{
  "manageEntity": {
    "action": "Save",
    "entityId": "659049421",
    "entityType": "Track",
    "nonce": "0xb2ddfb989c4ae0ab7cc8f3e82fa0389c6a4c0700bee6e62f5061c079820cfd44",
    "signature": "0x7d09e9af7ca60e48d288415f74f89d25b883fc3d773c314d0a4f2413881f01f5027a69c81810182dd5d0df9cba378d6d1f86a31b80e6a076c92d17e09795ac421b",
    "signer": "0x7425EdbFdF528603A88c658f4cf8B1396a8a77F5",
    "userId": "406225571"
  }
}