{
  "manageEntity": {
    "action": "Save",
    "entityId": "521978499",
    "entityType": "Track",
    "nonce": "0x17f8f2c31f19703d5c99b2f4975c120367292c017cb3903b7b6965e6d10c4f7e",
    "signature": "0xb7b813b3d7ab4331572a356f775be6288e2ed73ed8ef161e55851ef9eefadaa8694de2392ff7f80dd8070fb1327a0ed22d581832cb756cf949607c46d1e93f461b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}