{
  "manageEntity": {
    "action": "Save",
    "entityId": "572419565",
    "entityType": "Track",
    "nonce": "0x4ce0a84f83714e9548185d338d9034e21c0f561c0bc7f9e478bb94ec7c7c69b9",
    "signature": "0x900c1840395b87ec71811ec3ac78a7b9d4d9a1dd3666e1dc4ee0ae1b91c8bf550773948c6c5faa29c0d5804fb0c3e9547f835c02300f0ea4319f3b871ab807be1c",
    "signer": "0x15B9643abE09bd37C52a5BD1dCF938B05b06cBFB",
    "userId": "370091516"
  }
}