{
  "manageEntity": {
    "action": "Save",
    "entityId": "1649632770",
    "entityType": "Track",
    "nonce": "0x3d250957ab834b719e2eeef6c94e07b03592d7334cd417131ba825e3dd9bc5e9",
    "signature": "0x4a564d9ec5c218a7ba0630a204b530d0624fa9852d2a24f2d096a8eeb80bef193eade17e4f0f4652d08024936b2fdae5e29dbe12b41ab60b30e8585e2e47db6f1c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}