{
  "manageEntity": {
    "action": "Save",
    "entityId": "931500870",
    "entityType": "Track",
    "nonce": "0x0c7ec91d5e2aa3661a6da7ae327f2679d8ddb02a9d73be370717d1eb8287b78e",
    "signature": "0x4547d11cf7f1d5b516cfa3429e7f261cf279ad112fb6244c162acc49f7a7acd042f2eeaf7e2cb57181122951a7e9651cb2190a180d66b6cb9963f68e6159b5931b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}