> For the complete documentation index, see [llms.txt](https://satz-one.gitbook.io/satz_docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://satz-one.gitbook.io/satz_docs/sats-infrastructure/sats-nuclei.md).

# Sats Nuclei

This is the heart of the Satschain ecosystem, It provides EVM execution and State storage to the BTC chain. It is responsible for executing the transactions sent to it from the Sats Intel.

As sats nuclei, we are using the custom Besu single node. The modification of Sats Nuclei include the following:<br>

1. Signature algorithm modifications:
   1. Using R-field of the signature as a priority of the transaction in the block.
   2. Using S-field of the signature as the sender’s address.
   3. Extracting address directly from the public key instead of hashing it.

2. Mining at the call of Sats Intel  (to mine blocks once or in bulk) instead of periodic Clique PoA mining, and also allowing Sats Intel to clear the pending transaction from transaction pool.

3. Allowing to mine at most 2 hours into the future, to allow BTC timestamp constraints to pass.


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