# Essentials

- [IBC (Inter-blockchain Communication)](/docs/essentials/bos-essentials/ibc-inter-blockchain-communication.md)
- [User Guide](/docs/essentials/bos-essentials/ibc-inter-blockchain-communication/user-guide.md)
- [Token Registration and Management](/docs/essentials/bos-essentials/ibc-inter-blockchain-communication/token-registration-and-management.md)
- [ibc\_plugin\_bos](/docs/essentials/bos-essentials/ibc-inter-blockchain-communication/ibc_plugin_bos.md)
- [ibc\_plugin\_eos](/docs/essentials/bos-essentials/ibc-inter-blockchain-communication/ibc_plugin_eos.md)
- [Upgrade IBC with EOSIO v1.8](/docs/essentials/bos-essentials/ibc-inter-blockchain-communication/upgrade-ibc-with-eosio-v1.8.md)
- [ibc.token](/docs/essentials/bos-essentials/ibc-inter-blockchain-communication/ibc.token.md)
- [ibc.chain](/docs/essentials/bos-essentials/ibc-inter-blockchain-communication/ibc.chain.md)
- [3s LIB (Batched Byzantine Tolerance Algorithm)](/docs/essentials/bos-essentials/3s-libs-batched-byzantine-tolerance-algorithm.md)
- [PART I BOS LIB Acceleration Solution: Batch PBFT](/docs/essentials/bos-essentials/3s-libs-batched-byzantine-tolerance-algorithm/part-i-bos-lib-acceleration-solution-batch-pbft.md)
- [PART II BOS Batch-PBFT Upgrade Solution](/docs/essentials/bos-essentials/3s-libs-batched-byzantine-tolerance-algorithm/part-ii-bos-batch-pbft-upgrade-solution.md)
- [Algorithm for improving EOSIO consensus speed based on Batch-PBFT](/docs/essentials/bos-essentials/3s-libs-batched-byzantine-tolerance-algorithm/algorithm-for-improving-eosio-consensus-speed-based-on-batch-pbft.md)