherently part of the blockchain network, ensuring the authenticity and integrity of the data becomes a crucial issue. By using signature technology, on-chain smart contracts can verify the trustworthiness of the data source and ensure that the data has not been tampered with during transmission.

We have launched a new Rabin Signature Oracle service: 
https://oracle.urchain.com

This oracle data service uses Rabin signatures to sign timestamps, exchange rates, and Bitcoin market data. It can be applied to smart contract systems based on the Bitcoin UTXO model, such as: 
#NOTE https://NoteProtocol.org 
#CAT20 https://catprotocol.org

In smart contracts, when off-chain data is brought onto the blockchain, the contract uses the public key of the data provider to verify the validity of the Rabin signature. By verifying the signature, the smart contract can confirm the integrity of the data and ensure that it is indeed provided by a trusted oracle.

Compared to other signature algorithms (such as RSA or ECDSA), Rabin signatures offer a simpler verification process, making it suitable for resource-constrained smart contract environments and improving the efficiency of on-chain transaction execution.

One application scenario: Using Rabin signatures to ensure the accuracy of cryptocurrency prices such as Bitcoin and Ethereum, as well as fiat currency exchange rates like JPY and EUR, introduced into the blockchain, thereby validating asset operations.

More about Rabin:
https://en.wikipedia.org/wiki/Rabin_signature_algorithm
https://docs.scrypt.io/tutorials/oracle