{
  "manageEntity": {
    "action": "Save",
    "entityId": "398277",
    "entityType": "Track",
    "nonce": "0x1d5a2558635656805e9ac650d16b0e8349bc5a24c680453bfcb66ca94de3a452",
    "signature": "0xba58d77105edb46b19eb461f996647c268906efde8eddacb95f6d8c03cfbd62803c4d3594ca17a4ea3b2ccf8e15d92d9cf38adf7733891c30071c28b44cbb79d1c",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}