{
  "manageEntity": {
    "action": "Save",
    "entityId": "407685",
    "entityType": "Track",
    "nonce": "0xd757830f06010ca2b58f75c5d3ee0bd13248d377b9a9ef61e2e57d0f7062baf4",
    "signature": "0xfe9a328135755be7c4dcf33c9a33cc91a68797e03a9f93e3e820dc4972bcde365dd0c9e38d949bba864924518aaca2511d4f66266942e7b0def4df1dcb06f0241b",
    "signer": "0x9FF2A7F5Fab732dA57359bb3eD63a95511bD1329",
    "userId": "67863854"
  }
}