This Recommendation presents an analysis of the motivations and scenarios of blockchain used in the Next Generation Network Evolution (NGNe). The general high-level requirements of blockchain in NGNe are put forward. Detailed descriptions of the use cases are listed in the appendix. This Recommendation provides the framework of the blockchain for NGNe and specifies the capability requirements that meet the needs of Next Generation Network (NGN) and the blockchain framework. The framework provided in this Recommendation is intended for NGNe as defined in Recommendation ITU-T Y.2340, however, it could be applied as appropriate to other types of telecom networks (e.g. IMT-2020 and Future Network).