{
  "manageEntity": {
    "action": "Save",
    "entityId": "1199589850",
    "entityType": "Track",
    "nonce": "0x9c0d0b973370bfc43d00053d8328a1508b0caab8ee2e5e1749563ce22bc0af47",
    "signature": "0xe303c6bd1f71a0938c0ed5a4b4156de62d0c42da60d8b1b0dcf4045ddc28102e7e4fc60ee6164e115337b95b10e64a8ffb9f8afe45ed0ad4805b3f059f7a883e1b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}