{
  "manageEntity": {
    "action": "Save",
    "entityId": "697511",
    "entityType": "Track",
    "nonce": "0x7b5a85f394e30481a24f8d81ba0e363dc39194829c6b3a5d443ecbee2e66e063",
    "signature": "0xd4eab3e1cb96465cb950d1ed1d99119beae6d1df20c00592d29cb3263a0881893448fad2d3712baa0647533cce06b42d34303214b8440694c67070a42d51c2d31c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}