{
  "manageEntity": {
    "action": "Save",
    "entityId": "1450259508",
    "entityType": "Track",
    "nonce": "0x4a0b1e17e07ee5a018151a3fe6e104978a94901f143cd6f2f90084d1aa315a0a",
    "signature": "0x41d3dc8ef7935838598a943d40b5d6aceb20f28141bfd091cde6ea88f44841b0361bbe3ea1f5fa583c5a6a0adb7ac569e84af0bf59d92d3cbf4f1a9340254ca41c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}