{
  "manageEntity": {
    "action": "Save",
    "entityId": "699704125",
    "entityType": "Track",
    "nonce": "0x409dd9fabfdcadca63da00b33bbf2dd6bb235a6bd63a29c8689b399a11072092",
    "signature": "0xa4eed7394fb45e93260f9ca3f6cbc09f677c56d3e6df5ddffa978f46ec9f653709f8c34872bf5c185550d589fca9797e2014a0ed5d8a97276c30b5c2dad004201c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}