{
  "manageEntity": {
    "action": "Save",
    "entityId": "599603",
    "entityType": "Track",
    "nonce": "0x26d9dbdbb040003b7e7db6e354a74b4b4e7caad9145f15bbafe97e7616c06945",
    "signature": "0xa5c174230924b0163741f8bd5534ae003b798f2e936a23c757d5e2096bc1f1266df2ca9744f7cc2d7291f8bedcc3ad2db12332f37021d7c8802e2aff1b1b73bd1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}