{
  "manageEntity": {
    "action": "Save",
    "entityId": "1072490672",
    "entityType": "Track",
    "nonce": "0xc181a035383de1de6d1482eaed7d108d7c52ac46dd00b877a0ca7a9f1f4a0e6e",
    "signature": "0x7eb5d4a64bf49af5fc46551c7fe88f698ed16423a4fb6fb5a7fde1e94c18b0952248ff49963d260353439987e4bc7649c2ec1acf0ae8f37ba9e96fb3f16fff481c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}