{
  "manageEntity": {
    "action": "Save",
    "entityId": "789130",
    "entityType": "Track",
    "nonce": "0xbbdf6b4753a421c337c3cfb60ee7fa90cf340544ecb3283304cc9a0e4ffdc81e",
    "signature": "0xb05912ee330a8f530401d267c58d5b67e3b4bb3ae824cdfffc538b30063512740b25bc74aaab974ea27a391fb0e51c9dcea0e2c7f1a9da50051fab71052af1261b",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}