{
  "manageEntity": {
    "action": "Save",
    "entityId": "1421622783",
    "entityType": "Track",
    "nonce": "0x97aa82042ca051daedb1a14d55a657fe5f16cab9c78b7ecf3500f9c66276b36b",
    "signature": "0x6219e2ca19d9629562835c13694ee55b2284ab3a04f1b13d9642e5997810c758296ac5451acd80d737e70f46225f58b9616eceb1e8d9a198c97c9e0aa611c6411c",
    "signer": "0x9668338741f0B2F3bcc87715a755f7FFACcEd1D6",
    "userId": "945181225"
  }
}