{
  "manageEntity": {
    "action": "Save",
    "entityId": "2004174877",
    "entityType": "Track",
    "nonce": "0xe8231601e2f50df31047cb0571c465c427d9149899794f0d90d13c4708b8ef1e",
    "signature": "0x542a58b363bc03b4b3fd02a4ffb7df4fd7f3ea5cad6e6215f220ed659428ccb13c02a9e2d30b01a70f4b99e8f2e9fd995c4673de77de6b3fb76ea825eaceed7b1c",
    "signer": "0x884490CFa947bC5C5d41834F53666866b78D19d6",
    "userId": "475900419"
  }
}