{
  "manageEntity": {
    "action": "Save",
    "entityId": "1897144672",
    "entityType": "Track",
    "nonce": "0xebc1dc22b09a5255271c14305cf90ce23779651990d16804b4aed32d8a6f62ed",
    "signature": "0x416e295de5e9382d606cc821c9f01568fa6998c3ea6b60b711cc57523a3c5c9632807970d2a27b7337863a5f8b6ecd4373e01b0b193f3be9e8e652631353118a1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}