Skip to content
Bitcoin library for microcontrollers. Supports Arduino, mbed, bare metal.
C C++
Branch: master
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Type Name Latest commit message Commit time
Failed to load latest commit information.
examples psbt example Jun 28, 2019
src small fixes Nov 16, 2019 rand & docs link Apr 3, 2019
keywords.txt some examples Jun 27, 2019 v0.1.0 Apr 1, 2019


C++ Bitcoin library for microcontrollers. Supports Arduino, ARM mbed, bare metal.
It provides a collection of convenient classes for Bitcoin and general elliptic curve ariphmetics.
This library is built on top of trezor-crypto library. API is inspired by Jimmy's Porgramming Blockchain class and book.


Classes and functions

Key management:


  • PrivateKey - a single private key class. Stores the 32-byte secret and network information (mainnet or testnet). Can be exported / imported as WIF. Inherits functionality from ECScalar - you can add, multiply, divide them, multiply PublicKey by it etc.
  • PublicKey - a single public key class. Inherits functionality from ECPoint class - you can add them, multiply by scalar etc.
  • HDPrivateKey - HD wallet private key with bip32 functionality. For common derivation pathes (bip44/49/84) automatically detects the script types. Can derive children and hardened children, can be derived from mnemonic or seed.
  • HDPublicKey - An HD public key corresponding to a particular HD private key. Can derive children, but not hardened.

Handy functions:

  • generateMnemonic(int strength) - generates a new mnemonic using RNG
  • generateMnemonic(const uint8_t * entropy_data, size_t length) - generates mnemonic from byte array
  • generateMnemonic(const char * entropy_string) - generates mnemonic from the string

Other Bitcoin classes

  • Signature - ECDSA signature
  • Script
  • Witness
  • Tx - transaction class
  • TxIn
  • TxOut

Extra classes:

  • PSBT - partially signed bitcoin transaction (bip174)
  • ElectrumTx - unsigned electrum transaction, poorly implemented, consider using PSBT instead.

Elliptic curve math

  • ECScalar - a 256-bit number modulo N (curve order)
  • ECPoint - a point on an elliptic curve (secp256k1)

Hash functions

Hash functions defined in Hash.h file.

Single line functions:

  • sha256
  • sha256Hmac
  • sha512
  • sha512Hmac
  • rmd160
  • hash160 - rmd160(sha256(m))
  • doubleSha

And corresponding hash classes (with HMAC support):

  • SHA256
  • SHA512
  • RMD160
  • Hash160
  • DoubleSha

Future development


  • external key storage support (i.e. smart cards and chips like ATECC608A)
  • cryptoaccelerators and TRNG support
  • handy functions to construct knowns script - HTLC, multisig, timelocks
  • script evaluation
  • tests (especially on the edge cases)
  • security audit of the code - improve on sidechannels etc
  • micro-python bindings
  • lightning support (probably gonna be a separate library)
  • memory optimizations (internal storage for large transactions to reduce RAM footprint etc)

Classes to be implemented:

  • BlockHeader
  • MerkleProof
You can’t perform that action at this time.