{
  "manageEntity": {
    "action": "Save",
    "entityId": "902786764",
    "entityType": "Track",
    "nonce": "0x4f1aaa36e06973f25e1f07b6907910768fe343914cef2e1321a6b2ff79d8b7d4",
    "signature": "0x1d6525a4aeb046a055d6c986827c85a1b8e05410f20d8ad0d38fe682fa7647ae22c7a6b3e6f70fdb6e6af2b9725e7e59af535316d11a8235f3167481cf14636e1b",
    "signer": "0x1d868e2cc29848871636BdCF83a08A975835b6DD",
    "userId": "120328011"
  }
}