{
  "manageEntity": {
    "action": "Save",
    "entityId": "1338845697",
    "entityType": "Track",
    "nonce": "0x7f9a5228ace86553e543a4ca56b83fa0392fb99828fd40a591dd9c053a566e48",
    "signature": "0xdbf437fa04791ddd9fe2d608aeacb94e2e894e38f7a7edd92804d9fd305628c84e9284324f5ae37a7492f29b1933940dda1a90cde7b0e6da9c960f90506f3ead1c",
    "signer": "0x8E12224e4dDc1BdfeC3d5Bf01DB7e4Ec17403ABa",
    "userId": "627040654"
  }
}