{
  "manageEntity": {
    "action": "Save",
    "entityId": "355528184",
    "entityType": "Track",
    "nonce": "0x57f99f4679ffccc8c20e83dd24861fffff495fbf2f6f6d2fa7aa20667ce9f3bf",
    "signature": "0xd12aea8d43422cbad03b7d65cff1dd9905df8423ae3cc07276f2e8ca707da894712cea593be36d1cf0e1491b79433f55901f84f0160cd69534fb27b0090e6c261c",
    "signer": "0x48a006fC89FEf065AAB7A5769519625870833CC6",
    "userId": "128172"
  }
}