btctools.org
ECC, ECDSA and other cryptographic tools
Generate Private Key
Generate Public Key
Point Multiplication
ECDSA Sign
ECDSA Verify
Hash
Decompress Public Key
Bitcoin tools
Generate Bitcoin Address
Create Transaction
Parse Transaction
Broadcast Transaction
Parse Block
Build Block
Bitcoin Message Sign
Bitcoin Message Verify
Opcodes
Encoding and conversion tools
hex/bin/dec conversion
DER Encode
WIF Encode
Base58 Encode
CompactSize Encode