{
  "manageEntity": {
    "action": "Save",
    "entityId": "1343921215",
    "entityType": "Track",
    "nonce": "0xd5750b962f51ef83e7f3003f93a16b6246d535f5e0a4ce5dd0f0baf8f8d41faa",
    "signature": "0xb51ee87c9e90d7e278cd496b68e4a2135d9d12420747c11fba49d9f36a653c0d7d3e8f01e867c4b26705aca4317c3e310da086d0545891507524d94676b181d51b",
    "signer": "0x204E506f1D5498d2CABD41d2fc7a3078d5792835",
    "userId": "768479471"
  }
}