{
  "manageEntity": {
    "action": "Save",
    "entityId": "1507971219",
    "entityType": "Track",
    "nonce": "0x4bde06c04244a9e1a5e175a16dee6d4ce7a492e750362d781a91d2d43414d368",
    "signature": "0x29f421d1ccb67084856f4130da5100a3c0a91b38a8e0a67aea8ec4151994382c77dd50fdddd18f27aef1cdf4fe709a69527bff3e058a2c6cf93d28255630970c1c",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}