{
  "manageEntity": {
    "action": "Save",
    "entityId": "919691340",
    "entityType": "Track",
    "nonce": "0xf850ac90cb08d1915d492604d08dd79f6723ca58c3699dbb9377f3a55830625e",
    "signature": "0x451fffb27286cd0f2f3597c976968a461c7878064f726ef5f11bc2d0853c7b4f38a707b209915319e77892a151ab7e15c99090e6590a4d9366d69d242431214d1b",
    "signer": "0x793bbEFbb3Cf1e6529B90296e502145aCcCDE8d6",
    "userId": "838777725"
  }
}