ABI Lookup using raw data

Hashes

The raw data of each transaction contains information about the function that is called. The first 10 characters (4 bytes) of this data represent a hash of the function's signature, known as the "method ID".

Emitted events also include this method ID, but in the form of the first topic (topic0) in the event's log data.

Lookup

To decode the original arguments of a function call or event, the ABI (Application Binary Interface) for the function or event must be known. There are two ways to look up the ABI for a given method ID:

b32: This is a specialized collection of method and event ABIs that can be queried by method ID. The lookup is available at

https://b32.vecha.in/q/{{SIGNATURE}}.json

sig.api.vechain.energy: This is a more general lookup proxy that can be used for method IDs that are not found in b32. It will also query public Ethereum databases if no match is found. The lookup is available at

https://sig.api.vechain.energy/{{SIGNATURE}}

See more details on https://sig.api.vechain.energy (opens in a new tab)

Examples

Transaction Example

https://vechainstats.com/transaction/0x8eab357637f65b5db6ce9abe269c7b2de1cbc7d566135cd79df8d626f50cce3c/#clauses (opens in a new tab)

Function Example

The raw data of the first clause is

0xaecb29bf0000000000000000000000000000000000000000000000000000000000000002636e2e762a1dc36d0016729794476dc656182b44bb6ed8d1fcaf11c6098efcaab61ce1c552e7933fc6135387ab6b863d6e4eaff2c4fddec2a7d65363f64543f0

The first 10 characters (4 bytes) represent the method ID:

0xaecb29bf

ABI Lookup links:

• https://b32.vecha.in/q/0xaecb29bf.json (opens in a new tab)
• https://sig.api.vechain.energy/0xaecb29bf (opens in a new tab)
• https://sig.api.vechain.energy/0xaecb29bf0000000000000000000000000000000000000000000000000000000000000002636e2e762a1dc36d0016729794476dc656182b44bb6ed8d1fcaf11c6098efcaab61ce1c552e7933fc6135387ab6b863d6e4eaff2c4fddec2a7d65363f64543f0 (opens in a new tab)

Event Example

The topics of the event log are:

[0] 0xec7c88986ebe0008ab11b3856b7e7963a907c417a7e0362bd682d2c08cb68d69
[1] 0x0000000000000000000000000000000000000000000000000000000000000002
[2] 0x03c98026ce7bf4163ff0e6baf409a11eb84b5e0820efceca8713c1fabd7dcd64
[3] 0x636e2e762a1dc36d0016729794476dc656182b44bb6ed8d1fcaf11c6098efcaa

The first topic, topic0, is the method ID of the event:

0xec7c88986ebe0008ab11b3856b7e7963a907c417a7e0362bd682d2c08cb68d69

ABI Lookup links:

• https://b32.vecha.in/q/0xec7c88986ebe0008ab11b3856b7e7963a907c417a7e0362bd682d2c08cb68d69.json (opens in a new tab)
• https://sig.api.vechain.energy/0xec7c88986ebe0008ab11b3856b7e7963a907c417a7e0362bd682d2c08cb68d69?event=true (opens in a new tab)