{
  "manageEntity": {
    "action": "Save",
    "entityId": "1357599397",
    "entityType": "Track",
    "nonce": "0x2ee60b7cb4869412b3c0e54daee0256c077960fe77b485d60e1dd63324165e99",
    "signature": "0xfece0763b9b68a0144baa0a1533aec6546bd062d568290f912a51b947c2167952b0e73409eb11bc8cbe7f9c04473eca88fbd9f19d886382bee4e780e4eace27d1b",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}