{
  "manageEntity": {
    "action": "Save",
    "entityId": "571495342",
    "entityType": "Track",
    "nonce": "0x4c46f8f26e9e22755708ecabeb938abf0efc43b79750cb45a52091e072961fca",
    "signature": "0xbba1ef903bd6972d8e079470a49069996b031da03e587fdcf8dedd4fadf06114344806fa57e083c4a120462034d68598813c101077be459b2fa84356191ec80b1c",
    "signer": "0xa4056B7c6a907C6645A1D738ec885c4EadA3502C",
    "userId": "829231031"
  }
}