ECIP 1082: Fork identifier (`forkid`) protocol fork list specification
| Author | Mr. Meows D. Bits |
|---|---|
| Discussions-To | https://github.com/ethereumclassic/ECIPs/issues/294 |
| Status | Superseded |
| Type | Standards Track |
| Category | Networking |
| Created | 2019-12-18 |
| Superseded by | 1091 |
Abstract
EIP-2124 (forkid) and EIP-2364 (eth/64) propose discovery protocol modifications which depend on lists of fork values. In case these changes are adopted and implemented on Ethereum Classic networks, this ECIP defines canonical lists of forks numbers for inclusion in the generation and validation steps of these “ForkID” schemes.
- https://eips.ethereum.org/EIPS/eip-2124
- https://eips.ethereum.org/EIPS/eip-2364
This specification describes a set of forks which exclude TheDAO fork event block(s) from forkid calculations, as well as excluding all forthcoming blockNumber % 5000000 == 0 blocks that, according to the algorithmdescribed in ECIP-1017 and enabled on ETC Mainnet and some testnets, will see reduced block reward values.
Motivation
Specify parameters for forkid generation and validation, so that in the case nodes on Ethereum Classic networks implement eth/64, they can do so in a consistent way.
As documented in EIP-2364, implementation for eth/64 does not demand consensus nor require any fork for node or network implementation.
Notwithstanding, it would be good for Ethereum Classic networks and clients to be able to implement the protocol change, if they want, according to a standard specification. Failure for clients to agree on forkid implementation could result in difficulty discovering each other.
Specification
Generally
Don’t include TheDAO fork blocks (eg. 1920000 on Mainnet, 1885000 on Morden) as a forkid parameter as specified in EIP-2124.
Don’t include any blocks subsequent and incidental to consensus-facing calculations according to accepted and implemented algorithms, eg. ECIP-1017.
Applied
The following data points are valid at time of writing (see ECIP’s created-at metadata).
Ethereum Classic Mainnet (ETC)
- Genesis Hash:
0xd4e56740f876aef8c010b86a40d5f56745a118d0906a34e69aec8c0db1cb8fa3 - Forks:
1150000,2500000,3000000,5000000,5900000,8772000,9573000,10500839
| Head Block Number | FORK_HASH |
FORK_NEXT |
RLP Encoded (Hex) |
|---|---|---|---|
| head=0 | FORK_HASH=fc64ec04 | FORK_NEXT=1150000 | c984fc64ec0483118c30 |
| head=1149999 | FORK_HASH=fc64ec04 | FORK_NEXT=1150000 | c984fc64ec0483118c30 |
| head=1150000 | FORK_HASH=97c2c34c | FORK_NEXT=2500000 | c98497c2c34c832625a0 |
| head=1150001 | FORK_HASH=97c2c34c | FORK_NEXT=2500000 | c98497c2c34c832625a0 |
| head=2499999 | FORK_HASH=97c2c34c | FORK_NEXT=2500000 | c98497c2c34c832625a0 |
| head=2500000 | FORK_HASH=db06803f | FORK_NEXT=3000000 | c984db06803f832dc6c0 |
| head=2500001 | FORK_HASH=db06803f | FORK_NEXT=3000000 | c984db06803f832dc6c0 |
| head=2999999 | FORK_HASH=db06803f | FORK_NEXT=3000000 | c984db06803f832dc6c0 |
| head=3000000 | FORK_HASH=aff4bed4 | FORK_NEXT=5000000 | c984aff4bed4834c4b40 |
| head=3000001 | FORK_HASH=aff4bed4 | FORK_NEXT=5000000 | c984aff4bed4834c4b40 |
| head=4999999 | FORK_HASH=aff4bed4 | FORK_NEXT=5000000 | c984aff4bed4834c4b40 |
| head=5000000 | FORK_HASH=f79a63c0 | FORK_NEXT=5900000 | c984f79a63c0835a06e0 |
| head=5000001 | FORK_HASH=f79a63c0 | FORK_NEXT=5900000 | c984f79a63c0835a06e0 |
| head=5899999 | FORK_HASH=f79a63c0 | FORK_NEXT=5900000 | c984f79a63c0835a06e0 |
| head=5900000 | FORK_HASH=744899d6 | FORK_NEXT=8772000 | c984744899d68385d9a0 |
| head=5900001 | FORK_HASH=744899d6 | FORK_NEXT=8772000 | c984744899d68385d9a0 |
| head=8771999 | FORK_HASH=744899d6 | FORK_NEXT=8772000 | c984744899d68385d9a0 |
| head=8772000 | FORK_HASH=518b59c6 | FORK_NEXT=9573000 | c984518b59c683921288 |
| head=8772001 | FORK_HASH=518b59c6 | FORK_NEXT=9573000 | c984518b59c683921288 |
| head=9572999 | FORK_HASH=518b59c6 | FORK_NEXT=9573000 | c984518b59c683921288 |
| head=9573000 | FORK_HASH=7ba22882 | FORK_NEXT=10500839 | c9847ba2288283a03ae7 |
| head=9573001 | FORK_HASH=7ba22882 | FORK_NEXT=10500839 | c9847ba2288283a03ae7 |
| head=10500838 | FORK_HASH=7ba22882 | FORK_NEXT=10500839 | c9847ba2288283a03ae7 |
| head=10500839 | FORK_HASH=9007bfcc | FORK_NEXT=0 | c6849007bfcc80 |
| head=10500840 | FORK_HASH=9007bfcc | FORK_NEXT=0 | c6849007bfcc80 |
Kotti
- Genesis Hash:
0x14c2283285a88fe5fce9bf5c573ab03d6616695d717b12a127188bcacfc743c4 - Forks:
716617,1705549,2000000,2200013,5000000
| Head Block Number | FORK_HASH |
FORK_NEXT |
RLP Encoded (Hex) |
|---|---|---|---|
| head=0 | FORK_HASH=0550152e | FORK_NEXT=716617 | c9840550152e830aef49 |
| head=716616 | FORK_HASH=0550152e | FORK_NEXT=716617 | c9840550152e830aef49 |
| head=716617 | FORK_HASH=a3270822 | FORK_NEXT=1705549 | c984a3270822831a064d |
| head=716618 | FORK_HASH=a3270822 | FORK_NEXT=1705549 | c984a3270822831a064d |
| head=1705548 | FORK_HASH=a3270822 | FORK_NEXT=1705549 | c984a3270822831a064d |
| head=1705549 | FORK_HASH=8f3698e0 | FORK_NEXT=2000000 | c9848f3698e0831e8480 |
| head=1705550 | FORK_HASH=8f3698e0 | FORK_NEXT=2000000 | c9848f3698e0831e8480 |
| head=1999999 | FORK_HASH=8f3698e0 | FORK_NEXT=2000000 | c9848f3698e0831e8480 |
| head=2000000 | FORK_HASH=7faf51b5 | FORK_NEXT=2200013 | c9847faf51b5832191cd |
| head=2000001 | FORK_HASH=7faf51b5 | FORK_NEXT=2200013 | c9847faf51b5832191cd |
| head=2200012 | FORK_HASH=7faf51b5 | FORK_NEXT=2200013 | c9847faf51b5832191cd |
| head=2200013 | FORK_HASH=595e180d | FORK_NEXT=5000000 | c984595e180d834c4b40 |
| head=2200014 | FORK_HASH=595e180d | FORK_NEXT=5000000 | c984595e180d834c4b40 |
| head=4999999 | FORK_HASH=595e180d | FORK_NEXT=5000000 | c984595e180d834c4b40 |
| head=5000000 | FORK_HASH=b5407fd6 | FORK_NEXT=0 | c684b5407fd680 |
| head=5000001 | FORK_HASH=b5407fd6 | FORK_NEXT=0 | c684b5407fd680 |
Mordor
- Genesis Hash:
0xa68ebde7932eccb177d38d55dcc6461a019dd795a681e59b5a3e4f3a7259a3f1 - Forks:
301243,999983
| Head Block Number | FORK_HASH |
FORK_NEXT |
RLP Encoded (Hex) |
|---|---|---|---|
| head=0 | FORK_HASH=175782aa | FORK_NEXT=301243 | c984175782aa830498bb |
| head=301242 | FORK_HASH=175782aa | FORK_NEXT=301243 | c984175782aa830498bb |
| head=301243 | FORK_HASH=604f6ee1 | FORK_NEXT=999983 | c984604f6ee1830f422f |
| head=301244 | FORK_HASH=604f6ee1 | FORK_NEXT=999983 | c984604f6ee1830f422f |
| head=999982 | FORK_HASH=604f6ee1 | FORK_NEXT=999983 | c984604f6ee1830f422f |
| head=999983 | FORK_HASH=f42f5539 | FORK_NEXT=0 | c684f42f553980 |
| head=999984 | FORK_HASH=f42f5539 | FORK_NEXT=0 | c684f42f553980 |
Morden
- Genesis Hash:
0x0cd786a2425d16f152c658316c423e6ce1181e15c3295826d7c9904cba9ce303 - Forks:
494000,1783000,1915000,2000000,2300000,4729274,5000381
| Head Block Number | FORK_HASH |
FORK_NEXT |
RLP Encoded (Hex) |
|---|---|---|---|
| head=0 | FORK_HASH=417adbe7 | FORK_NEXT=494000 | c984417adbe7830789b0 |
| head=493999 | FORK_HASH=417adbe7 | FORK_NEXT=494000 | c984417adbe7830789b0 |
| head=494000 | FORK_HASH=aeb67dfb | FORK_NEXT=1783000 | c984aeb67dfb831b34d8 |
| head=494001 | FORK_HASH=aeb67dfb | FORK_NEXT=1783000 | c984aeb67dfb831b34d8 |
| head=1782999 | FORK_HASH=aeb67dfb | FORK_NEXT=1783000 | c984aeb67dfb831b34d8 |
| head=1783000 | FORK_HASH=6a495281 | FORK_NEXT=1915000 | c9846a495281831d3878 |
| head=1783001 | FORK_HASH=6a495281 | FORK_NEXT=1915000 | c9846a495281831d3878 |
| head=1914999 | FORK_HASH=6a495281 | FORK_NEXT=1915000 | c9846a495281831d3878 |
| head=1915000 | FORK_HASH=e893e32d | FORK_NEXT=2000000 | c984e893e32d831e8480 |
| head=1915001 | FORK_HASH=e893e32d | FORK_NEXT=2000000 | c984e893e32d831e8480 |
| head=1999999 | FORK_HASH=e893e32d | FORK_NEXT=2000000 | c984e893e32d831e8480 |
| head=2000000 | FORK_HASH=12a0ac82 | FORK_NEXT=2300000 | c98412a0ac8283231860 |
| head=2000001 | FORK_HASH=12a0ac82 | FORK_NEXT=2300000 | c98412a0ac8283231860 |
| head=2299999 | FORK_HASH=12a0ac82 | FORK_NEXT=2300000 | c98412a0ac8283231860 |
| head=2300000 | FORK_HASH=02a93060 | FORK_NEXT=4729274 | c98402a93060834829ba |
| head=2300001 | FORK_HASH=02a93060 | FORK_NEXT=4729274 | c98402a93060834829ba |
| head=4729273 | FORK_HASH=02a93060 | FORK_NEXT=4729274 | c98402a93060834829ba |
| head=4729274 | FORK_HASH=4802d0c7 | FORK_NEXT=5000381 | c9844802d0c7834c4cbd |
| head=4729275 | FORK_HASH=4802d0c7 | FORK_NEXT=5000381 | c9844802d0c7834c4cbd |
| head=5000380 | FORK_HASH=4802d0c7 | FORK_NEXT=5000381 | c9844802d0c7834c4cbd |
| head=5000381 | FORK_HASH=0b559b1d | FORK_NEXT=0 | c6840b559b1d80 |
| head=5000382 | FORK_HASH=0b559b1d | FORK_NEXT=0 | c6840b559b1d80 |
Rationale
The Ethereum Classic consensus protocol did not fork at block 1920000.
The Ethereum Classic disinflationary monetary policy is not considered a series of forks, it is the natural “stepping” behavior of a deterministic algorithm.
Implementation
Respective reference implementations for forkid generation are documented in EIP-2124 and EIP-2364.