{
  "manageEntity": {
    "action": "Save",
    "entityId": "840341833",
    "entityType": "Track",
    "nonce": "0xca3e84d8b48c0c08ae89be55d0a5b29e51d73f5ca20dce94a78f8f3dad7789f0",
    "signature": "0x8fe907ace481da09eb0de2eb3dc48f5c7f8e2f4a2ab95f97e43474240d0f1aae13bada11417f68c498615d5eb4f3d089b149fe1dbeada463151b03859bc00de71c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}