{
  "manageEntity": {
    "action": "Save",
    "entityId": "307726",
    "entityType": "Track",
    "nonce": "0x44b5a2cf1af2acd0858ac28ee9b94de9901a7afe226864703998dbcd0bcc6a79",
    "signature": "0x5aa9dd79af01add33ff72f897d8cef8eb9ede23252cb9372660d38008a1a5a24701e76f1aeaa456fdbd188ac06419909d56e1f135d88f1a6296d5d23ba8ff7fe1c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}