{
  "manageEntity": {
    "action": "Save",
    "entityId": "1015975830",
    "entityType": "Track",
    "nonce": "0x86c3810da5225282ce7349284713904dc6de04f6f647bf16512daf412b0cdcdb",
    "signature": "0xa082c517f811563220954fac7ea7be1614d1bcc4689473306c7d8ba4c361112f462c35aa2a5d22622d513df4881da5bd0ccf66485e195bd1949ab2ba699eddde1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}