{
  "manageEntity": {
    "action": "Save",
    "entityId": "474447",
    "entityType": "Track",
    "nonce": "0x3bdfc0b1332fd2d4645675a58cbe686f0637dedd7a006ef25d374bb76640d9e9",
    "signature": "0xab0e37fc51e5f14de730501ec9de4d93e9c450f09f5fc1e2c680797cb6182fab140e2663aa2a7afbfcb4267feb675004e8c0601292ef20110e15a308683efca41b",
    "signer": "0x2BD0c2111290EB20B2843e8b1c0f25aA5cd52a6f",
    "userId": "618242981"
  }
}