{
  "manageEntity": {
    "action": "Save",
    "entityId": "357602076",
    "entityType": "Track",
    "nonce": "0x8c4bd578895b7d3ae5b73fadd6555040ceb2528a4223c6ba57d8087e399f2534",
    "signature": "0x94443f7436893eb42fd80889113444bb324564a9d7fcee1edb02881433fec3fd680c908da7832fe692bc6964772d1372838eab0956c497b9236043b3042f92ab1b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}