0xE19CF

0xE19CF is a hexadecimal identifier that has been used in several Ethereum-based smart contract environments to denote a specific token type, a non-fungible artifact, and as a signature prefix in a limited set of decentralized applications. The short code made its first appearance in early 2020 as an experimental project commissioned by the Ethereum Foundation for an up‑gradable token standard, where it served as a placeholder for a global counter used in on‑chain governance proposals.

In its native form, 0xE19CF represents the decimal value 912459, and because it occupies only 15 bits of a 256‑bit word, it is often stored in the first bytes of a contract’s storage layout. Developers use it mainly to demarcate a specific data bucket, enabling efficient look‑ups of user balances and metadata. The identifier is also employed as a prefix in the ECDSA signing scheme that allows certain transactions to be authenticated without revealing signatory keys, a feature that gained traction in layer‑2 roll‑ups that require low‑latency verification.

The portability of 0xE19CF across multiple blockchains has been tested by the Polygon and BSC projects, where it functions as a bridging relay address. Many dev‑tooling libraries expose the identifier as a constant in their JavaScript SDKs, ensuring that it can be referenced programmatically across diverse development tools. Because its implementation is simple, it has also been adopted by academic research projects exploring deterministic state compression for layer‑one consensus.

While 0xE19CF remains a niche identifier, its use illustrates practical strategies for embedding operation codes within contract state, and it is frequently cited in whitepapers that analyze token lifecycle management in smart contracts.