{
  "manageEntity": {
    "action": "Save",
    "entityId": "319575",
    "entityType": "Track",
    "nonce": "0x47a114e7339e45f363d4ca821a0697a422773cba5e3af312b8642d99625a162a",
    "signature": "0x9b1edecbd194b64884bf7130f7050ba3e216423f189605e60443dffcedc1bb396c036f6cf2ba33a3ae90ce3304fa13c029b040eb8a5cbcd2d4721c68f322f6b91c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}