| LS | Title | From | To | Approval date |
| SG17-LS4 | LS/r on information about DLT security standardization (SG20-LS27, SG20-LS44, SG20-LS10, SG21-LS52) | SG17 | ISO/IEC JTC1/SC27/WG5; ISO TC 68/SC 2; ISO/IEC JTC1/SC17; ISO TC 307; SG2; SG21; SG11; SG13; SG20; | 2025-04-17 |
| SG20-LS10 | LS on the consent of the draft Recommendation ITU-T Y.4608 (ex Y.IoT-BoT-peer) “Capability and functional architecture of blockchain of things peers” | SG20 | GSMA; ISO TC 307; SG2; SG21; SG13; SG17; | 2025-01-24 |
| SG20-LS44 | LS on initiation of new work item on draft Recommendation ITU-T Y.DIoT-data-space “The architecture of blockchain based distributed infrastructure for trusted data space” | SG20 | ISO TC 307; SG21; SG11; SG13; SG17; | 2025-01-24 |
| SG20-LS27 | LS/r on distributed ledger technology security (reply to SG17-LS163) | SG20 | SG21; SG17; | 2025-01-24 |
| SG21-LS52 | LS on the creation of a new work item F.MDA-RSM "Requirements for sharing management of multimedia data asset" | SG21 | ISO/IEC JTC1/SC42/WG2; SG17; SG20; | 2025-01-24 |
| SG17-LS163 | LS on distributed ledger technology security | SG17 | SG2; SG13; SG21; SG20; | 2024-09-06 |
