{
  "manageEntity": {
    "action": "Save",
    "entityId": "857738269",
    "entityType": "Track",
    "nonce": "0x9e16b17d6956d31f088acb6e863daa84bcf8c7815016ea6b5c3af19e72219926",
    "signature": "0x3a77fdda6e78622cc9254113e44590832ede5bb2805a36eb92813ab6886b82c45014fcfd259e34fb11c04954ecd6b88fb07a6298b47dca9b2139596da00fa4211c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}