{
  "manageEntity": {
    "action": "Save",
    "entityId": "720118",
    "entityType": "Track",
    "nonce": "0x8e775abe1013153e42fb8936052e91b2b4fd9a7510ed6d699a574cb996d38753",
    "signature": "0x24e894e909d1fe630bf74729f8878216976035ea3c17c7fe1a74ee164b91e27075dca367f0e429fe607b2005f9cc171c534b7333b8f948baa784bd641b7c2f461c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}