{
  "manageEntity": {
    "action": "Save",
    "entityId": "413296923",
    "entityType": "Track",
    "nonce": "0x74c474836d2ea19f61c0af4a8d2e42739463677afb3bb1b09e1197d568d0e327",
    "signature": "0x5f7e7951b403e3e79a2854a18cabda860e0228573abeda8aba835894d6abd21833ce7d1c75c68b1d22c7135fd2f7c08b9187532bd78a6d22d3546559d629623c1b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}