{
  "manageEntity": {
    "action": "Save",
    "entityId": "619188",
    "entityType": "Track",
    "nonce": "0x2621523bd1e7e16ab6149bcfdd302fa52a049dace41fbf6387909077fb1b9a28",
    "signature": "0x743ea50bc242958582164c75fc2cc541a68cac971160ecc937c681de3a9089516f7af3219e4fc81be5084eea4f952faea3547e3f953984e29e6e18da8671c81e1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}