{
  "manageEntity": {
    "action": "Save",
    "entityId": "594775",
    "entityType": "Track",
    "nonce": "0x8b70d05ef728cd217c0d81e9886311e38b9345572ddf9b1d1b18e9115a5446e4",
    "signature": "0x585878104d0871338b157f90b70adec0ad1f27c3e0612339bc8afc76aa154df64faa30ea8d6c133acd7992fb027be77291ac737a390b86f79cddea6a9db89bd61c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}