{
  "manageEntity": {
    "action": "Save",
    "entityId": "1221909614",
    "entityType": "Track",
    "nonce": "0xb708137422b2d0995ed473814db531f2b23134355759847ff14c54704d1d4c20",
    "signature": "0x2a7e64e8382fe5ea6fb07b290edb3e79df0ab488087e6821a288a030903640bc49b56060b25c08c23f973991c602fbfb14d95862326fd0175cc7182e8629ecf31b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}