{
  "manageEntity": {
    "action": "Save",
    "entityId": "428908707",
    "entityType": "Track",
    "nonce": "0xcd6f25de06c7edb73877362602706a316b66b68fab7b1da9af4e5c48270971bd",
    "signature": "0x0e25201e0a67d115383e07cd4d815971c5adff99de8abcefd674bd104335e94114160e42e93317a35bcd6b5178dea3804a90338d6b8b5eebf271d1c924dcc3791b",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}