{
  "manageEntity": {
    "action": "Save",
    "entityId": "403569998",
    "entityType": "Track",
    "nonce": "0x2da7e437649a7eb8a7dca76730172a749e0693bd09ab07b54b35281a3bca9d26",
    "signature": "0xd7fb3998430da01d720c131414475cf9ec08d8d2d91e0093fcae9cef12ac04d54f71cd52785ffd312485109d01ac996edb3cb689a28008931ac9bc90c27dc0d31c",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}