{
  "manageEntity": {
    "action": "Save",
    "entityId": "637868579",
    "entityType": "Track",
    "nonce": "0x0e76d3a080aa85cf7094d6968257fc5f73dc72c557b899078b9586a62e0d4b54",
    "signature": "0xde2faaa619bc338db2e61c0512ea553ca012b378316ab3b0597f1f747984a18673a88616e29aaf9cf0217168b62d241cd3bd7d4914aa55486449ce089eb61a9e1c",
    "signer": "0xC35123bF05ca0B3A7B333c53E47bcd9f9DA864d4",
    "userId": "33896318"
  }
}