{
  "manageEntity": {
    "action": "Save",
    "entityId": "972589145",
    "entityType": "Track",
    "nonce": "0x6aaef0f8a3b0ffe0a8c1dd5cd0143a46bf803090df2fbb7b00eb55bf2c012826",
    "signature": "0x4e65cb70bda5dc21bfc3258e3ca6f23a8a1401dc3b61b37c9da5e68465c64bcc401262a607a7ed1e9dedd461723c04afa99d1e3137598ae1fbd6a4847d747c2d1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}