Hierarchical SINs

[ryanxcharles]

A proof-of-concept of hierarchical SINs. Here's an example of how to use it to derive any SIN in the hierarchy:

> var hsin = bitauth.genHSin();
undefined
> bitauth.hSin(hsin.hsinpriv, 'm/0');
{ hsinpriv: 'xprv9v54hVAqMx9wGiJKgdHEhodP3kGTdFxETu7yd8xDZCzkK6Gm7ax1vYU8qgSJtbH9bsp3u9q3FXpRFVR7p9WT9W5jxGaVmCGPXPEiRwxPrSq',
  SIN: 'TfFs1TcjnkUcUso7TFRUmbKf4h64acJsXLs' }
> bitauth.hSin(hsin.hsinpriv, 'm/1');
{ hsinpriv: 'xprv9v54hVAqMx9wKCrhxNUaQ24ESQ2Kindf2LiE2TkY4k9XFgAmuudRHppf6o8ccCVArmGE7sJoGe26wRG2FLWJRiQBzZqnnkEAkRaDM7j6ZnT',
  SIN: 'TfHMPG1NHydRNVwdP1gBHLdMKxitR1U1NJ5' }
> bitauth.hSin(hsin.hsinpriv, 'm/1/5');
{ hsinpriv: 'xprv9xNv8zzXaSNYAePsB3UU1Nhm423bSsmTRtPcdBmJ2B8rdHv5kSZGmePCYJMjopz2qdR2bmhsvadhmG1BBm36xk5m5U4zKicmtTDvTkmsCbH',
  SIN: 'Tf5PZxnPSBnzThnBbUX1dvhP2Ao28C4wYB8' }
> bitauth.hSin(hsin.hsinpriv, 'm/1/5/30');
{ hsinpriv: 'xprv9yJ7WJ7Gtd49kU6eaZ3gMkGppNFWGTeVhVdjgM8V7GwxZRxf54Hj5HoCYfXm8RfLcjdkFgsmJCyz2dwhytChCFihBnzo8pHg83KhvDJ3krk',
  SIN: 'TfJW9ey44uY7R6EKqfdpWnCNU7NMS1RiVFM' }
> bitauth.hSin(hsin.hsinpriv, 'm/1/5/35');
{ hsinpriv: 'xprv9yJ7WJ7Gtd49ytWE3JpPNmbhLkWPG6awQp8iX6h9F8CYJtsYARTpcNuvDR8qnbK2HXKBRFf8NSHxzo8URukhZQiZvYu7VdkUN7vYE7eEZSa',
  SIN: 'Tf9r9rVLBiQqpkoyitCmfhmfquXEJzE6KYm' }
> bitauth.hSin(hsin.hsinpriv, 'm/1/5/35/4000');
{ hsinpriv: 'xprvA1Y6amBTTmmGqLjaZewvpZNDMrjPCGNkv3DQHXP3RRW5AYSkGAnd36fdco98YtFVbff51y8TjSf33HfsDqiNQsmjBGBkMfToN3YJ2ioX7sB',
  SIN: 'Tf4owKM624toBTbaM8Ghq1BCzREewft8dEr' }

Addresses #5

[levino]

What is a "SIN"?

[xcthulhu]

@levino : System Identification Number ; it's a hashed public key with a checksum to help with detecting copy-errors. It's a BitCoin innovation.

@ryanxcharles : Does this conform to Armory's HD-Wallet system? Because while I'm all for this, I'd rather we just hug the industry standards as best we can...

[levino]

Please close this PR.

[martindale]

...or update it.

[martindale]

Abandoned?