{
  "manageEntity": {
    "action": "Save",
    "entityId": "451405174",
    "entityType": "Track",
    "nonce": "0x4637f3e93addb2f9a12fe7fffdd56133531b8ab7dd38212665bf0fe82212301a",
    "signature": "0xa4961e1aaa0a0eee5cca9481a3c5ea9cd36da8042860bb2e202ef07718add3476db53ab40cd999a30d36f1e4f7aa9f4c9340acabc795989c6ca267fc67b021631b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}