{
  "manageEntity": {
    "action": "Save",
    "entityId": "21014461",
    "entityType": "Track",
    "nonce": "0x4a9e2eaa1bc388dd2062d693fbea1ce87f811c989e8d0de084abe397f8bae7ce",
    "signature": "0x946c220e1c1e752d5943423c8b66bbcdf8da198a59160cd02058eab7f995b1064f1d680cae50367b4d30648d9f933dd25deb347e1e7ad864877573d2bd44192e1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}