{
  "manageEntity": {
    "action": "Save",
    "entityId": "954477",
    "entityType": "Track",
    "nonce": "0xdaa16e337593426d66c7a438d9c703c04533950f7bf4b1da7efef3c1353f6025",
    "signature": "0xb378049a6e9792157a8c6f51cef557ea819ec209352c1b0b7f56cbb2669dfeec3582b48787f101aca1254670238a7a39d10fa3353793155fde345516526d266f1c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}