{
  "manageEntity": {
    "action": "Save",
    "entityId": "448123307",
    "entityType": "Track",
    "nonce": "0xe6bfbd1fe3f3ddda8feffbc290c9da3f84ca6d808af0d82b2c43423c62df0a43",
    "signature": "0xa4eb36dd03517953ad62f28bd89090411563f9dcb91a6a96a33ea9c4f496b61b5ca65f4cc26195168647f7d9c316463866b164648a7bd4e673be57caa7f7aad11c",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}