| HardDeriv | Network.Haskoin.Keys, Haskoin |
| HardOrAny | Network.Haskoin.Keys, Haskoin |
| HardPath | Network.Haskoin.Keys, Haskoin |
| hardSubKey | Network.Haskoin.Keys, Haskoin |
| hardSubKeys | Network.Haskoin.Keys, Haskoin |
| hasAnyoneCanPayFlag | Network.Haskoin.Script, Haskoin |
| hasForkIdFlag | Network.Haskoin.Script, Haskoin |
| Hash160 | Network.Haskoin.Crypto, Haskoin |
| hash2 | Network.Haskoin.Block.Merkle |
| Hash256 | Network.Haskoin.Crypto, Haskoin |
| Hash512 | Network.Haskoin.Crypto, Haskoin |
| headChecksum | Network.Haskoin.Network, Haskoin |
| headCmd | Network.Haskoin.Network, Haskoin |
| headerHash | Network.Haskoin.Block, Haskoin |
| HeaderMemory | |
| 1 (Type/Class) | Network.Haskoin.Block.Headers, Network.Haskoin.Block, Haskoin |
| 2 (Data Constructor) | Network.Haskoin.Block.Headers, Network.Haskoin.Block, Haskoin |
| Headers | |
| 1 (Type/Class) | Network.Haskoin.Block, Haskoin |
| 2 (Data Constructor) | Network.Haskoin.Block, Haskoin |
| headersList | Network.Haskoin.Block, Haskoin |
| headerWork | Network.Haskoin.Block.Headers |
| headMagic | Network.Haskoin.Network, Haskoin |
| headPayloadSize | Network.Haskoin.Network, Haskoin |
| hexToBlockHash | Network.Haskoin.Block, Haskoin |
| hexToTxHash | Network.Haskoin.Transaction, Haskoin |
| hmac256 | Network.Haskoin.Crypto, Haskoin |
| hmac512 | Network.Haskoin.Crypto, Haskoin |
| HRP | Network.Haskoin.Address.Bech32 |