{
  "manageEntity": {
    "action": "Save",
    "entityId": "145644763",
    "entityType": "Track",
    "nonce": "0x017bbce31887ae2f6f2b19c3325bcff302310152db3279962749d1c3e90df0e1",
    "signature": "0x46a9bc038388791fcd9d26b4a10679167a4b64a215a2f5e44f5b563d012a966a08fd5ebcf1ce6de812921932af62f357950d9240bdb3f5ff670a64080d23342c1c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}