{
  "manageEntity": {
    "action": "Save",
    "entityId": "1551278110",
    "entityType": "Track",
    "nonce": "0x6fa915f1dd862cd378fa52a7f992cc99a2b30f1f4aa85f4e2b653d6389655232",
    "signature": "0x96744524b0a7c29b2ea5a3c1299abb50f14110141d07257e6f48a49ece1682c305790d0a1ff3a055e0eb6eb5b5ac76ad9bb3ff9a96cec9a618b066b44b108da11b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}