{
  "manageEntity": {
    "action": "Save",
    "entityId": "1566836542",
    "entityType": "Track",
    "nonce": "0x5e821e5fbc16820555c45f7986de8da016835380718517379765186a14d96e80",
    "signature": "0xd26abe7c8b1d732ebaba2fcf4ad8998b9eb2cfacbc277559ca52344d0c7bc4e85a9e89b4f939c7e736a4533d4c78d45a7717255f5224f837b9c93545344ba5411c",
    "signer": "0x4a57e2DeD165f5711bbB2bFF6253838BcFee1928",
    "userId": "268361684"
  }
}