{
  "manageEntity": {
    "action": "Save",
    "entityId": "1812868384",
    "entityType": "Track",
    "nonce": "0x80a82da0b57e079bd88f70a6a09a4b3023b1ddb67ae4402824c5544b39523a81",
    "signature": "0xfdfb879f6839bd7642b1fa0eee04c1470c6ea0f7aa4471b5d1c85ec2e2f483ed4d5dee0542362b44aacb06eaa859f419b9ad43401efbdefee54ef7f1df9a440c1c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}