{
  "manageEntity": {
    "action": "Save",
    "entityId": "904260717",
    "entityType": "Track",
    "nonce": "0xd6a2767e9f9a173e7d0398a4769bc5ff143fea29b88afd434aa2453f09ab271e",
    "signature": "0x50c7cbb8fb5d0219cdbc99cd2305141dc000cf024d8b319d9e2c8b4a249ff1664caea219cd359cd8680899d86783d0d5072559cd58d5aa7ca66ff23c2cc06e791b",
    "signer": "0x4a0f39E85EB30F24A9D6835AE775Ce8462b4f56B",
    "userId": "814438882"
  }
}