{
  "manageEntity": {
    "action": "Save",
    "entityId": "366500792",
    "entityType": "Track",
    "nonce": "0x75c16f215757a3c8828d763fbc3152a8470bc75ca6a642d39d9bca14363e1100",
    "signature": "0xd5a4bc5a45a1c7478d89fcc336d2b81114e4bd913912a1638c8511a06fcd09e91c655c3a34e133dd1171ff9595a4af15cca7d0070a20efb3956bf3a9161c4f311c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}