{
  "manageEntity": {
    "action": "Save",
    "entityId": "818839545",
    "entityType": "Track",
    "nonce": "0x4ccb54b6d6ca05661aa05de3335a9a6a0cf98288176b213a870a44fc6d49599a",
    "signature": "0x0a16612c4e115bd66d26dff285b0b8b8a634b977416119d2fac12bdb991bf26d48774af99d676559061a894d155a570ea2a896f674f66ced0de952c79f7d6c161c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}