{
  "manageEntity": {
    "action": "Save",
    "entityId": "1900331319",
    "entityType": "Track",
    "nonce": "0x3fa51ed54532fd3657b89b18c0f623f535766d36ab548e0f27f1555e80b4c2c1",
    "signature": "0x5631d133c88ebe934cfdee2f41636012b7f4b20debdb7aa3c3aa360633e057234035b274cbc2de57482b491251a86d0d7b9a14ff1c2d5a8755d37868c383d62d1c",
    "signer": "0xC35123bF05ca0B3A7B333c53E47bcd9f9DA864d4",
    "userId": "33896318"
  }
}