{
  "manageEntity": {
    "action": "Save",
    "entityId": "390022736",
    "entityType": "Track",
    "nonce": "0x978dc5a65494663cfb6f7c2cebff813f24197a0d7a00506ce52bb3371986a4d3",
    "signature": "0x6fc23eaa023792028919e6b04b82ffc208fa13ae94aa2f81f99d6af4ecc8b6720e66f69c09eb50c6436d37a8fac13ae2bd3f4bf2bcdb4c862e4de433036073031c",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}