{
  "manageEntity": {
    "action": "Save",
    "entityId": "1379425665",
    "entityType": "Track",
    "nonce": "0x43c5a9a3c3a783e7ad45b1e86146ffa67b447eddb7450ced26c3d5924e6f131f",
    "signature": "0x49039a804087307218a32eaf57af89064eeef2eed33073f44f16af9c32b0bdac03b57f1943ccaf67faf39a47fe7e2e0252d29a877f6675bd7521ba2e6c8cc7591c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}