{
  "manageEntity": {
    "action": "Save",
    "entityId": "1456947628",
    "entityType": "Track",
    "nonce": "0x3971789fa750c61ac9940c2ed3fcb814ca138b783b1aaba44c93be4b5f2ffba1",
    "signature": "0x581a7f99a4a12f242ed8268cca8df85003edcf897de036348e62906b665562527e0c96cca745b03f5efd252c6c85c6c198f036e468b3adbedcb46bd2019c98501c",
    "signer": "0x59765b22C96E88dA578af23E8611d6ca2dcCd7C9",
    "userId": "377610060"
  }
}