{
  "manageEntity": {
    "action": "Save",
    "entityId": "1194979467",
    "entityType": "Track",
    "nonce": "0x75a4ef2505a636ee7323d17af4107343fefe1d185b22bc69b3a86683ab505b55",
    "signature": "0x3fc20ed40bd2484cbbc0ba912c5b3c7012ce8be36dd7f055112fbe04f20aadc162b5e701f8fa2f49c29520592d8f89d69a6417e1f8bad7e6f1ac616b5777510c1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}