{
  "manageEntity": {
    "action": "Save",
    "entityId": "541212",
    "entityType": "Track",
    "nonce": "0xf5b6c69c36ede727eac81ba99e664267860eaf479bdcec4c1e743a0db2d92d86",
    "signature": "0xd0dec4aceba326783a72359624a74ddcd39e4489dad473442f7c0184308277850ed665a6f0b4eddec2395965247d4673110795a1d08ebc4a9e4c22ad93dac3b81b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}