# Bitcoin Cash Protocol

### About

[Style Guide](/style-guide) — [Contributors](/contributors) — [Target Audience](/target-audience) — [Project History](/project-history)

### Basics
[Overview](/protocol/overview) — [Blockchain Basics](/protocol/blockchain) — [Protocol Hashing Algorithms](/protocol/blockchain/hash) — [Memory Pool](/protocol/blockchain/memory-pool)

### Transactions
[Bitcoin Transaction](/protocol/blockchain/transaction) — [Unlocking Script](/protocol/blockchain/transaction/unlocking-script) — [Locking Script](/protocol/blockchain/transaction/locking-script) — [Transaction Signing](/protocol/blockchain/transaction/transaction-signing)

### Blocks
[Bitcoin Blocks](/protocol/blockchain/block) —
[Block Header](/protocol/blockchain/block/block-header) — [Merkle Tree](/protocol/blockchain/block/merkle-tree) — [Transaction Ordering](/protocol/blockchain/block/transaction-ordering)

### Script (Bitcoin transaction language)
[Script](/protocol/blockchain/script) — [Operation Codes (opcodes)](/protocol/blockchain/script#operation-codes-opcodes)

### Transaction validation
[Transaction Validation](/protocol/blockchain/transaction-validation) —
[Block-Level Validation Rules](/protocol/blockchain/transaction-validation/block-level-validation-rules) — [Network-Level Validation Rules](/protocol/blockchain/transaction-validation/network-level-validation-rules)

### Proof of Work (PoW)
[Proof of Work](/protocol/blockchain/proof-of-work) — [Difficulty Adjustment Algorithm](/protocol/blockchain/proof-of-work/difficulty-adjustment-algorithm) — [Mining](/protocol/blockchain/proof-of-work/mining) — [Stratum Protocol](/mining/stratum-protocol) — [Mining Pools](/mining/mining-pools)

### Addresses
[Address Types](/protocol/blockchain/addresses) — [Base58Check Encoding (legacy)](/protocol/blockchain/encoding/base58check) — [Cashaddr Encoding](/protocol/blockchain/encoding/cashaddr)

### Cryptography
[Bitcoin Keys (Public/Private)](/protocol/blockchain/cryptography/keys) — [Signatures (ECDSA/Schnorr)](/protocol/blockchain/cryptography/signatures) — [Multisignature (M-of-N multisig)](/protocol/blockchain/cryptography/multisignature)

### Network upgrades

**Pre-BCH:** [Bip-9](/protocol/forks/bip-0009) — [Bip-16](/protocol/forks/bip-0016) — [Bip-34](/protocol/forks/bip-0034) — [Bip-37](/protocol/forks/bip-0037) — [Bip-65](/protocol/forks/bip-0065) — [Bip-66](/protocol/forks/bip-0066) — [Bip-68](/protocol/forks/bip-0068) — [Bip-112](/protocol/forks/bip-0112) — [Bip-113](/protocol/forks/bip-0113) — [Bip-133](/protocol/forks/bip-0133) — [Bip-157](/protocol/forks/bip-0157) — [Bip-158](/protocol/forks/bip-0158) — [Bip-159](/protocol/forks/bip-0159)

**2017:** [BCH-UAHF (BUIP-55)](/protocol/forks/bch-uahf) — [HF-20171113](/protocol/forks/hf-20171113)

**2018:** [HF-20180515](/protocol/forks/hf-20180515) — [HF-20181115](/protocol/forks/hf-20181115)

**2019:** [HF-20190515](/protocol/forks/hf-20190515) — [HF-20191115](/protocol/forks/hf-20191115)

**2020:** [HF-20200515](/protocol/forks/hf-20200515) — [HF-20201115](/protocol/forks/hf-20201115)

**2021:** [HF-20210515](/protocol/forks/hf-20210515)

### Network protocol

[Network Messages](/protocol/network/messages) — [Handshake](/protocol/network/node-handshake)

#### Announcement messages

[filteradd](/protocol/network/messages/filteradd) — [filterclear](/protocol/network/messages/filterclear) — [filterload](/protocol/network/messages/filterload) — [inv](/protocol/network/messages/inv)

#### Request messages

[feefilter](/protocol/network/messages/feefilter) — [getaddr](/protocol/network/messages/getaddr) — [getblocks](/protocol/network/messages/getblocks) — [getdata](/protocol/network/messages/getdata) — [getheaders](/protocol/network/messages/getheaders) — [ping](/protocol/network/messages/ping) —
[sendheaders](/protocol/network/messages/sendheaders) — [version](/protocol/network/messages/version)

#### Response messages

[addr](/protocol/network/messages/addr) — [block](/protocol/network/messages/block) — [headers](/protocol/network/messages/headers) — [notfound](/protocol/network/messages/notfound) — [merkleblock](/protocol/network/messages/merkleblock) — [pong](/protocol/network/messages/pong) —
[reject](/protocol/network/messages/reject) — [tx](/protocol/network/messages/tx) — [verack](/protocol/network/messages/verack)

#### Other messages (extensions)

[sendcmpct](/protocol/network/messages/sendcmpct) — [get_xthin](/protocol/network/messages/get_xthin) — [xthinblock](/protocol/network/messages/xthinblock) — [thinblock](/protocol/network/messages/thinblock) — [get_xblocktx](/protocol/network/messages/get_xblocktx) — [xblocktx](/protocol/network/messages/xblocktx) — [xupdate](/protocol/network/messages/xupdate) — [xversion](/protocol/network/messages/xversion) — [xverack](/protocol/network/messages/xverack)

### Simple Payment Verification (SPV)

[SPV](/protocol/spv) — [Bloom Filters](/protocol/spv/bloom-filter)

### Simple Ledger Protocol

[SLP Overview](/protocol/slp) — [GENESIS](/protocol/slp/genesis) — [MINT](/protocol/slp/mint) — [SEND](/protocol/slp/send) — [COMMIT](/protocol/slp/commit)

### Miscellaneous
[Endian](/protocol/misc/endian)