{
  "manageEntity": {
    "action": "Save",
    "entityId": "1666222935",
    "entityType": "Track",
    "nonce": "0x3b264cca05472d70309e3177de48b2a0444b255b6cb2c7826c81899a2f5baaab",
    "signature": "0x8855d1590af6d533dffda14f0fd6bccbdb69002cf8551cd3514354a58af923c1659aba72d269db5875f0a18b686e34bd48bee9fb4b2ece525350c5f4da2309091c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}