{
  "manageEntity": {
    "action": "Save",
    "entityId": "117421605",
    "entityType": "Track",
    "nonce": "0x251505a1a239ca241f6e21247f786ab34548261d68de0fa5e88a9af350a98f46",
    "signature": "0x9ba99a29d5bcdd485713fcb172630df9d27f8e98336fe54f71ff14e7c51f5344490f27d4a96b88b984afb9ccd02b7f0d6890d2fa28ec1e8ec6d62bfb28eb4c161b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}