{
  "manageEntity": {
    "action": "Save",
    "entityId": "1815616442",
    "entityType": "Track",
    "nonce": "0x03e30dacb06f3940fb1acdafe743ff9d8b3197eb445975f19c51cf0ebd54bd52",
    "signature": "0x35f7202086e32308e588d50e35d9b7b6d3ec2bcce9933be8aff4b120896df60a5b256cdf014f59c400d285b1ca473de442d4b443710a0916e3295750c99bedc81c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}