{
  "manageEntity": {
    "action": "Save",
    "entityId": "755489",
    "entityType": "Track",
    "nonce": "0x640823c474ce7220d867e0a3deba02a37780a70f16191c5cd21cd575618125e6",
    "signature": "0x72b5fb691e912229c4cc127e8890164002e6b4cc41ef8cbeac6f961dec1a44f0151c12e961f05719a3057e7c0bacea96444d7403d4c2889d6f05255b9fe5ed371c",
    "signer": "0x59765b22C96E88dA578af23E8611d6ca2dcCd7C9",
    "userId": "377610060"
  }
}