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# Bitcoin Cash Protocol
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**About **
[Style Guide ](/style-guide ) — [Contributors ](/contributors ) — [Target Audience ](/target-audience ) — [Project History ](/project-history )
### Basics
[Blockchain basics ](/protocol/blockchain ) — [Protocol hashing algorithms ](/protocol/blockchain/hash ) — Memory Pool
### Transactions
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[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 )
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### 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 Pools
### Addresses
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Pay To Public Key (P2PK) — Pay To Public Key Hash (P2PKH) — Pay To Script Hash (P2SH) — [Base58Check encoding (legacy) ](/protocol/blockchain/encoding/base58check ) — [Cashaddr encoding ](/protocol/blockchain/encoding/cashaddr )
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### Cryptography
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Secp256k1 — Public Key — Private Key — ECDSA signatures — Schnorr signatures — [Multisignature (M-of-N multisig) ](/protocol/blockchain/cryptography/multisignature.md )
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### Network upgrades
[Bip-16 ](/protocol/forks/bip-0016 ) — [Bip-34 ](/protocol/forks/bip-0034 ) — [Bip-37 ](/protocol/forks/bip-0037 ) — [Bip-64 ](/protocol/forks/bip-0064 ) — [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-157 ](/protocol/forks/bip-0157 ) — [Bip-158 ](/protocol/forks/bip-0158 ) — [Bip-159 ](/protocol/forks/bip-0159 ) — BCH-UAHF (BUIP-55) — [HF-20171113 ](/protocol/forks/hf-20171113 ) — HF-20180515 — HF-20181115 — HF-20190515 — HF-20191115
### Network protocol
[Network Messages ](/protocol/network/messages ) — [Handshake ](/protocol/network/node-handshake )
**Announcement messages **
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[filteradd ](/protocol/network/messages/filteradd.md ) — [filterclear ](/protocol/network/messages/filterclear.md ) — [filterload ](/protocol/network/messages/filterload.md ) — [inv ](/protocol/network/messages/inv.md )
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**Request messages **
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feefilter — getaddr — [getblocks ](/protocol/network/messages/getblocks.md ) — [getdata ](/protocol/network/messages/getdata.md ) — [getheaders ](/protocol/network/messages/getheaders.md ) — [ping ](/protocol/network/messages/ping.md ) —
sendheaders — [version ](/protocol/network/messages/version.md )
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**Response messages **
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[addr ](/protocol/network/messages/addr.md ) — block — headers — notfound — [merkleblock ](/protocol/network/messages/merkleblock.md ) — [pong ](/protocol/network/messages/pong.md ) —
[reject ](/protocol/network/messages/reject.md ) — tx — [verack ](/protocol/network/messages/verack.md )
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**Other messages (extensions) **
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sendcmpct — get_xthin — xthinblock — thinblock — get_xblocktx — xblocktx —[xverack ](/protocol/p2p/xverack.md ) — [xversion ](/protocol/p2p/xversion.md )
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### Simple Payment Verification (SPV)
[Bloom Filters ](/objects/bloom__filter )
### Simple Ledger Protocol
### Miscellaneous
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[Endian ](/protocol/misc/endian )
