Identity protocol v1: Difference between revisions
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(Specify the usual Bitcoin Hash160(d)) |
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==Creating sacrifice transactions== | ==Creating sacrifice transactions== | ||
An implementation of [https://en.bitcoin.it/wiki/Fidelity_bonds#Announce.2FCommit_Sacrifices Announce/Commit Sacrifices]. That author's feedback on this protocol was very helpful. | |||
# MPK = master public key | # MPK = master public key | ||
# TM = current block height | # TM = current block height | ||
# Create and sign transaction T2. Broadcast if desired. | # Create and sign transaction T2. Broadcast if desired. | ||
## must include OP_RETURN | ## must include OP_RETURN Hash160(MPK) output | ||
## nlocktime = TM + 144 blocks | ## nlocktime = TM + 144 blocks | ||
## no more than 1000 bytes in size | ## no more than 1000 bytes in size | ||
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# Prefix = 0x18 | # Prefix = 0x18 | ||
# SIN_Version = 0x01 | # SIN_Version = 0x01 | ||
# MD = | # MD = Hash160(MPK) | ||
# SIN = base58_encode_check( Prefix + SIN_Version + MD ) | # SIN = base58_encode_check( Prefix + SIN_Version + MD ) | ||
# Hyphenate or space SIN for easier human reading | # Hyphenate or space SIN for easier human reading | ||
Revision as of 05:12, 28 June 2013
Design goals
Decentralized identity.
- Has some creation cost
- Sacrifice may be digitally proven, bootstrapping root of trust from blockchain data
- Start as anonymous; opt out of anonymity by attaching identifying key-value pairs (real.name = "John Smith").
Creating sacrifice transactions
An implementation of Announce/Commit Sacrifices. That author's feedback on this protocol was very helpful.
- MPK = master public key
- TM = current block height
- Create and sign transaction T2. Broadcast if desired.
- must include OP_RETURN Hash160(MPK) output
- nlocktime = TM + 144 blocks
- no more than 1000 bytes in size
- must include >= 0.001 BTC fee
- Create, sign and broadcast transaction T1
- must include OP_RETURN serialized(T2) output
Creating a SIN
A SIN ("System Identification Number") is the unique record identifier by which this identity will be known.
- Prefix = 0x18
- SIN_Version = 0x01
- MD = Hash160(MPK)
- SIN = base58_encode_check( Prefix + SIN_Version + MD )
- Hyphenate or space SIN for easier human reading
Validating the root identity information
- B1 = block w/ T1, B2 = block w/ T2
- Verify B2 height - 144 >= B1 height.
- Verify mined T2 == announced T2
- Fail and waste sacrifice if not.
Thus a minimal root record is MPK and is provably
- linked to the sacrifices
- MPK starts a new chain of digital signature trust, for further record updates
After that, additional key-value pairs may be associated with the root record via updates verified by PPK, stored in an alt-blockchain or DHT somewhere. That is outside the scope of this minimal document.