> For the complete documentation index, see [llms.txt](https://docs.bitoftrade.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.bitoftrade.com/for-developers/cross-chain-messaging-protocol/smart-contracts.md).

# Smart contracts

Signers Registry 

<table><thead><tr><th width="184">Chain</th><th>Address</th></tr></thead><tbody><tr><td>Mainnet</td><td><a href="https://etherscan.io/address/0x50dbb856b8f69486fc7e652d101d32b4820a7cb0">0x50dbb856b8f69486fc7e652d101d32b4820a7cb0</a></td></tr><tr><td>Polygon</td><td><a href="https://polygonscan.com/address/0x50dbb856b8f69486fc7e652d101d32b4820a7cb0">0x50dbb856b8f69486fc7e652d101d32b4820a7cb0</a></td></tr><tr><td>BSC</td><td><a href="https://bscscan.com/address/0x50dbb856b8f69486fc7e652d101d32b4820a7cb0">0x50dbb856b8f69486fc7e652d101d32b4820a7cb0</a></td></tr><tr><td>Avalanche</td><td><a href="https://snowtrace.io/address/0x50dbb856b8f69486fc7e652d101d32b4820a7cb0">0x50dbb856b8f69486fc7e652d101d32b4820a7cb0</a></td></tr><tr><td>Fantom</td><td><a href="https://ftmscan.com/address/0x50dbb856b8f69486fc7e652d101d32b4820a7cb0">0x50dbb856b8f69486fc7e652d101d32b4820a7cb0</a></td></tr><tr><td>Arbitrum</td><td><a href="https://arbiscan.io/address/0x50dbb856b8f69486fc7e652d101d32b4820a7cb0">0x50dbb856b8f69486fc7e652d101d32b4820a7cb0</a></td></tr><tr><td>Optimism</td><td><a href="https://optimistic.etherscan.io/address/0x50dbb856b8f69486fc7e652d101d32b4820a7cb0">0x50dbb856b8f69486fc7e652d101d32b4820a7cb0</a></td></tr></tbody></table>