{
  "manageEntity": {
    "action": "Save",
    "entityId": "257386",
    "entityType": "Track",
    "nonce": "0xc7121e7f44d4e65d5b4eda69cd3364016187aa5e2bb2db68c26f821f51f4a75c",
    "signature": "0x62bb36d253a1333dc1ca3b37160fa6f31920f00e88e1ee04849e68c699a5b6e66b141390c1c1a0cfe827f39c1b4b6e377ea57bafbd69ee89fa063e4070b903691c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}