GITBOOK-287: Fix contract links

Author: kenrogers

concepts/sbtc/clarity-contracts/README.md

@@ -1,12 +1,12 @@
 # Clarity Contracts
 
-### Deployed Testnet Contracts
+### Deployed Mainnet Contracts
 
-* [sbtc-registry](https://explorer.hiro.so/txid/0xfa96a73673a97e803c7c1039f9bcf290d9727b0dfaa990f8e52fd81448bb4d09?chain=testnet)
-* [sbtc-token](https://explorer.hiro.so/txid/0x6b42a28d249045fc710a83c7cb542e73688f3e16c5b1bdb0be896f33388365f1?chain=testnet)
-* [sbtc-deposit](https://explorer.hiro.so/txid/0xa9cfdfafd575f2594e20d39c604ff54e2fc50cfb09024c90dbedcedae5b963ba?chain=testnet)
-* [sbtc-withdrawal](https://explorer.hiro.so/txid/0x9699d61100efb8c127674830cf65c3bb44b4497700a59a2688bb3cc2c52297eb?chain=testnet)
-* [sbtc-bootstrap signers](https://explorer.hiro.so/txid/0x15ef8164c493401109b75a654cbd1c3a2a4780ae061e510e52e47bd7863d5c53?chain=testnet)
+* [sbtc-token](https://explorer.hiro.so/txid/SM3VDXK3WZZSA84XXFKAFAF15NNZX32CTSG82JFQ4.sbtc-token?chain=mainnet)
+* [sbtc-registry](https://explorer.hiro.so/txid/SM3VDXK3WZZSA84XXFKAFAF15NNZX32CTSG82JFQ4.sbtc-registry?chain=mainnet)
+* [sbtc-deposit](https://explorer.hiro.so/txid/SM3VDXK3WZZSA84XXFKAFAF15NNZX32CTSG82JFQ4.sbtc-deposit?chain=mainnet)
+* [sbtc-withdrawal](https://explorer.hiro.so/txid/SM3VDXK3WZZSA84XXFKAFAF15NNZX32CTSG82JFQ4.sbtc-withdrawal?chain=mainnet)
+* [sbtc-bootstrap-signers](https://explorer.hiro.so/txid/SM3VDXK3WZZSA84XXFKAFAF15NNZX32CTSG82JFQ4.sbtc-bootstrap-signers?chain=mainnet)
 
 This graph summarizes the overall of the Clarity portion of the sBTC protocol.